因为PLC在执行此操作时会发生不同步的现象,所以会在执行SVC_REQ#43命令时产生一个错误日志。如果存在重要数据传输,不受这个功能块的影响。可能在使能逻辑中用到SVC_REQ#43功能。–个带有非传输变量的节点应该包含在此使能逻辑中。这会使该功能块直接被控制,不会被激活单元传递的数据所控制。如果在一个程序的扫描周期内里多次使用这个功能块,最后一次的调用会起作用。
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