Function Code - Fuji Electric PXG-9 Communication Instruction Manual

Function Code

For MODBUS protocol, coil numbers or resistor numbers are assigned by the function code, and each function code
only works for the assigned coil number or resistor number.
The correspondence between the function code and the coil number or resistor number is as follows.
Function Code
Code Function
02 Read (continuous) Input relay
H
03 Read (continuous) Hold resistor
H
04 Read (continuous) Input resistor
H
06 Write Hold resistor
H
10 Write (continuous) Retention resistor
H
The message length for each function is as follows.
Code Contents
02 Read bit data (read-only)
H
03 Read word data
H
04 Read word data (read-only)
H
06 Write word data
H
10 Continuously write word data
H
* 1: "Assignable Data Number" above is limited by the data number that the micro controller assigned to the coil number or
address number.
(Excluding function code 06
Target
Command Message
Assignable
Data Number
Minimum
* 1
8 bit
* 1
60 words
* 1
37 words
1 word
* 1
60 words 11
).
H
Coil Number, Resistor Number
Number Contents
1xxxx Read bit data
3xxxx Read word data
4xxxx Read/write word data
[unit: byte]
Response Message
Maximum Minimum Maximum
8 8 6
8 8 7
8 8 7
8 8 8
129 8
– 23 –
6
125
79
8
8
Chapter
5