KEYENCE GL-RHG Series - Manual (Page 30)

2-6 GL-RHG-M-NO2-E
Fu
nct
ion
s and
Feat
ures
2
2-4
External Device Monitoring (EDM Function)
EDM (External Device Monitoring) is a function of the GL-RHG that monitors the state of the control
devices which are externally connected to the GL-RHG. The GL-RHG can detect a fault, such as welded
contacts on external devices, as long as the EDM function is activated.
See
"Functions" (page 2-4) for the information of wiring system and cable type to activate this function.
Wiring
Reference When using the 11-core cable and not using the EDM function, short-circuit the EDM input to AUX
output (Red wire on the receiver).
"4-5 Examples of Wiring" (page 4-7)
Time chart
(1) If the GL-RHG detects the operation of the external devices within the specified period of time (0.3 s)
after the operation of OSSD (ON to OFF, or OFF to ON), the GL-RHG continues normal operation.
(2) Unless the GL-RHG detects the operation of an external device within the specified period of time
(0.3 s) after the operation of OSSD (ON to OFF, OFF to ON), the GL-RHG goes into an error condi-
tion due to an EDM error.
When using a PNP output type cable When using an NPN output type cable
Brown
Red/Black
Blue
GL-RHG
Receiver
+24 V
0 V
Device 1
Device 2
Short-circuit current: 10 mA
Brown
Red/Black
Blue
GL-RHG
Receiver
+24 V
0 V
Device 1
Device 2
Short-circuit current: 10 mA
GL-RHG
OSSD
External device
(B contact)
Response time (ON to OFF) Response time (ON to OFF)
Error condition
Specified
period of time
0.3 s
Specified
period of time
0.3 s
(1) (2)
Clear
Blocked
ON
OFF
ON
OFF