External Device Monitoring Function - Omron F3SJ-E N25 Series User Manual

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External Device Monitoring Function

Easy Type
Basic Type (basic system)
Basic Type (muting system)
The external device monitoring function cannot be used when the muting system is used.
This function detects malfunctions, such as welding, in external relays (or contactors) that control the
hazardous part of a machine.
This function constantly monitors that a specified voltage is applied to the receiver's external device
monitoring input line, and the system enters lockout state when an error occurs. The relay's
operational delay can be up to 0.3 s without being evaluated as an error.
For example, if the normally closed N.C. contact does not close within 0.3 s after the safety outputs
turn from ON to OFF, and a specified voltage is not applied to the external device monitoring line , it is
evaluated as an error and the system enters a lockout state.
To utilize this function properly, use safety relays and contactors that have force guided or
mechanically linked contact structure.
 Wiring
Perform wiring so that a voltage of 0 V to 3 V is applied to the external device monitoring line via the
external relay's normally closed N.C. contact.
When external device monitoring is not being used, apply the auxiliary output to the external device
monitoring input.
Wiring for external device monitoring function p.14
 Timing chart
The sensor reads out a device monitoring input value a minimum of 0.5 s after the power of the F3SJ-
B is turned ON. If the status of the safety outputs is changed back to the original status within the
allowable delay time, the F3SJ-B will not enter the lockout state.
Unblocked
Unblocked
Blocked
/Blocked
ON
Safety output
OFF
ON
External device
OFF
monitoring input

T = 0.3 s Within 0.3 s
System Configuration and Functions
0.3 s
Lockout
E
F3SJ-E/B
23
User's Manual