5. Safety-related function
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i. -|Transparent setting guide|-
5.3
External Device Monitoring (EDM)
This function monitors the state of external devices (e.g. safety relay, connectors, etc) connected to the OSSD output.
It also diagnoses contact welding and malfunction of external devices to control a hazardous source.
The input of external device monitoring (EDM) must be applied as opposed to the state of OSSD output, and interprets
abnormalities based on the input state when the OSSD output is switched.
If the rated voltage is not supplied to the EDM input within the timeout (T1) after the OSSD output is switched, entering
lockout condition.
•
Timing chart of EDM input
OSSD
EDM
Light curtain
Clear
Blocked
ON
OFF
ON
OFF
T1
T1
T1
※1
Lockout
T
OFF
T
ON
T1
T1: Timeout
T
ON,
T
OFF
: OSSD response time
※
1: If the OSSD is switched within the timeout (T1), light curtain operates normally though the signal is not applied
to the EDM input.
5.3.1 Wiring
NPN output
PNP output
(Brown)+24VDC
K1
K2
(Orange)EDM input
(Blue)0V
Receiver
K1
K2
Receiver
(Brown)+24VDC
(Orange)EDM input
(Blue)0V
※
Install external relay (K1, K2) for EDM input and use normally closed (N.C.) contacts switch for the rated voltage.
※
Be sure to use a magnetic contactor or external relay with force-guided contacts as the K1 and K2 for proper usage.
5.3.2 Change settings
You can change settings via setting switch or atLightCurtain. Only SFLA (advanced type) support atLightCurtain to change
settings.
Function
Setting item
Setting range
Factory default
Setting method
atLightCurtain
Setting switch (pin no.)
EDM
EDM function
Enable/Disable
Disable
○
○(6)
Timeout(T1)
0.1 - 4sec
0.3sec
-
※
When the function is activated by the setting switch, the setting range is the factory default.
※
The EDM function should be activated by the setting switch or atLightCurtain to monitor the EDM indicator on the
receiver. If not, the indicator doesn't show the status of EDM.
※
For more information on error and warnings, see "11. Troubleshooting".
