Mitsubishi QJ71MB91 User Manual

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4.1 MODBUS(R) Standard Function Support List
4
MODBUS(R) STANDARD FUNCTIONS
CHAPTER4 MODBUS(R) STANDARD FUNCTIONS
This chapter explains the MODBUS standard functions supported by the QJ71MB91.
Using the MODBUS standard functions allows you to read/write to programmable
controller CPU devices and to load the QJ71MB91 status into the master.
4.1 MODBUS(R) Standard Function Support List
(1) MODBUS standard function support list
The following table indicates a list of the MODBUS standard functions supported by
the QJ71MB91.
(Continued on next page)
Table4.1 MODBUS standard function support list
Function
code
(Sub code)
Sub-function
code
Function Description
Accessible
devices
per
message
Broadcast Reference
01 - Read coils
Reads the status (ON/OFF) of one or
more coils.
1 to
2000 points
Section
4.4
02 - Read discrete inputs
Reads the status (ON/OFF) of one or
more inputs.
1 to
2000 points
Section
4.5
03 - Read holding registers
Reads the values of one or more
holding registers.
1 to
125 points
Section
4.6
04 - Read input registers
Reads the values of one or more input
registers.
1 to
125 points
Section
4.7
05 - Write single coil Writes a value (ON/OFF) to one coil. 1 point
Section
4.8
06 - Write single register Writes a value to one holding register. 1 point
Section
4.9
07 - Read exception status Reads error status. -
Section
4.10

Mitsubishi QJ71MB91 Specifications

General

Brand	Mitsubishi
Model	QJ71MB91
Category	Controller
Language	English