Installation manual
PSC1-C-10 Installation manual V2.6
Page 130 of 173
Version: 57E
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.
