Common plc IO module as follows

Common plc IO module as follows:
Switch: Press voltage level points with 220VAC, 110VAC, 24VDC, by isolating way points, with relay isolation and transistor isolation.
Analog: divided by signal type, plc modules  plc analog output modules there is a current type (4-20mA, 0-20mA), voltage type (0-10V, 0-5V, -10-10V), etc., according to the accuracy of points, there are 12bit, 14bit, 16bit, etc. .
In addition to the generic plc IO module, controller plc there are special IO modules, such as thermal resistance, thermocouple, pulse and other modules.
Press the I / O module specifications and determine the number of points, I / O modules can be more or less, but its maximum number of CPU capacity can be managed by the basic configuration, namely by the largest floor or rack slot limit.