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4.2 Start-up/off Check Function
4
FUNCTIONS
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.
Figure 4.2 Off check function
Figure 4.3 Timing chart
POINT
• 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 OpenOpenShort circuit
OFFOFF
ON
ON
OFF
Short circuit OpenOpenShort circuit
Activation stateActivation state
Safety output
Start-up input
(XS0-XS1)
Off check input
Safety input
(X0-COM), (X1-COM)