Write Multiple Registers - Function Code 16; Write Multiple Registers Query; Write Multiple Registers Response - ABB C1900 Installation Manual

...5 MODBUS FUNCTIONS
5.6 Write Multiple Registers – Function Code 16
5.6.1

Write Multiple Registers Query

Holding registers existing within the controller can have their contents changed by this message (a maximum of 8 registers).
When used with slave address zero (broadcast mode) all slave controllers load the selected registers with the contents specified.
– a write multiple register request to write the value 10 to the register address 121 and the value 100 to the register
Example
address 122 in slave 01 is shown below.
Register
Start
Address Function
Offset
High
01 10 00
5.6.2

Write Multiple Registers Response

The response confirms slave identification, function code, starting register address and quantity only.
:
Example
Address Function
01 10
12
Register
Number
Start Byte
of
Offset Count
Registers
Low
78 00 02
Register Start Register Start
Offset High Offset Low
00 78
Holding Holding
Register Register Register
121 High 121 Low
04 00 0A
Number of Registers
00 02
Holding Holding
Error Check Field
Register
122 High 122 Low
00 64 D4
Error Check Field (CRC-16)
00 10
(CRC-16)
C4
90