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User Manual
GFK-1503F
Negative Transition Coil
If the reference associated with this coil is OFF, when the coil stops receiving power flow the
reference is set to ON until the next time the coil is executed.
Do not write from external devices to references used on negative transition coils since it
will destroy the one-shot nature of these coils.
Transitional coils can be used with references from either retentive or non-retentive
memory (%Q, %M, %T, %G, %SA, %SB, or %SC).
Example
In the example, when reference E1 goes from OFF to ON, coils E2 and E3 receive power flow,
turning E2 ON for one logic sweep. When E2 goes from ON to OFF, power flow is removed
from E2 and E3, turning coil E3 ON for one sweep.
Figure 145
SET Coil
SET and RESET are non-retentive coils that can be used to keep ("latch") the state of a
reference either ON or OFF. When a SET coil receives power flow, its reference stays ON
(whether or not the coil itself receives power flow) until the reference is reset by another
coil.
RESET Coil
The RESET coil sets a discrete reference OFF if the coil receives power flow. The reference
remains OFF until the reference is set by another coil. The last-solved SET coil or RESET coil
of a pair takes precedence.
Example
In the example, the coil represented by E1 is turned ON whenever reference E2 or E6 is ON.
The coil represented by E1 is turned OFF whenever reference E5 or E3 is ON.
Figure 146
Instruction Set Reference
Chapter 10
Jan 2020
158
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