Chapter4 Modbus(R) Standard Functions; Modbus(R) Standard Function Support List - Mitsubishi QJ71MB91 User Manual

4
MODBUS(R) STANDARD FUNCTIONS

CHAPTER4 MODBUS(R) STANDARD FUNCTIONS

This chapter explains the MODBUS
Using the MODBUS
controller CPU devices and to load the QJ71MB91 status into the master.

4.1 MODBUS(R) Standard Function Support List

(1) MODBUS
Function
Sub-function
code
code
(Sub code)
01 -
02 -
03 -
04 -
05 -
06 -
07 -
4
- 1 4.1 MODBUS(R) Standard Function Support List
standard functions allows you to read/write to programmable
standard function support list
The following table indicates a list of the MODBUS
the QJ71MB91.
Table4.1 MODBUS
Function
Reads the status (ON/OFF) of one or
Read coils
more coils.
Reads the status (ON/OFF) of one or
Read discrete inputs
more inputs.
Reads the values of one or more
Read holding registers
holding registers.
Reads the values of one or more input
Read input registers
registers.
Write single coil Writes a value (ON/OFF) to one coil.
Write single register Writes a value to one holding register.
Read exception status Reads error status.
standard functions supported by the QJ71MB91.
standard function support list
Description
standard functions supported by
Accessible
devices
Broadcast Reference
per
message
1 to
2000 points
1 to
2000 points
1 to
125 points
1 to
125 points
1 point
1 point
-
(Continued on next page)
Section
4.4
Section
4.5
Section
4.6
Section
4.7
Section
4.8
Section
4.9
Section
4.10