Allen-Bradley 442L-SFZNMN, Руководство пользователя

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Rockwell Automation Publication 442L-UM005B-EN-P - April 2017 29
Configurable Functions Chapter 3
Stand-by
If, in mobile applications, vehicles are not moved for a time, the OSSDs can be
switched to the OFF state and the laser on the SafeZone Mini device can be
switched off. In this way, the power consumption of the device is reduced.
OSSDs
Internal OSSDs
If there is an object in the protective field, the internal OSSDs on the SafeZone
Mini device always switch. This response cannot be configured differently in
the SCD software.
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 SafeZone
Mini device checks the contactors after each interruption of the protective
field and before the machine restart. The EDM can so identify if one of the
contactors has welded, for instance. In this case, the external device monitoring
places the system in a safe operational state and the OSSDs are not switched
back to the ON state.
Figure 6 shows how the SafeZone Mini device reacts if the external device
monitoring detects a contactor malfunction:
Table 6 - Behavior of the SafeZone Mini Device on a Contactor Malfunction
IMPORTANT
Use this function if, for example, you use several vehicles and do not move
them for a time. The SafeZone Mini device remains in the stand-by mode as
long as the related input information is present.
Without internal restart interlock or with restart delay • The system locks completely (lockout).
• The error message 8 appears in the seven-segment
display.
With restart interlock • The SafeZone Mini device switches its OSSDs to the
OFF state.
• The status indicator is illuminated.
• The error message appears in the seven-
segment display.
You can configure the external device monitoring in the SCD software.
TIP Examples of the connection of external device monitoring can be found in
Connection Diagrams on page 66 .
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