ABB A43 User Manual

Communication with Modbus
2CMC48001M0201 103 A43/A44
Revision: C User Manual
9.2.2 Function Code 16 (Write multiple registers)
General Function code 16 is used to modify settings in the meter, such as date/time, to
control output and to reset values, such as power fail counter. It is possible to write
up to 123 consecutive registers in a single request. This means that several
settings can be modified and/or several reset operations can be performed in a
single request.
Request frame A request frame has the following structure:
Slave
Function
Start
No. of
Byte
Register
Error
Address
Code
Address
Registers
Count
Values
Check
Example of a
The following is an example of a request (set Date/Time to November 11, 2010,
request
12:13:14):
Slave address
0x01
Function code
0x10
Start address, high byte
0x8A
Start address, low byte
0x00
No. of registers, high byte
0x00
No. of registers, low byte
0x03
Byte count
0x06
Value of register 0x8A00, high byte
0x0A
Value of register 0x8A00, low byte
0x0B
Value of register 0x8A01, high byte
0x0B
Value of register 0x8A01, low byte
0x0C
Value of register 0x8A02, high byte
0x0D
Value of register 0x8A02, low byte
0x0E
Error check (CRC), high byte
0x8C
Error check (CRC), low byte
0x82
In this example the master sends a write request to the slave that has the
Modbus address 1. The first register to write is 0x8A00 and the number of
registers to write is 0x03. This means that the registers 0x8A00 to 0x8A02 are
written. Register 0x8A00 is set to the value 0x0A0B, and so on.

ABB A43 Specifications

General

Brand	ABB
Model	A43
Category	Measuring Instruments
Language	English