Mcr controls



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tarix07.11.2018
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#78704

MCR Controls

Master Control Relays:


Use the MCR function to cause a portion of the logic to be bypassed. Use an ENDMCR function associated with the MCR to resume normal logic execution. An MCR causes all rungs between the MCR and its subsequent ENDMCR to be executed without power flow.

The MCR function has a name which identifies the MCR. This name is used again with an ENDMCR instruction. The MCR function has no outputs; there can be nothing after an MCR in a rung.

Unlike the JUMP instruction, MCRs can only occur in the forward direction. The ENDMCR instruction must appear after its corresponding MCR instruction in logic.
There are no parameters for the MCR function.



Jump Command
Use the JUMP instruction to cause a portion of the logic to be bypassed. The JUMP can be either a forward or a backward JUMP. Logic execution will continue at the LABEL specified.

The JUMP instruction is similar to an MCR, except that coils within the range of the JUMP are not executed with negative logic.

There are no parameters for the JUMP function.
· When the JUMP is active, all coils within its scope are frozen. This includes coils associated with timers, counters, latches, and relays.

· The JUMP instruction is always placed in columns 9 and 10 of the current rung line; there can be nothing after the JUMP instruction in the rung. Power flow jumps directly from the instruction to the rung with the named LABEL.



· To avoid creating an endless loop with forward and backward JUMP instructions, a backward JUMP must contain a way to make it conditional.

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