Function blocks
251
1SVC 440 795 M1100
Coils
• T 01EN to T 32EN: Trigger coil;
• T 01RE to T 32RE: Reset coil;
• T 01ST to T 32ST: Stop coil.
Memory requirement of the timing relay
The time relay function block requires 48 bytes of memory
plus 4 bytes per constant on the function block input.
Retention
Timing relays can be run with retentive actual values. The
number of retentive timing relays can be selected in the
SYSTEM r RETENTION menu.
If a timing relay is retentive, the actual value is retained
when the operating mode is changed from RUN to STOP and
when the power supply is switched off.
When display system is restarted in RUN mode, the timing
relay continues with the retentively stored actual value. The
state of the trigger pulse must correspond to the function of
the timing relay.
Signal 1 when:
•On-delayed,
• Single pulse,
• Flashing.
Signal 0 for off-delayed.
Function of the timing relay function block
Timing relay, on-delayed with and without random
switching
Random switching:
The contact of the timing relay switches randomly within the
setpoint value range.
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