Chapter 6 Communication Setting; Setup Method For Modbus Serial Communication; Using The Cpu Module - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

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COMMUNICATION SETTING
This chapter explains the setup method for using MODBUS serial communication with an FX5.
6.1

Setup Method for MODBUS Serial Communication

For the MODBUS serial communication setting of the FX5, set parameters with GX Works3.
Setting of parameter differs according to the module used. The procedure for each module is as follows.

Using the CPU module

"Navigation window"  [Parameter]  [FX5UCPU]  [Module Parameter]  [485 Serial Port]
Window
The following screen will be displayed if "MODBUS_RTU Communication" is set for Communication Protocol Type.
■Basic Settings
Item Setting
Communication Protocol Type When using this function, select "MODBUS_RTU Communication".
Parity Bit None, Odd, Even
Stop Bit 1bit, 2bit
Baud Rate 300bps, 600bps, 1200bps, 2400bps, 4800bps, 9600bps, 19200bps, 38400bps,
57600bps, 115200bps
■Fixed Setting
Item
*1
Host Station No.
Slave Response Timeout
*2
Broadcast Delay
Message to Message Delay
Timeout Retry Count Setting
*1 When set to "Latch" by SM/SD Setting, setting values of the Host Station No. can be changed through special registers. (Page 31
Latch Setting) When other than 0 is set for the special register of a channel that is already set as a master station (station number: 0) by
parameter, the channel does not function as a slave station. In addition, when 0 is set for the special register of a channel that is already
set as a slave station (station number: 1 to 247) by parameter, the channel does not function as a master station.
*2 Set master station side broadcast delay as equal to one or more scan times of the slave station.
Setting
0 to 247 (Master station: 0, Slave station: 1 to 247)
1 to 32767 ms
1 to 32767 ms
1 to 16382 ms
0 to 20
Corresponding station
Master/Slave
Master/Slave
Master/Slave
Master/Slave
Master/Slave
6 COMMUNICATION SETTING
6.1 Setup Method for MODBUS Serial Communication
Corresponding station
Master/Slave
Master/Slave
Master/Slave
Master/Slave
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