关于“表类型”的参数在首次扫描中设置。触点10-PRES,当置位时,将表示V0故障表中含有-故障输人数据。故障逻辑置-故摩于故障表之后,PLC CPU将在扫描中令常开点置位。如果在两次连续扫描过程中,故障放人故障表中,则常开触点为两个连续扫描置位。本例中使用一个存贮在%R0600的参敷块。在SVCREQ功能模块执行之后,参数块的第四、第五第六个字中包含有发生故障的/0模块的地址。
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