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1- PLCs are programmable.
2- Many control relays can be replaced by software, which means less hardware failure.
3- It is easier to make changes in software than in hardware.
4- Special functions such as time delay actions, counters are easy to produce in software.
5- Reliability is more.
6- There is almost no task limit to tasks for which PLCs can be used.
7- It is cost effective control system
Its flexible. We can change the working of the system with minimum effort. And it gives many features like easy monitoring using SCADA or HMI, interface with other systems, alarms, reporting and trend generation and much more
the coast for replacing the old part which don't connect to plc
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