IAI America SCON-C - Manual (Page 61)

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 Detailed category 3/4 circuit example
Connect with
dedicated cable
At TP detection
T24V: Output
Bypass relay: OPEN
At TP not detected
T24V: Not output
Bypass relay: CLOSE
TP connection
detection
Controller
connector TP adapter TP connector
Emergency stop
switch
Enable switch Shell
System I/O
connector
Motor power
cutoff relay
Regulator
External emergency
stop circuit category 4
Emergency stop switch
Reset switch
Shell
Enable switch
Solenoid contactor Solenoid contactor
System I/O connector
(Safety unit connection)
DC bus
Short circuit reset switch
if category 3 should be
supported
Short circuit only
when category 3
should be
supported