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PLC program logic design

· KP + KP A】】. (GP + Kp1), where K Fell eleven dollars a ~ iv ~ ~ ~ Series logic of the pack ~ ~ ~ a ~ way of a ~ ~ [= 1,2,[link widoczny dla zalogowanych],3 ... n,[link widoczny dla zalogowanych], Ko = K ¨,[link widoczny dla zalogowanych], too, K2 of the logical expression is: fx1 = ( sB · K2 + K1) (SQ3 + K2) = (S. Kl + Kz) '(SQ4 + Kt) five. Obtained by covering the implementation of components of the logical expression = Kt. K2 + KI'K2f: Kt. K2 = Kt + K2 VI. Draw the circuit diagram according to the logical expression (Figure 1): If the Chart】 directly converted to ladder shown in Figure 2, then in the implementation,[link widoczny dla zalogowanych], we will find that KM is not action, because at the input has been received Relay x4 ∞ status, and the normally closed contacts disconnect the circuit at the state, just moving units into contact sB_ shown in Figure 4, without changes to the ladder you can solve the problem. VII. Will convert the ladder diagram (Figure 2) Figure 2 PLC and relay ladder contacts the line of the question, there are differences, therefore, in the schematic process of converting ladder should note the following aspects: 1. Broken to contact the handling of the Motor overload protection should be used as input PLC, did not like the relay contacts in series in the output line control circuit, because the relay contacts circuit, thermal protection circuit will prevent loss of control of self-protection function must be restarted before being run The PLC not the same, if the FR in the output circuit protection contact Chuan, although from the action point of view, it also allows Dianji stop running, but the PLC input is not receiving the overload signal, which continues to run PLC Neibu , the output does not cut off, once the cooling or for other reasons FR FR contacts so connected, the motor will start immediately, so easy to cause an accident, the correct connection shown in Figure 5. 3. Interlocking handle contacts: △ switch in the Y or a reversible boot control, or to prevent the same arc welding caused by short circuit, often joined the electrical interlock contacts into line by the relay ladder, in addition to Add in the soft chain ladder, the output of the loop in the chain should add hardware, shown in Figure 6. 4. Treatment of multi-touch control 39} one by one ... a KM2KM1 · off contact with moving the same way, the ladder did not change, moving into action sets off contact all contacts in the external input wiring Xue Figure 7 and more One of the control connection 5. Relay control and PLC as a stark contrast to the work; in the control relay contacts, each contact is between the state of mutual restraint. The PLC is the work of a serial loop scanning mode, at any one time, only one instruction, so by the relay circuit 40 to convert the ladder when the ladder program pay special attention to the order, otherwise an error. Figure 8 is part of the relay contacts lines can be seen from the circle button when you press the sB KI was electric and self-locking, in turn, have also energized. If the sequence in Figure 7, Ladder 9 to convert it not the case, when the X400 (sB) a signal input, M101 turns on and protect themselves, because the serial PLC scan cycle, then the next instruction (LDM101 , OUTMl02), then the string in the loop of the M1 coil MIO0 A pair of contacts did not turn on, when executed instruction M102 turns on, and then execute the following commands in turn until the last instruction END. When the PLC scan to complete one cycle, followed from the beginning of the second scan, when the implementation of the LD, MIO1, ANI, M102, because this time the coil M1 (】 1, M102 are in a connected state, the coil still no output MIO0 In other words MIO0 will never turn on, the ladder should be in the correct way to position the coil to move the coil M100 M101 and Ml02 Part one of a figure 8 circuit relay contacts Figure 9 Ladder 6. The user can direct cause harm to load, can not stop the signal as tight PLC input signals. but should bear in Canada for connecting external power way, to prevent the PLC failure load power cut off in time,[link widoczny dla zalogowanych], to ensure safety as shown in Figure】 0 S: tight Aberdeen Investigation-f l Figure 10 over the external compact power road is only about a method of canthal programming is replaced with PLc control relay contacts of a circuit design, especially in the transformation of old equipment with the PLC, this method can shows a lot of advantages, because the function of PlJ2 strong, there are a lot of set i ten other way _ not repeat them here,
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