RS232接口——
热继电器过载信号的处理
不管输出单元的LED灯亮还是灭，如果负载不能进行ON或OFF时，主要是由于过载、负载短路或容量性负载的冲击电流等，引起继电器输出接点粘合，或接点接触面不好导致接触不良。
很多低端PLC通过步进或直接输出来支持运动控制。利用价格更高的专用模块，则可以实现某些更高级的运动控制，但是必须将这些模块增加到基本系统中去。即使这样，大多数设备仍然使用梯形图逻辑进行编程，这需要对编程环境具有较深入的了解，而编程环境则随着生产厂家的不同而有所不同，更高级的功能通常由专用的功能块来实现。
这些故障，都可以用合适的故障诊断方法进行分析和用软件进行实时监测，对故障进行预报和处理。
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