Panasonic GM1 - Modbus-RTU Master Communication

Registers correspond to each access type (function code)
Function
code
Access type Register
When the check box is
not selected
(Note 1)
When the check box is
selected
(Note 1)
1 Read Coils Holding register Input register
2 Read Discrete Inputs Input register Input register
3 Read Holding Registers Holding register Input register
4 Read Input Registers Input register Input register
5 Write Single Coil Holding register Holding register
6 Write Single Register Holding register Holding register
15 Write Multiple Coils Holding register Holding register
16 Write Multiple Registers Holding register Holding register
23 Read / Write Multiple Registers Holding register (Read/
W
rite)
Input register (Read)
Holding register (Write)
(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.
13.3 MODBUS
13-30 WUME-GM1RTXOP-01