如果 RUN LED指示灯为 OFF 但是 OK指 示灯为 ON, 表示 CPU 在停止无 I/O 扫描模式。. 如果 RUN 指示灯绿色闪烁且 Fault LED 指示灯为 ON,表示模式开 关从 STOP 到 RUN 方式时有致命错误。切换工作模式开关仍然 可以将 PLC 置于运行模式。 FAULT CPU 在 Stop/Faulted 模式下为 ON,因为有致命错误。清除 I/O 故 障表和 PLC 故障表后 Fault LED 为 OFF。如果该 LED 闪烁 并且 OK 灯为 OFF，表示 PLC 上电自检时检测到致命错误。和 PLC 现场服务人员联系。

ALLEN BRADLEY 2750-TR6E SERIES A HIGH TEMP PROGRAMMABLE

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