GE GFK-0804B manual Master Control Relay/End Coil Pair

4

Master Control Relay/End Coil Pair

The MCR/End coil pair can be used to turn off one or more outputs in the program, regardless of the state of any inputs or other conditional logic to those outputs. The rungs with the outputs to be controlled must be located between the Master Control Relay coil and its paired End coil in the program.

In the example below, the MCR and End MCR coil control the states of outputs C1 and O17. While the Master Control Relay coil receives power flow from its conditional logic (in the example, it is contact I1), all output coils within the MCR/End MCR pair go to 0.

Programming Software Instructions

If you are using the programming software, refer to the instructions on page 4-11.

Example and HHP Instructions

MCR	MCR
	Ladder Diagram
I1
	MCR
	C1
I2	O17

END

Timing Diagram

Input I1

Coil C1

Input I2

Output O17

End			END	46024
	Hand-held Programmer
START				I1
OUT		MoreMENU		F1 (MCR)
START
OUT		C1
START		I2
OUT		O17
OUT		MoreMENU		F3 (END MCR)

This is a Master Control Relay operation. When I1 is 0, the program till the END command operates normally.

When input I1 is 1, all outputs before the END are disabled.

4-14 Micro PLC Programmer's Guide ± April 1994 GFK-0804B