GE VersaMax PLC, User Manual

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Type of Coil Symbol
Power to Coil Result
Negative Transition -(N)-
ON→OFF
If power flow into the coil was ON the previous
sweep and is OFF this sweep, sets the coil ON.
SET
-(S)-
ON
OFF
Sets reference ON until reset OFF by ( R ),
non-retentive.
Does not change the coil state, non-retentive.
RESET
-(R)-
ON
OFF
Sets reference OFF until set ON by (S),
non-retentive.
Does not change the coil state, non-retentive.
Retentive SET
-(SM)-
ON
OFF
Sets reference ON until reset OFF by (RM),
retentive.
Does not change the coil state.
Retentive
RESET
-(RM)-
ON
OFF
Sets reference OFF until set ON by (SM)-,
retentive.
Does not change the coil state.
Continuation Coil ——<+>
ON
Sets next continuation contact ON.
Sets next continuation contact OFF.
OFF
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).
Example
In the example, coil E3 is ON when reference E1 is ON and reference E2 is OFF.
E1 E2 E3
10.7.2.3 Negated Coil
A negated coil sets a discrete reference ON when it does not receive power flow. It is not
retentive, so it cannot be used with system status references (%SA, %SB, %SC, or %G).
Example
In the example, coil E3 is ON when reference E1 is OFF.
E1 E2
E2 E3
10.7.2.4 Retentive Coil
Like a normally open coil, the retentive coil sets a discrete reference ON while it receives
power flow. The state of the retentive coil is retained across power failure. Therefore, it
cannot be used with references from strictly non-retentive memory (%T).
10.7.2.5 Negated Retentive Coil
The negated retentive coil sets a discrete reference ON when it does not receive power
flow. The state of the negated retentive coil is retained across power failure. Therefore, it
cannot be used with references from strictly non-retentive memory (%T).
176 GFK-1503E VersaMax PLC User Manual
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