7.9.1
External device monitoring (EDM)
The EDM checks if the contactors actually de-energize when the protective device is
tripped. If you activate external device monitoring, then the safety laser scanner checks
the contactors after each interruption of the protective field and prior to the machine
restart. External device monitoring is then able to detect if one of the contactor’s con‐
tacts is welded, for instance. In this case the external device monitoring places the sys‐
tem in a safe operational status and the OSSDs are not switched back to the ON state.
The table shows how the device reacts if the external device monitoring detects a con‐
tactor malfunction:
Table 20: Behavior of the device on a contactor malfunction
Without internal restart
interlock or with restart
delay
•
The system locks completely (lock-out).
•
The error message
appears in the 7-segment display.
•
The safety laser scanner switches its OSSDs to the OFF state.
•
The LED
Ê
is illuminated.
•
The error message
appears in the 7-segment display.
External device monitoring can be configured in the CDS.
NOTE
b
If the external device monitoring function is not being used, leave the inputs dis‐
connected.
Further topics
•
"Connection diagrams", page 50
•
7.10
Restart
Overview
You can configure the restart behavior as follows:
•
•
With restart delay
•
The type of restart can be configured in the CDS.
Important information
DANGER
Hazard due to unexpected starting of the machine
If the protective field can be exited in the direction of the hazardous point, e.g., to areas
that are unprotected due to the method of mounting or the near range of the safety
laser scanner, the machine could restart while a person is in the hazardous area.
b
It is imperative that you configure the safety laser scanner with restart interlock if
the protective field can be exited in the direction of the hazardous point or if a per‐
son cannot be detected by the safety laser scanner at every point in the hazardous
area.
CONFIGURATION
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8010948/ZA21/2020-06-18 | SICK
O P E R A T I N G I N S T R U C T I O N S | S300
85
Subject to change without notice
