HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 144 of 189
Version: 50F
7.3.3.1 Example reset function with protection against incorrect usage
Function:
On a machine, the hazard area is to be protected in normal operation by a
guard and in the setting up mode by an enable button in conjunction with standstill
monitoring and safely limited speed.
The presence of the guard is monitored by an electrical sensor. If the guard is open,
movement is only possible with the enable button actuated.
In the program this aspect is realised by a "Safety door" function (2-channel with time
monitoring) and an "Enable" function.
The "Safety door" logic signal is generated using input pre-processing with
complementary inputs and time monitoring. The time monitoring for this element is
fixed at 3 seconds.
If the safety door is open ("LOW" signal), the axis can be moved at reduced speed if
enabling is active.
Problem:
If a "cross-circuit" fault is simulated on the safety door input, the PSC1 module
indicates the alarm 6701.
This alarm can be acknowledged and the "safety door" signal correctly remains at "0".
After the time monitoring of 3 seconds has elapsed, alarm 6701 is triggered again.
If the enable is pressed during this period, the axis can be moved again for 3 seconds.
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