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4

4.2

Start-up/off Check Function

This function is to start the system after making sure that status of the safety relay module 
and external device are normal.
When the safety relay and electromagnetic switch are connected, connecting the normally 
closed contacts to the start-up/off check terminal of the safety relay module inhibiting the 
start-up at a failure such as contact welding.

 • Connect normally closed contact of forcibly guided type electromagnetic 

switch to off check.

 • If connecting normally closed contact of electromagnetic switch other 

than forcibly guided type, contact separation of the electromagnetic 
switch cannot be detected.

 •  Wire the start-up/off check input so that the external wiring length can be 

50m (164.04 feet) or less.

 • The timing of safety input and start-up/off check are inconstant. 

Therefore, control using this timing cannot be made.

Safety relay 
module

Off check

Start-up 
command

Safety status

Safety 
output

Power, etc.

Electromagnetic 
switch 

Non-safety part

Start-up switch

Emergency stop 
switch

Light curtain,
etc.

The start-up switch turns on.

(Manual mode)

Short circuit

Open

Open

Short circuit

OFF

OFF

ON

ON

OFF

Short circuit

Open

Open

Short circuit

Activation state

Activation state

Safety output

Start-up input
(XS0-XS1)

Off check input

Safety input
(X0-COM), (X1-COM)