A00000070458psd.png
modbus_vektor_logo_01ai.png

Bus interface Modbus RTU

BM0_Bacnetjpg.jpg

Bus interface BACnet MS/TP

BM0_MP-Buspng.png

Bus interface MP-Bus

A00000070458psd.png
modbus_vektor_logo_01ai.png
BM0_Bacnetjpg.jpg
BM0_MP-Buspng.png

BM0

Control component with dynamic transducer and choice of bus interface: Modbus RTU, BACnet MS/TP or MP bus

Compact unit for VAV terminal unit TVR, TVJ, TVT, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVM

  • Controller, dynamic differential pressure transducer and actuator in one casing
  • Use in ventilation and air conditioning systems, only with clean air
  • Volume flow rates qvmin and qvmax are pre-set in the factory and saved in the controller as changed parameters
  • High data transparency through standardised bus communication Modbus RTU, BACnet MS/TP and MP bus 
  • Setpoint value settings, override controls, parameter adjustment via bus communication
  • Service access for manual adjustment devices and PC configuration software

 


General information


Application

  • All-in-one control devices for VAV terminal units
  • Dynamic differential pressure transducer, electronic controller, and actuator are fitted together in one casing
  • Choice of various control options based on setpoint value default setting
  • Volume flow rate control is based on setpoint values received from room temperature controller, central BMS, air quality controller or other devices as an analogue signal or via communication interface
  • Override controls for activating qvmin, qvmax, shut-off or OPEN position can be set with a switch or relay or in the Modbus/BACnet register
  • The volume flow rate actual value is available as a network data point or as a linear voltage signal
  • The damper blade position is available as a network data point
  • Standard filtration in comfort conditioning systems allows for use of the controller in the supply air without additional dust protection
  • The ZTH EU service tool and PC-Tool can be used to configure the controller and the communication parameters

With heavy dust levels in the room

  • Install suitable extract air filters upstream, as a partial volume flow is routed through the transducer for volume flow rate measurement

If the air is contaminated with dust, fluff or sticky particles

  • Use a control component with static differential pressure transducer, e.g. BUSN




Control strategy

  • The volume flow controller works independently of the duct pressure
  • Differential pressure fluctuations do not result in permanent volume flow rate changes
  • To prevent the control from becoming unstable, a dead band is allowed within which the damper blade does not move.
  • Flow rate range parameterised in the controller at the factory (qvmin: minimum volume flow rate, qvmax: maximum volume flow rate)
  • Operating parameters are specified via the order code and parameterised in the factory




Operating modes


  • Variable operation (V): setpoint value setting via Modbus




Interface

Communication interface

  • Modbus RTU, RS485 (factory setting)
  • BACnet MS/TP, RS485
  • MP bus
  • Data points, see bus lists

Alternatively

  • Analogue interface with adjustable signal voltage range
  • Analogue signal for volume flow rate setpoint value
  • Analogue signal for volume flow rate actual value (factory setting)

Note

  • The interface type is factory set
  • Can be changed with service tools (by others)




Signal voltage ranges

When using the analogue interface (can be set with service tools)

  • 0 – 10 V DC
  • 2 – 10 V DC




Parts and characteristics

  • Transducer for dynamic pressure measurements
  • Overload protection
  • Controller with factory fitted connecting cable
  • Service interface for the connection of service tools
  • Clamping device
  • Indicator lights for indicating the operating mode
  • Supply voltage and communication not galvanically isolated




Operating parameters


  • qvmin = 0 – 100 % of the nominal volume flow rate qvnom adjustable
  • qvmax = 20 – 100 % of the nominal volume flow rate qvnom adjustable




Construction

Type LMV-D3-M/B TR for volume flow controllers

  • TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVM

Type NMV-D3-M/B TR for volume flow controllers

  • TVJ
  • TVT up to 1000 × 300 or 800 × 400 mm

Type SMV-D3-M/B TR for volume flow controllers

  • TVT from 900 × 400 mm




Commissioning

  • As the volume flow rates are factory set, the terminal units have to be installed at the specified locations
  • Analogue interface: analogue signalling to be set with PC-Tool (by others)
  • Modbus/BACnet/MP bus interface: additional commissioning steps may be required
  • Operating parameters can be adjusted with service tools (by others)




Useful additions

Service tools:

  • Adjustment device ZTH-EU (order code AT-VAV-B)
  • PC-Tool software


Information technique

Function, Specification text, Order code

  • Function
  • SPECIFICATION TEXT
  • ORDER CODE
      Principle of operation Funktionsgrafik_BM0ai.png

① Effective pressure transducer

② Actuator

③ Volume flow controller

④ Setpoint value signal

 

VAV terminal units control the volume flow in a closed loop, i.e. measurement – comparison – correction.
For volume flow rate measurement the effective pressure is measured first. This is done with a differential pressure sensor. The integral differential pressure transducer transforms the effective pressure into a voltage signal. The volume flow rate actual value is available as a voltage signal. The factory setting is such that 10 V DC always corresponds to the nominal flow rate (qvnom).
The volume flow rate setpoint value comes from a higher-level controller (e.g. room temperature controller, air quality controller, central BMS). Variable volume flow control results in a value between qvmin and qvmax. It is possible to override the room temperature control, e.g. by a complete shut-off of the duct.
The controller compares the differential pressure setpoint value to the actual value and controls the actuator accordingly if there is a difference.

Category

  • Compact controller for volume flow rate control
  • Control of a constant or variable volume flow rate setpoint
  • Electronic controller for applying a reference value and capturing an actual value for integration with a Modbus or BACnet based central BMS
  • The actual value relates to the nominal volume flow rate so that commissioning and subsequent adjustment are simplified



Application

  • Dynamic transmitter for clean air in ventilation and air conditioning systems




Supply voltage

  • 24 V AC / DC




Actuator

  • Integrated; slow running (running time approx. 120 – 150 s for 90°)




Installation orientation

  • Either direction




Interface/signalling

  • Modbus RTU (RS-485)
  • BACnet MSTP (RS-485)
  • MP bus
  • Analogue hybrid mode
  • Supply and communication not galvanically isolated
  • Termination switchable




Connection

  • Connecting cable with 6 wires




Interface information

  • Modbus, BACnet, MP bus register
  • Volume flow rate setpoint and actual value, damper blade position, error status, etc.




Special functions

  • Activation of qvmin, qvmax, CLOSED and OPEN positions with Modbus, BACnet or MP bus register
  • Optional operating mode: open loop (actuator with air flow measurement)




Parameter setting

  • Parameters specific to the VAV terminal unit are factory set
  • Operating values qvmin, qvmax and interface type are factory set
  • Values can be adjusted at a later stage in the Modbus, BACnet or MP bus register or with optional tools, i.e. adjustment device or PC software (wire connection in each case)




Factory condition


  • Electronic controller factory-mounted on the terminal unit
  • Factory parameter settings
  • Functional test under air; certified with sticker


Control component BM0 (shown together with TVR as an example)
TVRDP1/200/D2/BM0/V/500 – 1200 [m³/h]
|||||||||
1234567911
1 Type
TVR
VAV terminal unit

2 Acoustic cladding
No entry: none
D With acoustic cladding

3 Material
No entry: galvanised sheet steel
P1 Powder-coated RAL 7001 (silver grey)
A2 Stainless steel construction

4 Duct connection
No entry: push-fit, suitable for ducts according to EN 1506; with groove for optional lip seal
FL Flanges on both ends

5 Nominal size [mm]
100, 125, 160, 200, 250

6 Accessories

No entry: without accessories
D2 Double lip seal both ends (push-fit only)
G2 Matching flanges for both ends (only with FL)

7 Attachments (control component)
BM0 Compact controller with dynamic transducer and Modbus RTU, BACnet MS/TP or MP bus interface

9 Operating mode
V
Variable operation (adjustable setpoint value range)

11 Operating values for factory setting
Volume flow rate [m3/h or l/s]
qvmin – qvmax 


Order example: TVR-D-P1/200/D2/BM0/V/500-1200[m³/h]

TypeTVR
Acoustic claddingWith acoustic cladding
MaterialPowder-coated RAL 7001 (silver grey)
Duct connectionPush-fit, suitable for ducts according to EN 1506; with groove for optional lip seal
Nominal size [mm]200
AccessoriesDouble lip seal both ends
Attachments (control component)BC0 – Compact controller with dynamic transducer and Modbus RTU, BACnet MS/TP or MP bus interface
Operating modeVariable operation
Operating values for factory setting500 – 1200 [m3/h]

Variants, Product details

  • VARIANTS
  • PRODUCT DETAILS



Analogue mode or hybrid mode 0 – 10 V DC or 2 – 10 V DC

The controller is supplied from the factory with operating mode Modbus-RTU. For analogue or hybrid mode, it must be switched over on-site using the ZTH-EU or PC tool. The analogue interface can be adjusted for the signal voltage range 0 – 10V DC or 2 – 10 V DC using PC tool. 
The assignment of the volume flow rate setpoint value or actual value for voltage signals is shown in the characteristic curves. In hybrid mode, an analogue control input signal with digital feedback as per the bus interface list is possible.

 

Analogue hybrid mode

  • With analogue setpoint value setting via cable wire 3 and analogue feedback via cable wire 5, it is nevertheless possible to have feedback via BACnet MS/TP or Modbus RTU.
  • Override controls qvmin, qvmax, damper blade in the OPEN position or damper blade CLOSED possible via bus interface.
  • Various operating parameters as per the bus interface list can be called up via BACnet MS/TP or Modbus RTU.

 

Setpoint value setting

Variable operation

  • In the variable operating mode, setpoint values are set using an analogue signal at cable wire 3. Setpoint value settings via the respective bus system are rejected.
  • The selected signal voltage range 0 – 10V or 2 – 10V DC is assigned to the volume flow rate range qvmin – qvmax set.
  • Volume flow rate range qvmin – qvmax pre-set in the factory according to the order code entries.
  • Subsequent adjustment of qvmin or qvmax possible via service tool ZTH-EU or PC tool.

 

Constant value mode

  • In the constant value mode operating mode, an analogue signal is not required at cable wire 3.
  • The volume flow rate constant value set by qvminis regulated. 
  • Volume flow rate qvmin is pre-set in the factory according to the order code entry.
  • Subsequent adjustment of qvminpossible via service tool ZTH-EU or PC tool.

 

Actual value as feedback for monitoring or tracking control

  • The actual volume flow rate measured by the controller can be tapped as a voltage signal at cable wire 5. 
  • The selected signal voltage range 0 – 10V DC or 2 – 10V DC is shown in the volume flow rate range 0 – qvnom .
  • In analogue mode there is also the option of querying operating data using the Modbus interface.

 

Override control

For special operating situations, the volume flow controller can be put in a special operating mode (override control). The following are possible: control qvmin, control qvmax, damper blade in the OPEN position or damper blade CLOSED.

 

Override controls via signal input Y
Thanks to appropriate wiring on the signal input Y, the override controls can be activated according to the connection diagrams via wiring with external switch contacts / relays (see wiring examples). OPEN and CLOSED are only available if the controller is supplied with alternating current (AC).

 

Override control CLOSED via control signal on control signal Y

  • With signal voltage range 0 – 10V DC: CLOSED is activated when qvmin = 0 set and  control signal Y < 0.5V DC.
  • with signal voltage range 2 – 10 V DC: CLOSED is activated when control signal is Y < 2.4 V (*1) DC.

 

Override controls in analogue mode via Modbus interface

If the Modbus interface is additionally connected in analogue mode, an override control can also be specified via Modbus register 1.
 

Override control for diagnostic purposes
Activation via service tools ZTH-EU or PC tool
 

Prioritisation of various setting options

  • Settings for override controls via analogue are prioritised over Modbus/BACnet settings.
  • Highest priority: setting via an analogue override control 
  • Medium priority: settings via the service connector (adjustment device, PC software) for test purposes
  • Lowest priority: setting via Modbus/BACnet/MP bus 

Technical data

  • TECHNICAL DATA


Compact controllers for VAV terminal units


VAV terminal units

Type of installation componentPart number
TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVALMV-D3-M/B TRA00000070458

TVJ and TVT up to 900 × 400 or 800 × 400

NMV-D3-M/B TRA00000070469
TVM2x LMV-D3-M/B TR

A00000070458

TVJ

NMV-D3-M/B TRA00000070469

TVT up to 1000 × 300 or 800 × 400

NMV-D3-M/B TRA00000070469

TVT from 900 × 400

SMV-D3-M/B TR

A00000090713


 

 


Compact controller BM0, LMV-D3-M/B TR


Measurement principle/installation orientationDynamic measurement principle, position-independent
Supply voltage (AC)

24 V AC, 50/60 Hz

Supply voltage (DC)

24 V DC

Power rating (AC)

4 VA max. (8 A max. @ 5 ms)

Power rating (DC)

2 W max.

Torque

5 Nm

Bus connection

Modbus RTU**, BACnet MS/TP, MP-Bus



Adjustable communication parameters Modbus RTU


Baud rate: 9600, 19200, 38400**, 76800, 115200;

Address: 1**, 2, 3 – 247;

Parity: 1-8-N-2**, 1-8-N-1, 1-8-E-1, 1-8-O-1;

No. of nodes: up to 32 (without repeater);

Terminal resistor: 120 Ω, integral, can be activated

Adjustable communication parameters BACnet MS/TP

Baud rate: 9600, 19200, 38400**,76800, 115200;

Address: 0, 1**, 2, 3 – 127;

No. of nodes: up to 32 (without repeater);

Terminal resistor: 120 Ω, integral, can be activated

Addressing

Required on-site: e.g. adjustment device ZTH-EU

Setpoint value signal input (analogue optional)

0 – 10 V or 2 – 10 V DC

Actual value signal output (analogue optional)

2 – 10 V DC 

Connections

Cable, 6 × 0.75 mm², preassembled

IEC protection class

III (protective extra-low voltage)

Protection level

IP 54

Functional range

19.2 – 28.8 V AC or 21.6 – 28.8 V DC

EC conformity

EMC to 2014/30/EU

Weight

0.5 kg

**Factory setting


Compact controller BM0, NMV-D3-M/B TR

Measurement principle/installation orientationDynamic measurement principle, position-independent
Supply voltage (AC)

24 V AC, 50/60 Hz

Supply voltage (DC)

24 V DC

Functional range

AC 19.2 – 28.8 V/DC 21.6 – 28.8 V

Power rating (AC)

5 VA max. (8 A max. @ 5 ms)

Power rating (DC)

3 W max.

Torque

10 Nm

Bus connection

Modbus RTU**, BACnet MS/TP, MP-Bus

Adjustable communication parameters Modbus RTU

Baud rate: 9600, 19200, 38400**, 76800, 115200;

Address: 1**, 2, 3 – 247;

Parity: 1-8-N-2**, 1-8-N-1, 1-8-E-1, 1-8-O-1;

No. of nodes: up to 32 (without repeater);

Terminal resistor: 120 Ω, integral, can be activated

Adjustable communication parameters BACnet MS/TP

Baud rate: 9600, 19200, 38400**, 76800, 115200;

Address: 0, 1**, 2, 3 – 127;

No. of nodes: up to 32 (without repeater);

Terminal resistor: 120 Ω, integral, can be activated

Addressing

Required on-site: e.g. adjustment device

Setpoint value signal input (analogue optional)

0 – 10 V or 2 – 10 V DC

Actual value signal output (analogue optional)

2 – 10 V DC 

Connections

Cable, 6 × 0.75 mm², preassembled

IEC protection class

III (protective extra-low voltage)

Protection level

IP 54

EC conformity

EMC to 2014/30/EU

Weight

0.7 kg

**Factory setting


Compact controller BM0, SMV-D3-M/B TR

Measurement principle/installation orientationDynamic measurement principle, position-independent
Supply voltage (AC)

24 V AC, 50/60 Hz

Supply voltage (DC)

24 V DC

Power rating (AC)

6.5 VA max. (8 A max. @ 5 ms)

Power rating (DC)

3.5 W max.

Torque

20 Nm

Bus connection

Modbus RTU**, BACnet MS/TP, MP bus

Modbus RTU communication parameters to be set

Baud rate: 9600, 19200, 38400**, 76800, 115200;

Address: 1**, 2, 3 – 247;

Parity: 1-8-N-2**, 1-8-N-1, 1-8-E-1, 1-8-O-1;

No. of nodes: up to 32 (without repeater);

Terminal resistor: 120 Ω, integral, can be activated

BACnet MS/TP communication parameters to be set

Baud rate: 9600, 19200, 38400**, 76800, 115200;

Address: 0,1**,2.3 – 127;

No. of nodes: up to 32 (without repeater);

Terminal resistor: 120 Ω, integral, can be activated

Addressing

By others; with an adjustment device, for example

Setpoint value signal input (analogue as an option)

0 – 10 V or 2 – 10 V DC

Actual value signal output (analogue as an option)

2 – 10 V DC

Connections

Plug-in cable, 6 × 0.75 mm²

IEC protection class

III (protective extra-low voltage)

Protection level

IP 54

Functional range

AC 19.2 – 28.8 V/DC 21.6 – 28.8 V

EC conformity

EMC to 2014/30/EU

Weight

0.7 kg

**Factory setting


Commissioning

  • As the volume flow rates are factory set, the terminal units have to be installed at the specified locations
  • Comply with the volume flow rate control ranges of the VAV terminal units; do not set a volume flow rate lower than the minimum flow rate
  • Additional commissioning steps for setting up the bus communication (assignment of device addresses) may be required after installation and wiring
  • Additional commissioning steps (using a service tool) may also be required for integrating the control component with the local network

Additional commissioning steps

  • If the Modbus interface is used:
    Adjust the (factory set) device address and communication parameters, for example
  • If the BACnet interface is used:
    Use the service tool to set the type of communication interface to BACnet to change, for example, the device address and communication settings
  • If the MP bus interface is used:
    Use the service tool to set the type of communication interface to MP bus to change, for example, the device address and communication settings

LEDs and operation

Green LED/push button

  • Off: no power
  • On: power is being supplied
  • Blinking: address mode is active; blinking frequency depends on the set address 1 – 16
  • Press the push button:
    during normal operation to start rotation angle adjustment
    in address mode to confirm the set address 1 – 16


Yellow LED/push button

  • Off: normal operation
  • On: adaption or synchronisation in progress or control component in address mode (green LED is blinking)
  • Flickering: communication is active (only with Modbus or BACnet)
  • Keeping the push button pressed for more than 5 s when you switch on the device resets the communication parameters to the factory settings

Additional functions with Modbus or BACnet:

  • Normal operation: Press the push button for more than 3 s to switch the address mode for quick addressing on or off
  • In address mode: Press the push button several times to set the bus address (press 1 × for address 1, 2 × for address 2, etc.)



Service tool range of functions

Function/parameter setting

PC-Tool

ZTH-EU1

Setting of qvmin, qvmax

R, WR, W
Modbus, BACnet settings (address, communication parameters)-R, W
MP bus settings (address)R, WR, W
Setpoint value default setting via analogue connection or bus (Modbus, BACnet or MP bus)-R,W

Signal voltage range setting 0 – 10 V or 2 – 10 V DC for analogue interface

R, WR, W

Note:


R,W = Read and write access
R = Read only
W = Write
- = Function is not available with this service tool.


1minimum version for ZTH-EU Firmware: V 2.09.0004


 


To ensure flawless use, the service tools should always be kept up to date with the latest software version.
Information on current versions/updates for PC-Tool software and adjustment device ZTH-EU can be found on the Belimo Hompage www.belimo.com.


 


 


Modbus RTU communication interface

NumberRegister AddressDescriptionRange EnumerationUnitScalingAccess
1

Setpoint value

Setpoint value between qvmin and qvmax

0 – 10000

Factory setting: 0

%

0.01[R / W]
21

Override control

Overwrites the setpoint value with override control

0: None

1: OPEN

2: CLOSED

3: qvmin

4: qvmid

5: qvmax

Factory setting: None (0)

-

-[R / W]
32

Command triggering -

Release of functions for service and test purposes. Reset resets the controller and clears internal error memory such as register 105.

 

0: None

1: Adaptation

2: Test

3: Synchronisation

4: Reset

Factory setting: None (0)

-

-[R / W]
43

Type of actuator

0: Actuator not connected/not known


1: Actuator air/water with/without safety function


2: Volume flow controller VAV/EPIV


3: Fire damper


4: Energy valve


5: 6way EPIV

-

-[R]
54

Current damper blade position (%)

0 – 10000

%

0.01[R]
65

Damper blade angle (°)

0 – max.

°

1[R]
76

Relative volume flow rate related to qvnom

0 – 10000

%

0.01[R]
87

Absolute volume flow rate related to qvnom

0 – qvnom

m³/h

 

1[R]
98

Sensor value in mV

0 – 65353

mV

1[R]
109

-

-

-

-[–]
1110

Absolute volume flow rate in selected volume flow unit acc. to register 15 (Lowword)

-

UnitSel

0.0001[R]
1211

Absolute volume flow rate in selected volume flow unit acc. to register 15 (Highword)

-

UnitSel

0.0001[R]
1312

Analogue setpoint value (%).

Shows the setpoint value in % with control input signal.

0 – 10000

%

0.01[R]
10099

Bus terminal resistor.

Indicates whether the terminating resistor (120 Ω) is active or deactivated.

0: Inactive

1: Active

Factory setting: inactive (0)

-

-[R / W*]
101100

Serial number, part 1

-

-

-[R]
102101

Serial number, part 2

-

-

-[R]
103102

Serial number, part 3

-

-

-[R]
104103

Firmeware Version.

Example: 302, Version 3.02

-

-

-[R]
105104

Malfunctions and service information

Bit1: Mechanical travel exceeded

Bit2: Actuator cannot be moved (e.g. mechanical overload)

Bit8: Internal activity (e.g. test run, adaptation)

Bit9: Gear release active

Bit10: Bus monitoring triggered

-

-[R]
106105

Setting work areas qvmin

Requirements qvminvmax

Vmax in the area 0 - 100 % qvnom

0 – qvmax

Standard: 0

%

0.001[R / W*]
107106

Setting work areas qvmax

Requirements qvmaxvmin

Vmax in the area 20 - 100 % qvnom

qvmin 10000

Standard: 10000

%

0.01[R / W*]
108107

Sensor type

0: None

1: Active sensor (in hybrid mode)

2: -

3: -

4: Switch contact

Factory setting: None (0)

-

-[R / W*]
109108

Bus timeout monitoring

0: Last setpoint value

1: Fast close – CLOSED

2: Quick open – OPEN

3: Center position

Factory setting: Last setpoint value (0)

-

-[R / W*]
110109

Time until release bus timeout monitoring

0 - 3600 seconds

Factory setting: 0 (bus timeout monitoring deactivated)

 

s

1[R / W*]
111110

Nominal volume flow rate [m³/h]

-

m³/h

1[R]
112111

-

-

-

-[–]
113112

Nominal volume flow rate in selected volume flow unit acc. to Reg 118 (LowWord)

-

UnitSel

0.001[R]
114113

Nominal volume flow rate in selected volume flow unit acc. to 118 (HighWord)

-

UnitSel

0.001[R]
115114

-

-

-

-[–]
116115

-

-

-

-[–]
117116

Control mode

0: Position control (open loop)

1: Volume flow control

-

-[R / W*]
118117

Unit selection

0: m³/s

1: m³/h

2: l/s

3: l/min

4: l/h

5: gpm

6: cfm

Standard m³/h (1)

-

-[R / W*]
119118

Setpoint value setting

 

0: Analogue (0 – 10 V, 2 – 10 V)

1: Bus (Modbus, BACnet, MP-Bus)

Factory setting: Bus (1)

-

-[R / W*]

R = Read-only access to register

R/W = Read/write access to register

R/W* = Limited read/write access to register

Registers from 100 with write access are persistent (stored in EEPROM), regular or cyclical writing must be avoided.




Object processing


Object type

Optional properties

Writeable properties

Analogue input [AI]

Description
COV Increment

COV Increment

Analogue Output [AO]

Description
COV Increment

Present Value
COV Increment
Relinquish Default

Analogue Value [AV]

Description



COV Increment

Present Value



COV Increment

Binary Input [BI]

Description
Active Text
Inactive Text

Device

Description
Location
Active COV Subscriptions
Max Master
Max Info Frames
Profile Name

Object Identifier
Object Name
Location
Description
APDU Timeout (1000 – 60000)
Number Of APDU Retries (0 – 10)
Max Master (1 – 127)
Max Info Frames (1 – 255)

Multi-state Input [MI]

Description
State Text

Multi-state Output [MO]

Description
State Text

Present Value
Relinquish Default

Multi-state Value [MV]

Description
State Text

Present Value (if marked)


Processing of services

  • The device does not support the services "Create object" and "Delete object"
  • The specified maximum length of the writable character strings is based on single-byte characters
  1. Object name 32 characters
  2. Location 64 characters
  3. Description 64 characters
  • The device supports the DeviceCommunicationControl Services, no password necessary
  • A maximum of 6 active COV subscriptions with a run time of 1 – 28800 s (maximum of 8 h) is supported


Protocol Implementation Conformance Statement – PICS (general information)


Date

2020-06-11

Vendor nameTROX GmbH
Vendor ID

329

Product nameVRU-D3-BAC, VRU-M1-BAC, VRU-M1R-BAC
Product model numberVRU – BAC
Application software version

01.02.0001

Firmware revision

10.02.0000

BACnet Protocol Revision

12

Product descriptionController for VAV/CAV and pressure applications
BACnet Standard Device ProfileBACnet Application Specific Controller (B-ASC)
BACnet Interoperability Building Blocks Supported

Data Sharing – ReadProperty-B (DS-RP-B)
Data Sharing – ReadPropertyMultiple-B (DS-RPM-B)
Data Sharing – WriteProperty-B (DS-WP-B)
Data Sharing – WritePropertyMultiple-B (DS-WPM-B)
Data Sharing – COV-B (DS-COV-B)
Device Management – DynamicDeviceBinding-B (DM-DDB-B)
Device Management – DynamicObjectBinding-B (DM-DOB-B)
Device Management – DeviceCommunicationControl-B (DM-DCC-B)

Segmentation CapabilityNo
Data Link Layer OptionsMS/TP master, baud rates: 9600, 19200, 38400, 76800, 115200
Device Address BindingNo static device binding supported
Networking OptionsNone
Character Sets SupportedISO 10646 (UTF-8)
Gateway OptionsNone
Network Security OptionsNon-secure device


 

Communication interface BACnet MS/TP

Object NameObject TypeDescriptionValuesCOV IncrementAccess
DeviceDevice [Inst.No]

0 – 4194302
Default: 1

-

W
RelPosAI[1]

Damper blade position in %

Overridden = 1 (gear latch pressed)

0 – 100

0.01 – 100

Standard: 1

AbsPosAI[2]

Absolute position in °

Overridden = 1 (gear latch pressed)

0 - max. rotation angle

0.01 – 65353

Factory setting: 1

SpAnalogueAI[6]

Analogue setpoint value in %

 

Shows the analogue setpoint value in %, if setpoint value setting is in (SpSource[122]) Analogue (1)

If setpoint value setting (SpSource[122]) Bus (2) = then Out_Of_Service is TRUE

0 – 100

0.01 – 100

Standard: 1

RelFlowAI[10]

Relative volume flow rate in %

0 – 100

0.01 – 100

Standard: 1

AbsFlow_UnitSelAI[19]

Absolute volume flow rate of selected unit acc. to [121]

0 – Vnom

0.01 – 1000

Standard: 1

Sens1AnalogueAI[20]

Sensor 1 is an analogue value in mV
 

Analogue value in mV, if Sensor1Type MV[220] is active.

If (sensor1type MV[220]) = 2 (not active) or (SpSource MV [122]) = 2 (Bus), Out_of_Service = TRUE

-

0.01 – 1000

Standard: 1

SpRelAO[1]

Relative setpoint value in %

 

Setpoint value between qvmin AV[97] and qvmax [98] (Only with bus control input signal)

If SpSource (MV[122]) = 1 (Analogue), then Out_of_Service = TRUE   

0 – 100

Factory setting: 0

0.01 – 100

Factory setting: 1

C
Min.AV[97]

Minimum setpoint value in % (qvmin)

Requirement: qvmin < qvmax

qvmin in the range 0 - 100 & qvnom

0 – Vmax 

Factory setting: 0

0.01 – 100

Factory setting: 1

W
Max.AV[98]

Minimum setpoint value in % (qvmax)

Requirement: qvmax > qvmin

qvmax in the range 20 - 100 % of qvnom

Vmin  – 100

Standard: 100

0.01 – 100

Standard: 1

W
Vnom_UnitSelAV[104]

Current volume flow rate as per selected volume flow unit (UnitSelFlow MV[121])

-

0.01 – 100

Standard: 1

Bus WatchdogAV[130]

Time until the release bus timeout monitoring in s


If Present_Value ≠ 0, then write access to Present_Value is monitored by AO[1] and MO[1]. Writing to Present_Value AO[1] MO[1] resets the timer.
In hybrid mode, only write accesses to MO[1] are monitored.

0 – 3600 s

Factory setting: 0 (bus timeout monitoring deactivated)

0.01 – 1000

Standard: 1

W
Sens1SwitchBI[20]

Switch status of the switch at the sensor input.

If SenType MV [122] = 5 (switch)

If SensType MV [122] ≠ 5

Out_of_Service = TRUE

Inactive_Text: Switch not active

Active_Text: Switch active

-

BusTerminationBI[99]

Terminal resistor

 

Shows whether the terminal resistor (120 Ω) has been activated via the service tools.

Inactive_Text: Switch not active

Active_Text: Switch active

-

SummaryStatusBI[101]

Condensed status

Summary status (MI[106], MI[110])

Inactive_Text: no error

Active_Text: Error

-

InternalActivity

MI[100]

Status Activity

 

1: None

2: Test

3: Adaptation

-

StatusActuator

MI[106]

Status of the actuator

1: OK

2: Actuator cannot be moved

3: Gear release active

4: Mechanical travel exceeded

-

StatusDevice

MO[110]

Status of the unit

Shows the general status of the device

1: OK

2: Bus timeout monitoring activated

-

Override

MO[1]

Override control

Overwrites the setpoint value (SpRel AO[1]) with a forced command.

1: None

2: OPEN

3: CLOSED

4: qvmin

5: qvmid

6: qvmax

Factory setting: None (1)

-

C
Command

MV[120]

Release test functions

1: None

2: Adaptation

3: Test

4: Reset

Factory setting: None (1)

-

W
UnitSelFlow

MV[121]

Unit selection

The selected unit is indicated in AI[19] and AV[104].

1: m³/s

2: m³/h

3: l/s

4: l/min

5: l/h

6: gpm

7: cfm

Factory setting: m³/h (2)

-

W
ControlMode

MV[122]

Setpoint value setting

1: Analogue (0 – 10 V, 2 – 10 V)

2: Bus (Modbus, BACnet, MP-Bus)

Factory setting: Bus (2)

-

W
ControlMode

MV[223]

ControlMode

 

1: Position control (OponLoop)

2: Volume flow control

-

W
Sens1Type

MV[220]

Definition of the sensor type for the analogue input

1: None

2: Active sensor (in hybrid mode)

5: Switch

Factory setting: None (1)

-

W


Product details bus operation


Bus operation

The controller is supplied from the factory with operating mode Modbus-RTU. The operating mode can be switched to BACnet, MP bus or analogue at any time using the service tool ZTH-EU. For a smooth exchange of data in the bus network provided by others, the communication parameters and the user address for the bus interface are required. The communication parameters for the bus systems (address, baud rate etc.) can be set using the ZTH-EU. The interface provides standardised bus register/object access to the available data points.


 


Setpoint value default setting

  • In the operating mode Modbus RTU (factory setting), the setpoint value is only set by specifying the volume flow rate set point value [%] in the Modbus register 0.
  • The transferred percentage value refers to the volume flow rate range specified by qvmin  –  qvmax
  • Volume flow rate range qvmin –  qvmax preset at the factory according to the order code
  • Subsequent adjustment of qvmin  or qvmax possible using service tool ZTH-EU or Modbus/BACnet interface.


 


Actual value as feedback for monitoring or tracking control

  • The actual values can be read off in m³/h (factory setting) in both Modbus and BACnet.
    • Other units such as m³/s, l/s, l/min, l/h, gpm, cfm possible
  • In addition to the volume flow rate actual value, further information on other Modbus registers/BACnet objects can be read out.
    • Overview of the registers/objects in the communication tables
  • For diagnostic purposes, the volume flow rate actual value can be tapped at cable wire 5 in bus mode
    The volume flow rate range 0 – qvNom always corresponds to the signal voltage range of (0)2 – 10 V DC


 


Override control



For special operating situations, the volume flow controller can be put in a special operating mode (override control). The following modes are possible: control Pvmin, control qvmax, damper blade in the OPEN position or damper blade CLOSED.




 


Override control via the bus



This is set via the Modbus register 1 or via BACnet object type MO[1].




 


Override control via bus timeout monitoring (Modbus)



If the Modbus communication fails for a stipulated time period, a pre-defined operating mode qvmin, qvmax, OPEN or CLOSED can be activated.

  • The override control to be activated upon bus timeout is specified via Modbus register 108
  • The time period after which override control is activated upon bus timeout is specified via Modbus register 109
  • Each Modbus communication resets the timeout of the bus timeout monitoring



 


Override control via bus timeout monitoring (BACnet)

If the BACnet communication fails for a specified period, a predefined operating state can be activated.



  • The setpoint value to be activated upon bus timeout is specified via Relinquish_Default from SpRel (object AO1)
  • Bus timeout period is defined via BusWatchdog (object type AV [130])
  • Communication on the data points SpRel (Object AO[1] and Override (Object MO[1])


 


Override controls for diagnostic purposes

Activation via bus system, external/on-site switch contacts, ZTH-EU or PC software.


 


Prioritisation of various setting options



Settings for override controls via analogue are prioritised over Modbus/BACnet settings.

  • Highest priority: setting via an analogue override control 
  • Medium priority: settings via the service connector (adjustment device, PC software) for test purposes
  • Lowest priority: setting via Modbus/BACnet/MP-Bus 



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