PLC控制中央空调程序


                     |
   |   |                                 |
   |   |                                 |
   |   |                                 |
   |X20 |                                 |
   +-I I-+                                 +
   |LJSDW|                                 |
   |   |                                 |
   |   |                                 |
   |   |                                 |
   |X21 |                                 |
   +-I I-+                                 +
   |LS  |                                 |
   |BUZU |                                 |
   |   |                                 |
   |   |                                 |
   |X22 |                                 |
   +-I I-+                                 +
   |LQS                                   |
   |BUZU                                  |
   |                                    |
   |                                    |
   |T41                                   |
 510 +-I I-+------------------------------------------------------[SET M8  ]+
   |   |                              ERROR |
   |   |                                 |
   |   |                                 |
   |   |                                 |
   |X11 |                                 |
   +-I I-+                                 +
   |OLLJB|                                 |
   |   |                                 |
   |   |                                 |
   |   |                                 |
   |X12 |                                 |
   +-I I-+                                 +
   |OLFSB                                  |
   |                                    |
   |                                    |
   |                                    |


稀释、待机
   |M2                                K24000|
 514 +-I I--------------------------------------------------------------(T20 )+
   |ZLEN                                  |
   |                                    |
   |                                    |
   |                                    |
   |M2  X17                                |
 518 +-I I---I I-+------------------------------------------------[SET M4  ]+
   |ZLEN LSDW |                           XISI |
   |      |                              |
   |      |                              |
   |      |                              |
   |M0     |                              |
   +-I/I-------+                              +
   |AUTO    |                              |
   |RUN    |                              |
   |      |                              |
   |      |                              |
   |M8     |                              |
   +-I I-------+                              +
   |ERROR                                  |
   |                                    |
   |                                    |
   |                                    |
   |M4                           P        |
 523 +-I I-+------------------------------------------------[MOV T20  D20 ]+
   |XISI |                              XISI |
   |   |                              TIME |
   |   |                                 |
   |   |                                 |
   |   |                              D20  |
   |   +------------------------------------------------------------(T21 )+
   |                                    |
   |                                    |
   |                                    |
   |                                    |
   |M4  M230                            M107 |
 532 +-I I---I I--------------------------------------------------------( )--+
   |XISI QF>0                            QCXG |
   |                                    |
   |                                    |
   |                                    |
   |T21                                   |
 535 +-I I-+------------------------------------------------------[SET M5  ]+
   |   |                              WAIT |
   |   |                              STOP |
   |   |                                 |
   |   |                                 |
   |   |                                 |
   |   +------------------------------------------------------[RST M4  ]+
   |                                 XISI |
   |                                    |
   |                                    |
   |                                    |
   |M5  M240                            M115 |
 538 +-I I---I I--------------------------------------------------------( )--+
   |WAIT RF>0                            RG  |
   |STOP                                  |
   |                                    |
   |                                    |
   |X17  M0                             K6000 |
 541 +-I/I---I I--------------------------------------------------------(T22 )+
   |LSDW AUTO                               |
   |   RUN                                |
   |                                    |
   |                                    |
   |X17  M0  M5                          K6000 |
 546 +-I/I---I I---I I--------------------------------------------------(T23 )+
   |

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