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PLC从传统的继电器回路发展而来，最初的PLC甚至没有模拟量的处理能力，PLC从开始就强调的是逻辑运算能力。随着科技的发展，控制技术的突飞猛进，PLC发展到今天，已经全面移植到计算机系统控制上了，已经具备了强大的模拟量处理能力。对于机组控制，前期由于PLC模拟量处理能力的局限，大部分模拟量参数的控制都采用开关，如压力开关、液位开关等。这些开关大部分是机械式的，或者是通过设定器设定报警点，从而转换成数字量。这样往往控制精度相对较低，难免有误动作。随着PLC模拟量处理能力的强大，模拟量处理模块的产生，可以把测量变送器的信号直接引入PLC处理模块，在程序中写入联锁动作点。大大的提高的控制精度，减少了误动作。
PLC内部资源极其丰富，内部存储器（软继电器）数量往往数以千数。PLC采用“软器件”、“软触点”进行联锁，它并不改变PLC外部电路的结构，因而不存使电路复杂化的问题。而这种联锁本质上是增加PLC运算的条件，使得PLC在进行输出之前需要进行更多的安全可靠性判断，从而使系统的安全可靠性得到提高。通过系统保护程序的开发与运行，使PLC能及时感知系统的故障或存在的事故隐患，并通过保护程序做出相应的反应，以防止事故发生或扩大，更好的保护人身和设备的安全。
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