6.7 MODBUS RTU Communication (For L40MR and L60MR
types)
6.7.1 Overview of Functions
- The MODBUS RTU protocol enables the communication between the FP-X0 and other devices
(including our FP-X, FP-e, Programmable display GT series and KT temperature control).
- Enables to have conversations if the master unit sends instructions (command messages) to slave
units and the slave units respond (response messages) according to the instructions.
- Enables the communication between the devices of max. 255 units as the master function and slave
function is equipped.
About MODBUS RTU
- The MODBUS RTU communication is a function for the master unit to read and write the data in slave
units communicating between them.
- There are ASCII mode and RTU (binary) mode in the MODBUS protocol, however, the FP-X0 is
supported with the RTU (binary) mode only.
Master function
- Writing and reading data for various slaves is available using the F145 (SEND) and F146 (RECV)
instructions.
- Individual access to each slave and the global transmission is possible.
Slave function
- If the slave units receive a command message from the master unit, they send back the response
message corresponding to the content.
- Do not execute the F145 (SEND) or F146 (RECV) instructions when the unit is used as a slave unit.
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