Overview

Remote Diagnostic Modbus (RDM) module supports Modbus communication and one digital output (DO). It is used to provide diagnosis indications remotely for contactors with a control module with commercial references ending with LSEMC, including:

• main contact wear diagnosis

• coil over-temperature

• coil over-voltage and under-voltage

• control module internal malfunction

• contactor operating times

It can record the latest five diagnosis events. See Diagnosis Functions.

The table below provides the compatibility of the RDM module with contactors and control modules:

Hardware Description

Label	Description
A	Plug to the contactor
B	Unlock trigger
C	Terminal block for digital output, RDM power supply and Modbus communication port
D	LED indicator
E	Modbus address tens-digit knob
F	Modbus address ones-digit knob
G	Baud rate and parity setting knob

LED Indicator

LED status	Color	Indication
On	Green	Initial idle state after RDM module is powered on. No request received.
	Orange	RDM module is powered on and a Modbus error is detected. See Troubleshooting for more details.
	Red	RDM module is not powered and a Modbus error is detected. See Troubleshooting for more details.
Blinking	Green and orange	RDM module is powered on, and Modbus communication is ongoing without error. If a Modbus exception code is returned, see Troubleshooting for more details.
Off	-	RDM module is powered off.