XS0

Bus interface Modbus RTU

Volume flow controller - static transducer

Control component for type TVE

CONTROL COMPONENT WITH STATIC TRANSDUCER AND MODBUS RTU INTERFACE

Compact device for use with VAV terminal units TVE

Controller, static differential pressure transducer and actuator in one casing
Use in ventilation and air conditioning systems, only with clean and contaminated air
Simple terminal connection without the use of additional junction boxes
Volume flow rates q_vmin and q_vmax are pre-set in the factory and saved in the controller as adjustable parameters
High data transparency through standardised bus communication Modbus RTU, RS485
Setpoint value defaults, override controls, parameter adjustment via Modbus register
Integral display for volume flow rates, operating modes and setting of operating parameters
Service access for manual adjustment devices and PC configuration software

General information

Application

All-in-one control devices for VAV terminal units
Static differential pressure transducer, electronic controller, and actuator are fitted together in one casing
Static pressure transducer for broader range of applications with clean and contaminated air, e.g. extract air that contains dust and fluff
Suitable for different control tasks depending on the defaulting of the setpoint value
Variable volume flow rate control based on setpoint defaults coming from room temperature controller, central BMS, air quality controller or other sources via a communication
interface or analogue signal
Override controls for activating q_vmin, q_vmax, shut-off, OPEN position via Modbus register or switch/ relay are possible (depending on the interface configuration)
Volume flow rate actual value is available as a network data point or linear voltage signal
Damper blade position is available as a network data point

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 is set in the controller at the factory (q_vmin: minimum volume flow rate, q_vmax: maximum volume flow rate)
Operating parameters are specified via the order code and set in the factory

Operating modes

Modbus (M): setpoint value default via Modbus register
Analogue – variable operation (V): setpoint value default via analogue interface, signal voltage range corresponds to q_vmin to q_vmax
Analogue – constant value mode (F): no setpoint value signal required, setpoint value corresponds to q_vmin

Interface

Communication interface

Modbus RTU, RS485
For data points, see Modbus register list

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)
Alternatively: analogue signal for damper blade position (adjustment by others required)

Note

Interface type according to operating mode pre-set in the factory
Can be adjusted by others using the communication interface (Modbus register) or display

Signal voltage ranges

When using the analogue interface

0 – 10 V DC
2 – 10 V DC

Parts and characteristics

Transducer for static pressure measurements
Overload protection
Terminals with cover
Display and operating elements for simple menu guidance
Menu guidance for adjusting operating parameters and communication interface
Service interface

Construction

TROVM-024T-05I-DS10-MB
Can only be used for type TVE

Commissioning

Due to the volume flow rates set in the factory, always ensure that the control units are only installed in the specified locations
Analogue interface: ready for use after installation and wiring
Modbus interface: additional commissioning steps required
Operating parameters can be adjusted by the customer (using the display, adjustment device or Modbus register)
Zero point correction not required

Useful additions

Adjustment device type GUIV3-M (order code AT-VAV-G3)

Technical information

Function, Specification text, Order code

① Differential pressure transducer
② Actuator
③ Volume flow controller
④ Setpoint value via Modbus or analogue signal
⑤ Shaft with effective pressure channel

VAV terminal units control the volume flow in a closed loop, i.e. measurement - comparison - correction. This is done via a differential pressure sensor. An integral differential pressure transducer converts the effective pressure into a voltage signal. The factory setting is such that 10 V DC correspond to the nominal volume flow rate (q_vnom). The volume flow rate setpoint value defaults from a higher-level controller (e.g. room temperature controller, air quality controller, central BMS). Variable volume flow control results in a value between q_vmin and q_vmax. It is possible to override the room temperature control, e.g. by a complete shut-off of the duct. The controller compares the volume flow rate setpoint value to the actual value and controls the integral actuator accordingly.

Category

Compact controller for volume flow rate
Control according to a constant or variable volume flow rate setpoint
Electronic controller for applying a reference value and capturing an actual value for integration in the central building management system
The actual value is based on the nominal volume flow rate such that commissioning and subsequent adjustment are simplified
Stand-alone operation or integration in central building management system

Application

Static transducer for contaminated air in ventilation and air conditioning systems
Modbus commands (Modbus operating mode)
External switch contacts/wiring (with analogue interface)

Supply voltage

24 V AC / DC

Actuator

Integral; slow-running (running time 100 s for 90°)

Installation orientation

Not critical

Interface/signalling

Modbus RTU (RS-485) or alternatively analogue signals (0 – 10V or 2 – 10V DC) can be used
Interface type set in the factory on the basis of the order code

Connection

Terminals with rubber cap, therefore no additional terminal box required
Double terminal for supply voltage for easy further wiring of up to 3 controllers

Interface information

Modbus: including volume flow rate setpoint value and actual value signal, damper blade position, override control
Alternatively: volume flow rate setpoint value and actual value signal as analogue signal

Special functions

Clearly visible external indicator light for indicating the functions: Set, not set, and power failure
Display for actual values, parameter setting and for test functions
Activation q_vmin, q_vmax, closed, open by: Modbus (with Modbus control), external switch contacts (with analogue control)

Parameter setting

Parameters specific to VAV terminal unit are set at the factory
Operating values: q_vmin, q_vmax and interface type are set in the factory
Subsequent adjustment via display and control element directly on the device or with optional tools: adjustment device, PC software (cable connection in each case), in Modbus mode also via Modbus register access

Factory condition

Electronic controller factory-mounted on the terminal unit
Factory set parameters
Functional test under air; certified with sticker

TVE

–

200

XS0

qvmin

–

qvmax

m³/h

1 Type
TVE VAV terminal unit

2 Acoustic cladding

No entry required: none
D with acoustic cladding

3 Material
Galvanised sheet steel (Standard construction)
P1 Powder-coated RAL 7001, silver grey
A2 Stainless steel construction

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

6 Accessories
No entry required: none
D2 Double lip seal both sides
G2 Matching flanges for both ends

7 Attachments (control component)
XS0  Compact controller with static transducer, Modbus RTU, display

8 Operating mode
F Constant value (a setpoint value)
V variable (setpoint value range)
M Modbus RTU

9 Signal voltage range (only with operating mode F, V)
0 0 – 10 V DC
2 2 – 10 V DC

10 Operating values for factory setting
Volume flow rates in m³/h or l/s
q_vconst  (only with operating mode F)
q_vmin  (only with operating mode V, M)
q_vmax  (only with operating mode V, M)

11 Volume flow unit
m³/h
l/s

Order example: TVE/100/D2/XS0/M/20-350 m³/h

Acoustic cladding	Without
Material	Galvanised sheet steel
Nominal size	100 mm
Accessories	Double lip seal both sides
Attachment	Compact controller Modbus, static transducer
Operating mode	Modbus RTU
Volume flow rate	20 – 350 m³/h

Variants, Product details

Compact controller XS0 for TVE

① Compact controller
② Damper blade position indicator and release button
③ Display
④ Rotary selector switch - Selection Options/Setting values
⑤ LED button - Selection Menu entry
⑥ Terminal

Analogue mode 0 – 10 V DC or 2 – 10 V DC (order code, operating mode V, F)

The analogue interface can be adjusted for the signal voltage range 0 – 10 V DC or 2 – 10 V DC.
The assignment of the volume flow rate setpoint value or actual value to voltage signals is shown in the characteristic curves.

The set signal voltage range always applies equally to setpoint value and actual value signals.
The signal voltage range is pre-set in the factory according to the order code entries.
The signal voltage range can be adjusted by others in the setup menu on the display or using the adjustment device.

Setpoint value default setting

In operating mode V (variable mode), the setpoint value defaults with an analogue signal on terminal Y.
Setpoint value defaults via the Modbus register 0 are rejected.
The selected signal voltage range 0 – 10 V or 2 – 10 V DC is assigned to the volume flow rate range q_vmin – q_vmax.
Volume flow rate range q_vmin – q_vmax preset at the factory as per the order key data.
Subsequent adjustment of q_vmin or q_vmax is possible in the setup menu on the display or using the adjustment device.

In operating mode F (constant value mode), an analogue signal on terminal Y is not required.
The volume flow rate constant value q_vmin is used.
Volume flow rate q_vmin is set at the factory as per the order key data.
Subsequent adjustment of q_vmin is possible in the setup menu on the display or using the adjustment device.

Actual value as feedback for monitoring or tracking control

On the terminal U, the actual volume flow rate measured by the controller can be captured as a voltage signal.
The selected signal voltage range 0 – 10 V DC or 2 – 10 V DC corresponds to the volume flow rate range 0 – q_vnom.
In analogue mode (operating mode V, F) 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 modes are possible: control q_vmin, control q_vmax, 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 signal input Y

With signal voltage range 0 – 10 V DC: CLOSED is activated when q_vmin= 0 is set and the control signal is Y < 0.3 V DC.
With signal voltage range 2 – 10 V DC: CLOSED is activated when control signal is Y < 0.8 V _(*1) DC
_(*1) 0.8V = factory setting

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 the diagnostic menu in the display of the controller or the service tools (adjustment device, PC software).

Prioritisation of various default setting options
Various override control options are prioritised as follows by the controller:

Highest priority: defaults via the service connector (adjustment device, PC software) for test purposes
Medium priority: defaults via Modbus register 1 or the diagnostic menu on the controller
Lowest priority: defaults via the Y signal input of the controller

Product details, Technical data

Terminal assignment for analogue operation 0 - 10 V DC or 2 - 10 V DC

⊥, – = Ground, neutral
~, + = Supply voltage 24 V AC/DC
Y = Setpoint signal and local override
U = Actual value signal
B+ = RS-485 bus (Modbus RTU)
A- = RS-485 bus (Modbus RTU)

Notes

Setpoint and actual value signal depending on selected signal voltage range 0 - 10 V DC or 2 - 10 V DC
Setpoint specification via the Modbus is ignored with factory-ordered operating mode F or V (pure analogue operation).
For on-site alternative configuration, see description for interface configuration and register 122
Operating value query possible via Modbus
Utilities and bus connections are not galvanically isolated
Voltage supply: Make sure that all devices on the bus have the same GND reference point
Use bus terminating resistors at the ends of the bus line

Volumenstromsollwert_0-10V_fo_01pdflink.pdf.link

Volumenstromistwert_0-10V_fo_01pdf.pdf.link

Volumenstromsollwert_2-10V_fo_01pdf.pdf.link

Volumenstromistwert_2-10V_fo_01pdflink.pdf.link

Compact controllers for VAV terminal units

VAV terminal units	Type of installation component	Part number
TVE	TROVM-024T-05I-DS10-MB	A00000069231

Compact controller TR0VM-024T-05I-DS10-MB

Supply voltage (AC)	24 V AC ± 20%, 50/60 Hz
Supply voltage (DC)	24 V DC ± 20 %
Power rating (AC)	NW 100 – 200: max. 4 VA NW 250 – 400: max. 7 VA
Power rating (DC)	NW 100 – 200: max. 2.5 W NW 250 – 400: max. 4 W
Power consumption (when running/when idle)	1 W
Run time for 90°	100 s
Setpoint value signal input (analogue optional)	0 – 10 V DC, Ra > 100 kΩ or 2 - 10V DC Ra> 50 kΩ
Actual value signal output	0 – 10 V DC or 2 – 10 V DC; max. 5mA
IEC protection class	III (protective extra-low voltage)
Protection level	IP 42 (with the terminal cover attached)
EC conformity	EMC to 2014/30/EU
Bus connection	Modbus RTU, RS485
Number of nodes	128
Adjustable communication parameters	1200 – 115,200 Bd Start bit: 1 Data bits: 8 Stop bits: 1 or 2 Parity: None, Even, Odd
Setpoint / actual value interface (Modbus)	via Modbus register list
Cable termination	Externally required

Interface configuration of control component

Depending on the setting, the Modbus communication interface or the analogue interface is available for defaulting the volume flow rate setpoint. The so-called interface mode is preset at the factory according to the order code and can be adjusted on-site by setting via the menu navigation or the Modbus registers.

Typical interface configuration

XS0	Setpoint value default setting via:	Actual values via:	Corresponds to order key option	Menu configuration (Mode)
Analogue operation	Analogue 0 – 10 V	Analogue 0 – 10 V	V or F	CA0
Analogue operation	Analogue 2 – 10 V	Analogue 2 – 10 V	V or F	CA2
Modbus operation	Modbus register setpoint	Modbus register actual value or analogue 2 - 10V	M	CB

A special configuration of the Modbus register interface mode enables the configuration of a mixture of Modbus and analogue modes. For more information, see the description of the interface mode in Modbus register 122.

Supplementary use of the Modbus interface in analogue mode

In analogue mode, only the setpoint values defaulting on the analogue input are used. Setpoint default setting via the Modbus interface (register 0) is not possible. Any write attempts will generate an error. Regardless of the selected interface configuration, however, the other Modbus registers can be used. In this way, the volume flow rate actual value and blade position operating values can be read out from a higher-order central BMS with local control via an analogue signal and a connected Modbus, or central override control can also be triggered.

Communication interface Modbus RTU (operating mode M)

Register	Meaning	Access right	Storage
	Volume flow rate setpoint value [%] Reference: Vmin – Vmax (qvmin – qvmax) Resolution: 0 – 10000 Volume flow rate setpoint value: 0.00 – 100.00%	R, W	RAM
1	Activation of an override control; 0 = None; 1 = Open; 2 = Close; 3 = Vmin; 4 = Vmax	R, W	RAM
2	Command triggering 0 = none; 1 = adaptation; 2 = test run; 4 = controller reset	R, W	RAM
4	Current damper blade position [%] Resolution: 0 – 10000 Damper blade position: 0.00 – 100.00%	R	RAM
5	Current damper blade position [°] Reference: without decimal places	R	RAM
6	Current actual volume flow rate [%] Resolution: Vnom Resolution: 0 – 10000 Volume flow rate actual value: 0.00 – 100.00%		RAM
7	Actual volume flow rate in volume flow unit [m³/h], [l/s], [cfm] acc. Register 201	R	RAM
8	Voltage at analogue input Y [mV]	R	RAM
103	Firmware version	R	Flash
104	Status information (Bit = 1 active, bit = 0 inactive) Bit 5 mechanical overload Bit 8 internal activity e.g. test run, adaptation Bit 10 bus timeout monitoring triggered	R	RAM
105	Operating range limitation: Operating parameter Vmin (qvmin) [%] Resolution: Vnom Resolution: 0 – 10000 Vmin: 0.00 – 100.00%	R, W	EEPROM
106	Operating range limitation: Operating parameter Vmax (qvmax) [%] Resolution: Vnom Resolution: 0 – 10000 Vmax: 0.00 – 100.00%	R, W	EEPROM
108	Behaviour in case of bus timeout; 0 = none; 1 = close; 2 = open; 3 = qvmin; 5 = qVmax	R, W	EEPROM
109	Definition of bus timeout [s]	R, W	EEPROM
120	Definition of operating range: operating parameter Vmin (qvmin) in volume flow unit [m³/h], [l/s], [cfm] acc. register 201	R, W	EEPROM
121	Definition of operating range: operating parameters Vmax (qvmax) in volume flow unit [m³/h], [l/s], [cfm] acc. Register 201	R, W	EEPROM
122	Interface definition (Interface mode) For assignment see separate table	R, W	EEPROM
130 *	Modbus address (device address)	R, W	EEPROM
201	Volume flow unit 0 = l/s; 1 = m³/h; 6 = cfm	R, W	EEPROM
231	Setting of mode: Bit 0 defines the characteristic of the analogue interface. Bit 0 = 0 characteristic: 0 – 10 V Bit 0 = 1 characteristic: 2 – 10 V Bit 4 defines the actual value signal as volume flow rate actual value or damper blade position. Bit 4 = 0 volume flow rate actual value Bit 4 = 1 Damper blade position All other bits must not be changed.	R, W	EEPROM
568	Modbus parameter set communication settings: baud rate, parity, stop bits, assignment see separate table	R, W	EEPROM
569	Modbus communication settings: Modbus Response Time = 10 ms + delay; with delay= 3 ms × register value 0 – 255	R, W	EEPROM
572	Setting of switching threshold for override control CLOSE via control signal for signal voltage range 2 – 10 V: Setting range 0.5 V – 1.8 V Default value 0.8V (register value = 20) Resolution: 1 setting unit = 40mV	R, W	EEPROM

* Factory setting: Modbus address 1
R = Register can be read
R,W = Register can be read and written
RAM = Volatile register value
EEPROM = Register value not volatile, but saved permanently (max. 1 million write processes)

Detailed information on register 122 (communication interface setpoint/actual value - Interface Mode)

Register value	Signal input	Feedback signal
	Analogue (0) 2 – 10 V	(0)2 – 10 V
1	Modbus via Register 0	(0)2 – 10 V
2	Modbus via Register 0	Register 10
3	Analogue (0) 2 – 10 V	Register 10

Detailed information on register 568 (Modbus communication parameters)

Register value	Display setting value	Baud rate	Parity	Stop bits
	1	1200	None	2
1	2	1200	Even	1
2	3	1200	Odd	1
3	4	2400	None	2
4	5	2400	Even	1
5	6	2400	Odd	1
6	7	4800	None	2
7	8	4800	Even	1
8	9	4800	Odd	1
9	10	9600	None	2
10	11	9600	Even	1
11	12	9600	Odd	1
12	13	19200	None	2
13	14	19200	Even	1
14	15	19200	Odd	1
15 **	16	38400	None	2
16	17	38400	Even	1
17	18	38400	Odd	1
18	19	1200	None	1
19	20	2400	None	1
20	21	4800	None	1
21	22	9600	None	1
22	23	19200	None	1
23	24	38400	None	1
24	25	76800	None	1
25	26	115200	None	1
26	27	76800	None	2
27	28	76800	Even	1
28	29	76800	Odd	1
29	30	115200	None	2
30	31	115200	Even	1
31	32	115200	Odd	1

** Factory setting: Modbus communication parameters

Range of display functions

Display functions

Volume flow rate actual value (unit optionally m³/h, l/s, cfm)
3-character display with positional notation
Status and error display for various operating states, including display of activated override control, display of diagnostic function

Parameter setting

Adjustment option for the unit of the volume flow rate display m³/h, l/s, cfm
Adjustment option for the operating range q_vmin, q_vmax
Selection of the interface configuration Modbus or analogue including signal voltage range 0 – 10 V or 2 – 10 V DC
Adjustment option for Modbus communication settings (address, baud rate, stop bits, parity)

Diagnosis

Activation of a test run
Activation of override controls Open, Closed, q_vmin, q_vmax, motor stop (note prioritisation)
Display of the voltage value on the analogue input

Commissioning
Note on static transducer type used

Installation orientation not critical
Zero point correction not required

After installation, wiring and connection of the supply voltage

When using the Modbus interface: set the Modbus communication parameters via the integral menu, the air terminal unit is then ready
Setpoint value default setting via Modbus register
When using the analogue interface: air terminal unit is immediately ready for use
Comply with volume flow rate control range from 4 – 100 % of q_vnenn; do not set a volume flow rate which is below the minimum flow rate of the control unit
Only briefly remove the protective cap for the terminals during wiring

Use and description of the display

Pressing the LED push button (< 3 s) selects the next menu item ① - ⑥. The selected menu item can be changed by pressing the LED push button for more than 3 s. Changing is done with the rotary selector switch. Pressing the LED push button again (< 3 s) confirms the selected value. If no entry is made for >= 60 s, the system returns to menu item 1.

Table 1: Description of the menu items

① Flow	Display of actual values or operating states. Setting the volume flow rate unit m³/h, l/s, cfm.
② Vmin	Setting qvmin
③ Vmax	Setting qvmax
④ DIAG	Displays the control signal and feedback signal alternately in [V], Activation of override controls for test and diagnostic purposes: tst = test run oP = damper OPEN cL = damper CLOSE Lo = q_vmin Hi = q_vmax St = Motor stop oFF = Override control Off 000 = Display firmware version
⑤ MODE	Selection of the operating mode: CA0 = Setpoint value setting and actual value return via analogue interface (0 – 10 V) CA2 = Setpoint value setting and actual value return via analogue interface (2 – 10 V) CB2 = Setpoint value setting and actual value return via Modbus - Optional actual value return via (2 – 10 V)
⑥ COM	Setting the modbus address: 1 - 247 and the baud rate, parity, stop bits: 1 (b1) - 32 (b32)

Description of status LEDs and error messages

LED flashing signal	Status	Display
	No supply voltage connected.
	Inform TROX service technicians
	Actuator overload detected (block)
	Synchronisation after Power Up
	Test mode activated
	Overpressure sensor (overpressure)
	Setpoint value or override control position not yet reached (display changes between e.g. Hi = High and actual value)
	Override control position reached (display changes between e.g. Hi = High and actual value)
	Normal operation with the setpoint being maintained. Signalled as long as the actuator does not rotate to readjust the setpoint value.

The flashing signal appears every 2 seconds. 1 = LED is illuminated, 0 = LED is not illuminated

Downloads

product information

Product data sheet control components XS0

XS0_PD_2023_03_15_DE_en Product data sheet 860 KB pdf

certificates

Konformitätserklärung / Declaration of conformity XS0 | XS0-J6 -TR0

TVE-XM0XS0XB0EASY_CE_01_2020_07_30_de_en_fr Certificate 190 KB pdf

operation manuals

Installation and commissioning instructions XM0 | XS0

XM0_XS0-Compact_IM_A00000088381_V2_2022_02_GB_en Installation and commissioning instructions 1,4 MB pdf

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