Write Multiple Registers - Function Code 16 - ABB COMMANDER 100 Operating Manual

...5 MODBUS FUNCTIONS
5.6 Write Multiple Registers – Function Code 16
5.6.1 Write Multiple Registers Query
This message is used to change the contents of up to eight holding registers at a
time. When used with slave address zero (broadcast mode) all slave controllers
load the selected registers with the contents specified.
Note. To write to a register, its offset address (one less than the register
number) must be used, e.g. to write to register 25, the offset address 24 (18H)
is transmitted.
Example. Write the value 500 to the register address 25 (proportional band 1 –
heat) and the value 100 to the register address 26 (integral action time) in slave 01.
Address Function
01 10
Holding
Register 24 Register 24
High
01
5.6.2 Write Multiple Registers Response
The Write Multiple Registers Response confirms slave identification, function code,
starting register address and quantity only.
Example
Address Function
01 10
14
Register
Start
Offset High
00
Holding Holding
Register 25
Low High
F4 00
Register
Start Offset
High
00
Register
Start
Offset Low
18
Holding
Register 25
Low
64
Register Number of
Start Offset Registers
Low
18 00
Number of
Registers
00 02
Error Check
Field (CRC16)
B2
Error
Check (CRC-16)
Field
02 C1
Byte
Count
04
E0
CF