The FX2N has a total of 27 fundamental logic instructions, including 20 fundamental logic instructions of some sub-series PLCs.
Master Control Command (MC/MCR)
(1) MC (Master Control Command) is used for the connection of common series contacts. After the MC is fulfilled, the left bus is moved to the back of the MC contact.
(2) MCR (Master Reset Instruction) It is the reset instruction of the MC instruction, that is, the MCR instruction is used to restore the position of the original left bus.
It is often the case that multiple coils are controlled by one or a group of contacts together, and if the same contacts are inserted in the control circuit of each coil, it will occupy a lot of memory cells, which can be handled by the master command. The application of MC and MCR instructions is shown in Figure 1, MC N0 M100 is used to complete the right shift of the left bus, so that Y0 and Y1 are under the control of X0, during which N0 indicates the nesting level, and the number of applications of N0 in the non-nested structure is unlimited; Use MCR N0 to restore the original left bus condition. If X0 is disconnected, the instructions between MC and MCR will be skipped and executed downward.
Instructions for the use of MC and MCR commands:
1) The target components of the MC and MCR directives are Y and M, but special auxiliary relays cannot be used. MC accounts for 3 program steps, MCR accounts for 2 program steps;
2) The main control contact is perpendicular to the general contact in the ladder diagram (as shown in M100 in Figure 3-22). The main control contact is a normally open contact connected to the left bus, which is the master switch that controls a group of circuits. Contacts connected to the master contacts must be commanded by LD or LDI.
3) When the input contact of the MC command is disconnected, the product timer, counter, and components driven by the reset/set command in the MC and MCR remain unchanged. For non-cumulative timers and counters, the components driven by the OUT command will be reset, as shown in Figure 3-22, when X0 is disconnected, Y0 and Y1 will become OFF.
4) If the MC instruction is used in an MC instruction area, it is called nesting. The number of nested stages is mostly 8 levels, and the number is increased according to the order of N0→N1→ N2→N3→ N4→N5→N6→N7. |
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