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Siemens RWD Primary Controls Modbus Interface CB1P3099en_01

Building Technologies Modbus Operation 27.10.2009

Read RWD68 parameter (ADDR = 30055, 30056) called “RWDAPP” with Modbus

ADDR = 0054, 0055:

SEZ50MB

Device Address

Function Code

Modbus Address Data Length CRC16 Check

Send

F7 04 00 36 00 00 or 01

85 53

↑ WRONG INFO

SEZ50MB

Device

Address

Function

Code

Exception Code CRC16 Check

Respond

F7 84 14 A3 3D

Write RWD32S parameter (ADDR = 00001) called “bFrostEnable” with Modbus ADDR

= 0000:

SEZ50MB

Device Address

Function Code

Modbus Address Value CRC16 Check

Send

F7 05 00 00 FF FF 98 AC

↑ WRONG INFO

SEZ50MB

Device Address

Function Code

Modbus Address Value CRC16 Check

Send

F7 05 00 00 00 FF 98 AC

↑ WRONG INFO

SEZ50MB

Device

Address

Function

Code

Exception Code CRC16 Check

Respond F7 85 03 E2 A3

Note: Only two possibilities for Value column – writing a “0” using Value = 0x 00 00

or writing a “1” using Value = 0x FF 00

Write RWD68 parameter (ADDR = 40117, 40118) called “SP3day” with Modbus ADDR

= 0116, 0117:

SEZ50MB

Device Address

Function Code

Modbus Address Data Length Byte

Count

Send

F7 10 00 74 00 01 To below

↑ WRONG INFO

Data

Length

Byte

Count

Status

(IEEE 754 format)

CRC16 Check

From

Above

04 41 E8 00 00

(SP3 day setpoint 29 °C)

7C FB

SEZ50MB

Device Address

Function Code

Modbus Address Data Length Byte

Count

Send

F7 10 00 74 00 02 To below

Data

Length

Byte

Count

Status

(IEEE 754 format)

CRC16 Check

From

Above

05 41 E8 00 00

(SP3 day setpoint 29 °C)

7C FB

↑ WRONG INFO

SEZ50MB

Device

Address

Function

Code

Exception Code CRC16 Check

Respond F7 90 14 AC 3D

Function Code 0x04 à

(Error Message)

Function Code 0x05 à

(Error Message)

Function Code 0x10 à

(Error Message)