Modbus-Rtu Easy Master Function - Omron CP1L CPU UNIT - 03-2009 Operation Manual

Serial Communications
Note
6-3-3

Modbus-RTU Easy Master Function

Overview
A setting can be made to delay the transmission of data after the execution of
TXD(236).
Execution of TXD(236)
Refer to the SYSMAC CP Series CP1L CPU Unit Programming Manual
(W451) for more details on TXD(236) and RXD(235).
If an RS-232C or RS-422A/485 Option Board is used, the CP1L CPU Unit can
function as a Modbus-RTU Master to send Modbus-RTU commands by
manipulating software switches. This enables easily controlling Modbus-com-
pliant slaves, such as Inverters, through serial communications.
The following OMRON Inverters support Modbus-RTU slave operation:
3G3JV, 3G3MV, and 3G3RV.
The communications mode in the PLC Setup must be set to the Gateway
Mode to enable this functionality.
Delay time
Transmission
Time
Section 6-3
371