User Manual

Logical I/O blocks
General functions
19
242 | 353 CM110664en_07
Prio Use
1 Prio 1…5 Assumption: All information bits for priorities 1…5 are inactive.
Prio 6 Assumption: Priority 6 is not active.
[PrVal] Assumption: The [PrVal] output is set to
Off .
2 Prio 1…5 At least one of the information bits for priorities (1…5) is active again. The effective switch command
from priority (1…5) is Off .
Prio 6 Since the effective switch command for priority (1...5) does not cause a change in the [PrVal] output,
priority 6 remains inactive.
[PrVal] The output value [PrVal] remains at
Off .
3 Prio 1…5 The effective switch command from priority (1…5) switches from
Off to Stage 1 .
Prio 6 Priority 6 adopts the new present value [PrVal=Stage 1] and is set to active. At the same time, the
minimum switch-on time [TiOnMin] starts without waiting for the delay time [DlyOn].
Note: Entries for priorities (1…5) initialize only the minimum switch-on or switch-off times [TiOnMin]
and [TiOffMin] respectively, but not the switch-on and switch-off delays.
[TiOnMin] and [TiOffMin] times for which the timer has already started only take effect when all
priorities (1…5) are inactive, that is, when the [PrVal] will be determined by one of priorities (7…16).
[PrVal] Priorities 1…5 are reserved to implement safety functions, and are executed immediately, irrespective
of any priority 6 monitoring periods which may already be running.
The [PrVal] output is switched immediately from
Off to Stage 1 .
4 Prio 1…5 None of the information bits for priority entries (1…5) is active.
Prio 6 The minimum switch-on time [TiOnMin] is still active. Priority 6 adopts the new target value from
priority (7…16).
[PrVal] The effective switch command is determined from priority 6.
The [PrVal] output changes from
Stage 1 to Stage 2 .
Example: Effect of
priorities 1...5 on [PrVal]