Ismail Simsek
Elektronik-II
03652006

PROGRAMMABLE LOGIC CONTROLLER

PLC analysis at the input data’s and, it controls output sensors with PLC’s program. PLC has got input and output sensors. Photocell, switch and button are input sensors. Lamp, valve, piston and electrical motor are output sensors. Relay systems have got excessive relays and they be formed at relay blocks. The people prefer of PLC in the factories. Because; PLC is more useful than relay systems.

PLC’s repair easier than relay systems. Relay system’s repair doesn’t easy. Because; relay systems have got very excessive cable and relay. But, the failures easy to analyze at the PLC. We usually repair of PLC’s failure, when we change breakdown block or breakdown card.

PLC has smaller dimension than relay systems. Because; there are very excessive cable and relay in the relay systems. That is why, relay systems have big dimension. But, PLC has small dimension. That is why, PLC’s assembly very easy. PLC has higher speed than relay systems. Because PLC is a microcontroller.
PLC is more reliable and decisive than relay systems. Because; there is not mechanic piece in the PLC. That is why PLC usually doesn’t make flawless and it usually deceives.
That is why PLC is more prefer than relay system and PLC is more useful than relay system.

SOURCES
1: PLC and automation systems.(Tahsin Yazir)
2: Electropneumatic and automation systems.(Faruk Kartal)
3: www.sunset.com.
4: Automatic command.(JICA)