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6

6.3

Extension Safety Relay Module

6.3.1

Error check method with LED

Table 6.5 shows description, cause investigation, and corrective action of errors 
depending on LED display on the module.

: ON,  : Flash,  : OFF, *: ON or OFF

 * 1: The status that start-up processing has been performed to the module

Normal (before start-up)

-

Normal (started up)

-

*

*

The module power supply is not normally 
supplied.

•Check if the power supply is normally 

supplied.

•Check between the power supplies for 

short.

•In case of input N type, check between 

the dual inputs for short.

*

*

Contact welding of K0 and K1 relays

•Replace the module.

K0 and K1 relays do not turn ON.

*1

Safety system 1 does not turn ON.

*1

Safety system 2 does not turn ON.

*1

Safety system 1 does not turn OFF.

*1

Safety system 2 does not turn OFF.

*1

*

*

*

*

*

*

•System error occurred.
•The safety power supply is not normally 

supplied.

•Check if the power supply is normally 

supplied.

•Check between the power supplies for 

short.