IS220PVIBH1A GE

Analog quantities,such as current,voltage,temperature,pressure,etc.,are continuously changing in size.Industrial production,especially continuous production processes,often requires the control of these physical quantities.

As an industrial control electronic device,if PLC cannot control these quantities,it is a big problem.Therefore,various PLC manufacturers have carried out a lot of development in this area.At present,not only large and medium-sized machines can carry out analog control,but also small machines can carry out such control.PLC carries on the analog quantity control,must be equipped with the analog quantity and the digital quantity mutual conversion A/D,D/A unit.It is also an I/O unit,but a special I/O unit.

模拟量，如电流、电压、温度、压力等等，它的大小是连续变化的。工业生产，特别是连续型生产过程，常要对这些物理量进行控制。

作为一种工业控制电子装置，PLC若不能对这些量进行控制，那是一大不足，为此各PLC厂家都在这方面进行大量的开发。目前，不仅大型、中型机可以进行模拟量控制，就是小型机，也能进行这样的控制。PLC进行模拟量控制，要配置有模拟量与数字量相互转换的A／D、D／A单元。它也是I／O单元，不过是特殊的I／O单元。