Basic componant of PLC Programs .
1. CPU ( Central Processor Module )
Process software application in ROM/RAM. Some application depend on Brand or Type.
2. Memory Unit
- ROM : Storage functions of the PLC Programs, Have battery to back up.
- RAM : Can be divided into EPROM, which will require special equipment to write and delete
3. I/O Unit
- Digital input module : Receive digital signal from Input device. ( 24VDC/VAC, 110V, 220V )
- Digital output module : Send digital signal to Output device. ( 24VDC/VAC, 110V, 220V )
- Analog input modle : Receive analog signal from Input device. ( 0-10VDC, 4-20Ma )
- Analog output module : Send analog signal to Output device. ( 0-10VDC, 4-20Ma )
4. Power supply
To supply electricity to PLC Program device.
5. Base module
To connect all PLC Programs device.
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