Plc Input Module Block Diagram. In all plc systems the plc rack or chassis forms the most important module and acts as a backbone to the system. 32 point input module.
In the following block diagram input and output modules are connected through the brain of plc i e. Output block diagram of plc how to connect input to plc there are several types of input like push button limit switch pressure switch and sensor. We connect input to plc in two types pnp and npn.
Cpu central processing unit programming device.
Cpu central processing unit programming device. Discrete input modules discrete input module block diagram powered from the field powered from plc optical isolator provides electrical isolation between field wiring and the plc internal circuitry light emitting diode photoelectric transistor sithcl dswitch closed c tfl th hledcurrent flow through led g t lihtgenerates light lihtti tfl thlight triggers current flow thru pht l tiphotoelectric. Here we connect one push button to plc. Nowadays plc becomes more and more popular in industries for automation purpose.
