Mitsubishi PLC master contact instructions-EEWORLD

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The master contact instruction includes two instructions: the master contact instruction (MC) and the master contact reset (MCR). Their functions are similar to the stack instruction in that they both use one contact to control a ladder diagram area. The difference is that the stack instruction uses a "stack" to establish a branch node (the branch point of the ladder diagram branch), while the master contact instruction uses an actual contact to create an area isolated by this contact. The figure shows the description of the master contact MC and MCR instructions. M100 in the figure is the master contact, which is the "checkpoint" of the ladder diagram area after the "energy flow" reaches the contact. Therefore, it is called "master control". The MC and MCR instructions need to be used in pairs. The MC instruction establishes a new bus, and the MCR instruction returns to the original bus. The MC instruction can be nested 8 layers. The "N0" in the MC instruction is the nesting number of the master contact (N0~7). When not nested, the number can all use N0, and there is no limit to the number of times N0 can be used.

MC MCR control instructions

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