FläktGroup 327VMZ-BN Modbus Implementation User guide

Brand: FläktGroup

Model: 327VMZ-BN Modbus Implementation

Type: User guide

MODBUS IMPLEMENTATION GUIDE

Volumetric flow control device

327VMZ

FläktGroup DC_10606GB 20221117_R0 Speciﬁcations are subject to alteration without notice.

Volumetric ﬂow control device 327VMZ - Modbus implementation guide

TABLE OF CONTENTS

Table of contents ..........................................................................................................................................................................................................................2

1 General .................................................................................................................................................................................................................................3

1.1 Technical data ..........................................................................................................................................................................................................................3

1.2 Default Modbus settings .......................................................................................................................................................................................................3

1.3 Modbus message frame ......................................................................................................................................................................................................3

1.4 Supported Modbus function codes ...................................................................................................................................................................................3

1.5 Data types ..................................................................................................................................................................................................................................3

1.6 CRC ............................................................................................................................................................................................................................................3

2 Modbus registers ...................................................................................................................................................................................................................4

2.1 Operation values ......................................................................................................................................................................................................................4

2.2 Service values ..........................................................................................................................................................................................................................5

2.3 Status register (Modbus register 105).............................................................................................................................................................................6

2.4 Sensor status (Modbus register 132) ..............................................................................................................................................................................7

2.5 Modbus communication settings register (Modbus register 569) .......................................................................................................................8

2.6 Mode register (Modbus register 770) ..............................................................................................................................................................................9

FläktGroup DC_10606GB 20221117_R0 Speciﬁcations are subject to alteration without notice.

Volumetric ﬂow control device 327VMZ - Modbus implementation guide

GENERAL

1 GENERAL

1.1 TECHNICAL DATA

Modbus

Protocol Modbus RTU

Medium

Cable 1000 mm,

2 x 0,38 mm2 (halogen free) RS-485,

not electrically isolated

Number of nodes Max. 128

Baudrates 1200 / 2400 / 4800 / 9600 / 19200 / 38400 /

76800 / 115200 Bd

Byte sequence MSB / LSB

Byte formats

1 start bit, 8 data bits, 2 stop bits, no parity

1 start bit, 8 data bits, 1 stop bit, even parity

1 start bit, 8 data bits, 1 stop bit, odd parity

Termination external (120 Ω)

Response time ≤ 10 ms + delay

Delay Conﬁgurable 0...765 ms

1.2 DEFAULT MODBUS SETTINGS

Transmission mode RTU

Address 1

Transfer rate 19200 bps

Data bits 8

Parity Even

Stop bits 1

Delay 0 ms

Response time 10 ms + delay

1.3 MODBUS MESSAGE FRAME

Address Funktion code Data CRC End

1byte 1byte N*1byte 2bytes 3,5 char *

Message frames are separated from each other by a silent interval of

at least 3.5 * character time.

1.4 SUPPORTED MODBUS FUNCTION CODES

Function code Name Description

03H Read holding register

Device parameter/

actual values read

(integer/ﬂoat)

06H Write single register Device parameter

single word write

1.5 DATA TYPES

The data types that are used for each register can be found from

Modbus registers section.

CHAR is an 8-bit value. CHAR value uses the low byte of a word

BYTE is an 8-bit integer value. BYTE value uses the low byte of a word

WORD is an 16-bit integer value. Word value uses the low byte and the

high byte of a word register (except explicitly noted otherwise).

1.6 CRC

CRC is calculated according to “MODBUS over Serial Line, Speciﬁcation

and Implementation Guide V1.02”.

FläktGroup DC_10606GB 20221117_R0 Speciﬁcations are subject to alteration without notice.

Volumetric ﬂow control device 327VMZ - Modbus implementation guide

MODBUS REGISTERS

2 MODBUS REGISTERS

2.1 OPERATION VALUES

Number Name Address Data type Value range Read/write Description Default

1Setpoint 0WORD 0...10 000 R/W

Shows/sets Setpoint [%]

0 ...100.00% matches on Min and Max

0% = Min

100% = Max

The register is read only,

if register 123 = 0 or 3

2Override control 1WORD 0...8 R/W

Sets Override

’0’ = No override

’1’ = Open

’2’ = Close

’3’ = Min

’4’ = Max

’5’ = Between

’6’ = Fast open

’7’ = Fast close

’8’ = Stop

3Command 2WORD 3R/W ‘3’ executes sensor calibration

Do not write any other values. -

4Device ID 3WORD 0...6 R

Shows Device ID

’0’ = No actuator

’1’ = HVAC / water actuator

’2’ = VAV actuator

’3’ = Fire protection actuator

’4’ = GUAC VAV

’5’ = GUAC CM

’6’ = GT

5Relative position 4WORD 0...10 000 RShows relative position [%] 0...100.00 -

6Absolute position 5WORD 0...65535 RShows absolute position [°] 0...650.00 -

7Relative ﬂow 6WORD 0...10 000 RShows relative ﬂow [%] 0...100.00 -

8Absolute ﬂow 7WORD 0...65535 RShows absolute ﬂow in selected unit

[l/s, m

/h] -

9Analog input Y 8WORD 0...10 000 R

Shows signal value of analog input Y

[mV] 0...10000

The register value is not valid if forced

control is activated via analog input.

11 Analog output U 10 WORD 0...10 000 R/W

Sets analog output U [mV] 0...10 000

See also register 123

13 Temperature 12 WORD (signed) -5000...+30 000 RAir temperature [°C] -50.00 ... +300.00

21 Absolute setpoint 20 WORD Min...Max R/W

Shows/sets setpoint [l/s, m

/h]

The register is valid only, if register

123 = 1 or 2 and no override or forced

control is active.

The value is limited between Minimum and

Maximum ﬂow. Changing the register value

will change also value on Register 1.

FläktGroup DC_10606GB 20221117_R0 Speciﬁcations are subject to alteration without notice.

Volumetric ﬂow control device 327VMZ - Modbus implementation guide

MODBUS REGISTERS

2.2 SERVICE VALUES

The values are used only when commissioning the damper or monitoring status. Do not write values constantly to the Service registers.

Number Name Address Data type Value range Read/write Description Default

104 Software version 103 WORD 1...65535 RShows software version -

105 Service information 104 WORD 1...65535 RShows status of the actuator

See status register table. -

106 Min. value relative 105 WORD 0...10 000 R/W Sets Min value [%] 0... 100.00% 0

107 Max. value relative 106 WORD 0...10 000 R/W Sets Max value [%] 0... 100.00% 10 000

109 Bus fail position 108 WORD 0...5 R/W

Sets the actuator position when no communica-

tion on bus within 120 seconds

’0’ = Last setpoint. De-activates bus fail position

function if analog control is used.

’1’ = Closed position at bus monitoring timeout

’2’ = Open position at bus monitoring timeout

’3’ = Min ﬂow at bus monitoring timeout

’4’ = Btw ﬂow at bus monitoring timeout

’5’ = Max ﬂow at bus monitoring timeout

119 Btw. value relative 118 WORD 0...10 000 R/W Sets Btw value [%] 0...100.00% 5 000

120 Btw. value absolute 119 WORD 0...10 000 R/W Sets Btw value in selected unit [l/s, m

/h] Size

depended

121 Min. value absolute 120 WORD 0...10 000 R/W Sets Min value in selected unit [l/s, m

/h] 0

122 Max. value absolute 121 WORD 0...10 000 R/W Sets Max value in selected unit [l/s, m

/h] Size

depended

123 Setpoint source and

analog output mode 122 WORD 0...3 R/W

Sets setpoint reference and analog output mode

Value of the

Setpoint

source

Value of Output

signal U

0Setpoint from

analog input Y

Analog to actual

ﬂow 0(2)...10V

Setpoint from

Analog to actual

ﬂow 0(2)...10V

Setpoint from

Value from

3Setpoint from

analog input Y

Value from

131 Modbus address 130 WORD 1-247 R/W Sets device Modbus address 1

132 Sensor status 131 WORD 1...65535 RShows sensor status

See sensor status register table. -

133 Installation

parameter 132 WORD 50...150 R/W Sets Inst. parameter 100

202 Air volume ﬂow unit 201 WORD 0...1 R/W Sets air volume ﬂow unit

0 = l/s, 1 = m

/h 0

542 Automatic calibration 541 WORD 0...1 R/W ’0’ = Automatic calibration on

’1’ = Automatic calibration off 1

569 Modbus communication

parameter 568 BYTE 0...32 R/W

Sets Modbus communication settings

See Modbus comm. settings register table.

Note: Stored value starts from 0.

570 Modbus response delay 569 BYTE 0...255 R/W

Some master devices require a delay when

switching from transmission mode to reception

mode. This response delay is added to 3.5 char-

acters at the end of the message. The delay time

is adjustable in steps of 3 ms x 0...255.

770 Mode register 769 WORD 1...65535 RShows override status

See Mode register table. -

FläktGroup DC_10606GB 20221117_R0 Speciﬁcations are subject to alteration without notice.

Volumetric ﬂow control device 327VMZ - Modbus implementation guide

MODBUS REGISTERS

2.3 STATUS REGISTER (MODBUS REGISTER 105)

The status register makes possible to monitor a health of the actuator.

bit Description Action if bit value is 1

00 = Everything OK

1 = Memory corrupted The actuator needs to be replaced.

10 = Everything OK

1 = Memory corrupted The actuator needs to be replaced.

20 = Everything OK

1 = Password protected memory space open

Contact FläktGroup technical support.

Do not restart or power off the actuator!

30 = Everything OK

1 = Password protected memory space open

Contact FläktGroup technical support.

Do not restart or power off the actuator!

40 = Everything OK

1 = Fatal error The actuator needs to be replaced.

0 = Everything OK If bit 12 = 1 actuator has reached end position.

1 = The actuator has detected a mechanical block or has reached end

position

If bit 12 = 0 actuator might be blocked. Ensure there is no physical obstacles

preventing actuator from moving. Use override Open and Close controls to

move actuator both directions.

60 = Normal operation

1 = Seepage ﬂow detected

The actuator drives to closed position.

Check that there is sufﬁcient air ﬂow in the duct.

70 = Motor is not driving

1 = Motor is driving No actions needed.

8Not used

9Not used

10 Not used

11 0 = Normal operation

1 = Motor timeout fault Contact FläktGroup technical support.

12 0 = Actuator within normal operation range

1 = Actuator has reached the end position

If forced control or override Open or Closed is not activated,

check that air ﬂow to the actuator is sufﬁcient.

13 0 = Contorl loop not running

1 = Control loop running No actions needed.

14 0 = Control loop not in dead band

1 = Control loop in dead band No actions needed.

15 0 = Normal operation

1 = Restart at next main loop event No actions needed.

FläktGroup DC_10606GB 20221117_R0 Speciﬁcations are subject to alteration without notice.

Volumetric ﬂow control device 327VMZ - Modbus implementation guide

MODBUS REGISTERS

2.4 SENSOR STATUS (MODBUS REGISTER 132)

The status register makes possible to monitor status of the sensor.

bit Description Values

0Operation status 0 = Measurement function not active

1 = Normal operation (Measurement function active)

1Communication fault 0 = Communication between actuator and sensor OK

1 = Communication fault between actuator and sensor

2Low air speed 0 = Measured air speed > 0.5 m/s

1 = Measured air speed < 0.5 m/s

3High air speed 0 = Measured air speed < 15 m/s

1 = Measured air speed > 15 m/s

4Sensor busy 0 = Normal operation (Measurement function active)

1 = Sensor is performing zero point calibration (Measurement function not active)

5Factory calibration 0 = Factory calibration missing

1 = Factory calibration OK

6Status bit 0 = Status OK

1 = Contact FläktGroup technical support

7Status bit 0 = Status OK

1 = Contact FläktGroup technical support

8Status bit 0 = Status OK

1 = Contact FläktGroup technical support

9Status bit 0 = Status OK

1 = Contact FläktGroup technical support

FläktGroup DC_10606GB 20221117_R0 Speciﬁcations are subject to alteration without notice.

Volumetric ﬂow control device 327VMZ - Modbus implementation guide

MODBUS REGISTERS

2.5 MODBUS COMMUNICATION SETTINGS REGISTER (MODBUS REGISTER 569)

0b1 1200 None 2

1b2 1200 Even 1

2b3 1200 Odd 1

3b4 2400 None 2

4b5 2400 Even 1

5b6 2400 Odd 1

6b7 4800 None 2

7b8 4800 Even 1

8b9 4800 Odd 1

9b10 9600 None 2

10 b11 9600 Even 1

11 b12 9600 Odd 1

12 b13 19200 None 2

b14 19200 Even 1

14 b15 19200 Odd 1

15 b16 38400 None 2

16 b17 38400 Even 1

17 b18 38400 Odd 1

b19 1200 None 1

b20 2400 None 1

b21 4800 None 1

b22 9600 None 1

b23 19200 None 1

b24 38400 None 1

b25 76800 None 1

b26 115200 None 1

26 b27 76800 None 2

27 b28 76800 Even 1

28 b29 76800 Odd 1

29 b30 115200 None 2

30 b31 115200 Even 1

31 b32 115200 Odd 1

default Modbus communication parameter

not according Modbus spesiﬁcation

FläktGroup DC_10606GB 20221117_R0 Speciﬁcations are subject to alteration without notice.

Volumetric ﬂow control device 327VMZ - Modbus implementation guide

MODBUS REGISTERS

2.6 MODE REGISTER (MODBUS REGISTER 770)

The status register makes possible to check settings of the actuator and monitor active overrides.

bit Description Values

0Analog signal mode 0 = 0-10V mode selected

1 = 2-10V mode selected

1Setpoint source 0 = Setpoint from analog input Y

1 = Setpoint from Modbus

2Override control CLOSED 0 = Closed override control not active

1 = Closed override control active

3Override control OPEN 0 = Open override control not active

1 = Open override control active

4Override control BETWEEN 0 = Between override control not active

1 = Between override control active

5Override control MAX 0 = Maximum air ﬂow override control not active

1 = Maximum air ﬂow override control active

6Rotation direction reversed

0 = Normal rotation direction

1 = Reversed rotation direction

Contact FläktGroup technical support

7Motor control

0 = Motor control enabled

1 = Motor control disabled

Contact FläktGroup technical support

8Override control MIN 0 = Minimum air ﬂow override control not active

1 = Minimum air ﬂow override control active

9Forced control BETWEEN active 0 = Between forced control not active

1 = Negative rectiﬁed half-wave connected to analog input Y

10 Forced control OPEN active 0 = Open forced control not active

1 = Positive rectiﬁed half-wave connected to analog input Y

11 Forced control MAX active 0 = Maximum air ﬂow forced control not active

1 = Full-wave or 24 VDC connected to analog input Y

12 Forced control MIN active

0 = Minimum air ﬂow forced control not active

1 = Analog input Y disconnected or analog signal is 0/(2) V at analog input Y

13 Analog input signal 10V (MAX air ﬂow) 0 = Analog input signal not equal to 10 V

1 = Analog input signal equal to 10 V

14 Forced control CLOSE active 0 = Closed forced control not active

1 = Grould potential connected to analog input Y in 2-10V mode

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FläktGroup 327VMZ-BN Modbus Implementation User guide

FläktGroup 327VMZ-BN Modbus Implementation User guide

FläktGroup 327VMZ-BN Modbus Implementation User guide

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