PLC sequential shift test program interpretation, and soliciting new methods - Database & Sql Blog Articles

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To be honest, I haven't used plc for several years; now I see a previous test procedure that looks quite "spoken", see Figure 1. The program was originally compiled with GXDeveloper, FX2N; now it is compiled with Delta WPLSoft 2.12, ES2.
The requirements of this program are: realize the sequential shift of Y1 ~ Y5, and can cancel a certain bit or some bits arbitrarily; that is, if Y2 is canceled, after Y1 is turned on, Y1 is turned off and Y3 is turned on after the condition is satisfied. Instead of Y2 turned on.
This may be because the preparation for the preparation of a program at the time should be similar in the program (the original program was not retained). For example, five processing stations allow only one process at a time. If a station is not ready, skip the station.
The method of the program seems to be not very smooth - how to program it to achieve this function?


After re-reading the program, the programming idea is: If you cancel a bit, shift to the bit and move it to one bit.
For the convenience of description, the step number next to the left busbar of the ladder diagram is "line number" (line block number).
Attached, the interpretation of the procedure of Figure 1:

Line 0: Turn on X0 once, T0 delays for 1 second to turn on, even if the X0 signal is jittery, it will not give the signal multiple times; this is another way to prevent external contact jitter. T0 is turned on once, and M31 to M36 are shifted to the left by one.
Line 8: gives the shifted initial signal M10.
Line 10: Reset M10 after M31 is turned on.
Line 14: Shift instruction, realize one bit shift of M31~M36; M1 has no effect here.
25 lines: When the next cycle, M31 is set, that is, M31 and M36 are simultaneously turned on.
Line 27: Reset M31, at this time M32 is turned on, still realize that M31 and M36 are connected at the same time.
Lines 33-53: Generate a shift signal of D10.
Line 58: D10 is assigned an initial value.
Line 64: Implement the shift of D10.
Lines 75 to 114: If a bit is canceled, the bit is removed.
For example, if Y2 is canceled (Y1 is turned on and directly turned to Y3 is turned on), then X2 is turned on;
Let Y1 be turned on first (M31 and so on). At this time, after a shift signal, M32 is turned on, 38 lines are executed, M62 signal is generated (M62 pulse is turned on), and one bit is shifted in 64 lines D10; When D10 everyone is 0000000000000100;
Since M62 is turned on and X2 is turned on, when it is executed to 88 lines, D10 is shifted by one bit, and the result is 0000000000001000; the subsequent program is executed to make M93 turn on and Y3 turn on.
Line 127: If the fifth digit is canceled, D10 is assigned an initial value.
Line 138: When D10 shifts to above b6, the initial value is assigned to D10.
Line 148: Send the value of D10 to K2M90 (M90~M105) for control purposes.
Lines 154 to 166: The purpose of control of Y1 to Y5 is achieved.
Line 169: The program ends.

The program only gives an idea, not a utility; after the program is transplanted (and 138 lines and 127 lines of instruction positions are exchanged), it has not been tested.
For example, it seems rough, when a bit is canceled and D10 performs an "extra" shift, then M31 ~ M36 do not shift accordingly; the possible method is to return the content of D10 to M31 ~ M36.