Logic relay
circuit diagram cycle
229
1SVC 440 795 M0100
Example: switching in the next cycle
Start condition:
• I1, I2 switched on
•Q1 switched off.
This is the circuit diagram of a self-latching circuit. If I1 and
I2 are closed, the switching state of relay coil
ÄQ1 is latched
via contact Q1.
• 1st cycle: Inputs I1 and I2 are switched on. Coil
ÄQ1
picks up.
• Contact Q1 remains switched off since the logic relay
evaluates from left to right.
• 2nd cycle: The self-latching now becomes active. The
logic relay has transferred the coil states at the end of the
first cycle to contact Q1.
Example: Do not wire backwards
This example is shown in section “Creating and modifying
connections”. It was used there to illustrate how NOT to do it.
In the third circuit connection, the logic relay finds a
connection to the second circuit connection in which the first
contact field is empty. The output relay is not switched.
When wiring more than three contacts in series, use one of
the marker relays.
I1uI2----ÄQ1
Q1k
I1-Q4-i3o
z-----k
hI2-I4-ÄQ2
I1-Q4-i3-ÄM1
I2-I4-M1-ÄQ2
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