Modbus-Rtu Master Communication - Panasonic GM1 User Manual

13.3 MODBUS
Registers correspond to each access type (function code)
Function
code
1
2
3
4
5
6
15
16
23
(Note 1) The register to be used is changed according to whether the "Holding register data area overlay
and input register data area overlay" check box is selected.

13.3.4 Modbus-RTU Master Communication

The Modbus-RTU master function can be used to send commands to slave devices in the
following two ways.
1) When device object channel settings are used
● Transmission method based on slave initialization
● Transmission method based on channel settings
• Cyclic
• Rising edge
• Application (ModbusChannel function block)
2) When device object channel settings are not used (Note 1)
● A method by which a user program (ModbusRequest function block) generates and sends
commands
(Note 1) Device object registration is required.
The method in 1) is explained below.
13-30
Access type
Read Coils
Read Discrete Inputs
Read Holding Registers
Read Input Registers
Write Single Coil
Write Single Register
Write Multiple Coils
Write Multiple Registers
Read / Write Multiple Registers Holding register (Read/
Register
When the check box is
(Note 1)
not selected
Holding register
Input register
Holding register
Input register
Holding register
Holding register
Holding register
Holding register
Write)
When the check box is
(Note 1)
selected
Input register
Input register
Input register
Input register
Holding register
Holding register
Holding register
Holding register
Input register (Read)
Holding register (Write)
WUME-GM1RTXOP-01