PDD200A101 3BHE019633R0101 Reduce the occupation of input points

When there are many input signals in the control system, PDD200A101 3BHE019633R0101 can use an encoder to encode the input signals, which are then led to the input end of the PLC. The internal program of the PLC is used to decode and recognize each input signal, greatly reducing the occupation of input points. The external wiring of PLC is shown in Figure 5. Due to the occurrence of garbled code in ordinary encoders when multiple signals are input simultaneously, an 8-wire to 3-wire priority encoder 74LS148 can be used. The priority of the signal can be set, and sometimes the encoder’s gating output and extension ends can also be connected to the PLC to reduce misjudgment in conjunction with the program. In addition, it is also important to note the matching problem of PDD200A101 3BHE019633R0101 level (between+5V of the signal circuit and+24V of the PLC) and the technical specifications required for signal recognition at the PLC input port (the range of driving current and voltage recognition). Sometimes, appropriate signal amplification and isolation circuits need to be added.

If the simulation adjustment upper limit value is reached (X1 is on), PDD200A101 3BHE019633R0101 will start timing immediately (5 seconds). Monitor X1 during the timing process. If X1 goes off again, turn off the timer and continue to simulate adjustment; If T4 timing is completed and X1 is still on, start a low speed (Y8 is on) and perform multi-stage speed adjustment. At the same time, timer T5 starts timing (3s) and the timing is complete. If X1 is still on, turn off this multi speed and start a lower speed (Y9), while timer T6 is timed (10s). After the timing is completed, if X1 still lights up, turn off Y9, and X0 will quickly turn on, entering the switching action program. During this two-stage multi-stage speed adjustment process, if X0 is on at any time, the corresponding multi-stage speed and timer will be turned off, and a switching action will be performed simultaneously, that is, entering the switching program. Similarly, if X1 goes out at any time, turn off the running multi speed and timer, and switch to analog adjustment.