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User Manual
GFK-1503F
References and Coil Checking
When the level of coil checking is set to "single", you can use a specific %M or %Q reference
with only one Coil, but you can use it with one Set Coil and one Reset Coil simultaneously.
When the level of coil checking is "warn multiple" or "multiple", each reference can be used
with multiple Coils, Set Coils, and Reset Coils. With multiple usage, a reference could be
turned On by either a Set Coil or a normal Coil and could be turned Off by a Reset Coil or by
a normal Coil.
Power Flow and Retentiveness
The following table summarizes how power flow to different types of coils affects their
reference. The states of retentive coils are saved when power is cycled or when the PLC goes
from Stop to Run mode. The states of non-retentive coils are set to zero when power is
cycled or the PLC goes from Stop to Run mode.
Type of Coil
Normally Open
Negated
Retentive
Negated
Retentive
Positive
Transition
Negative
Transition
SET
RESET
Retentive SET
Retentive
RESET
Continuation Coil ----<+>
A coil sets a discrete reference ON while it receives power flow. It is non-retentive;
therefore, it cannot be used with system status references (%SA, %SB, %SC, or %G).
Instruction Set Reference
Symbol
Power to
Coil
-( )-
ON OFF
-(/)-
ON OFF
-(M)-
ON OFF
-(/M)-
ON OFF
-(P)-
OFF→ON
-(N)-
ON→OFF
-(S)-
ON OFF
-(R)-
ON OFF
-(SM)-
ON OFF
-(RM)-
ON OFF
ON OFF
Result
Sets reference ON, non-retentive.
Sets reference OFF, non-retentive.
Sets reference OFF, non-retentive.
Sets reference ON, non-retentive.
Sets reference ON, retentive.
Sets reference OFF, retentive.
Sets reference OFF, retentive.
Sets reference ON, retentive.
If power flow into the coil was OFF the previous
sweep and is ON this sweep, sets the coil ON.
If power flow into the coil was ON the previous
sweep and is OFF this sweep, sets the coil ON.
Sets reference ON until reset OFF by ( R ), non-
retentive.
Does not change the coil state, non-retentive.
Sets reference OFF until set ON by (S), non-
retentive.
Does not change the coil state, non-retentive.
Sets reference ON until reset OFF by (RM),
retentive.
Does not change the coil state.
Sets reference OFF until set ON by (SM)-,
retentive.
Does not change the coil state.
Sets next continuation contact ON.
Sets next continuation contact OFF.
Chapter 10
Jan 2020
156
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