» » MCR : Master Control Relay On/Off

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Symbol


MCR<
MCR On

The Master Control Relay On (MCR<) instruction triggers an operation that saves the RLO in the MCR stack and opens an MCR zone. The instructions shown in MCR Instructions are influenced by this RLO that is saved in the MCR stack when the MCR zone is opened.

The MCR stack works like a LIFO (Last In, First Out) buffer. Only eight entries are possible. If the stack is already full, the Master Control Relay On instruction produces an MCR stack error (MCRF).


Symbol


MCR>
MCR Off

The Master Control Relay Off (MCR>) instruction closes the MCR zone that was opened last. The instruction does this by removing the RLO entry from the MCR stack. The RLO was saved there by the Master Control Relay On instruction. The entry released at the other end of the LIFO (Last In, First Out) MCR stack is set to
1.

If the stack is already empty, the Master Control Relay Off instruction produces an MCR stack error (MCRF).




MCR-Stack



The MCR is controlled by a stack which is one bit wide and eight entries deep. The MCR is activated as long as all eight entries in the stack are equal to 1. The MCR< instruction copies the RLO to the MCR stack. The MCR> instruction removes the last entry from the stack and sets the released stack address to 1.



If an error occurs, for example, if there are more than eight MCR> instructions in succession, or you attempt to execute the instruction MCR> when the stack is empty, the MCRF error message is activated.
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