Basic Documentation

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Siemens RWD Primary Controls Modbus Interface CB1P3099en_01
Building Technologies Modbus Operation 27.10.2009
Read RWD68 parameter (ADDR = 40117, 40118) called “SP3day” with Modbus ADDR
= 0116, 0117:
SEZ50MB
Device
Address
Function
Code
Modbus Address Data Length CRC16 Check
Send
F7 03 00 74 00 02 90 87
SEZ50MB
Device
Address
Function
Code
Byte
Count
Status
(IEEE 754 format)
CRC16 Check
Respond
F7 03 04 41 E0 00 00
(SP3 day setpoint 28 °C)
79 F6
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 02 85 53
SEZ50MB
Device Address
Function Code Byte Count Status
(IEEE 754 format)
CRC16 Check
Respond
F7 04 04 42 48 00 00
(Application No. is 50)
92 00
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 00 98 AC
SEZ50MB
Device Address
Function Code Modbus Address Value CRC16 Check
Respond
F7 05 00 00 FF 00 98 AC
Note: Only two possibilities for Value above - 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 02 To below
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 CRC16
Check
Respond
F7 10 00 74 00 02 15 44
Function Code 0x03 à
Function Code 0x04 à
Function Code 0x05 à
Function Code 0x10 à