User Documentation

4 System description of safe power-feed modules | Transition diagramm
17u-remote IP20 modules for functional safety manual 1484600000/07/11.2020
4.2 Transition diagramm
State 2
Wait for start
24 VSafe off
SS1 off
State 4
Running
24 VSafe on
SS1 on
Safety circuit active
1
Autostart mode, not after power on
Safety circuit active
2
Manual start mode
Safety circuit inactive
3
no delay
Manual start
key pressed
Delay time
expired
Safety circuit active
1
Manual start mode or autostart mode after power on
Safety circuit inactive
3
Safety circuit active
1
Autostart mode
Safety circuit inactive
3
delay
State 1
Idle
24 VSafe off
SS1 off
State 3
Wait for power off
24 VSafe on
SS1 off
1) Both channels of a safety circuit must get active within a discrepancy time of 0.5 s max.
2) The 24 V Safe output remains on until delay time is expired.
3) At least one channel of the safety circuit.
Transition diagramm of safe power-feed modules
With the delay SIL module (UR20-PF-O-2DI-DELAY-SIL)
switching off can be delayed by a dened time so that,
for example, a machine can be shut down in a controlled
manner. The delay time can be set in four steps between
0 and 60 seconds (corresponds to stop category 1 as per
EN60204).