在系统状态参考表中可以看到–些离散型的参数(%S,%B和%SC),如果梯形图中用到这些参数,也可以在梯形图中看到,可以据此确定各种条件和故障的状态。举例来说,如果上面两个表中的任–个表有故障记录,%SC0009将置位。再比如,如果CPU内存备用电池电量低,则%SA0011置位。系列90-30PLC CPU指令参考手册,GFK-0467.包含–个系统状态参考表”.
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