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We know that the PLC is designed to perform a specific job!Can we be programmed again to perform other work or to develop their work
Of course we can, PLC is Programmable Logical Controller, it means we can do programming or reprogramming the controller. If you want to make a PLC work other works, according to your works or projects make something change on your PLC.
yes u can reprograme the plc using the software . And we no need to change the external connection we have to change only the programe thats is its main benefit , only one time wiring.
Just reprogram your PLC but make sense about the I/Os of the systems
we can make changes in plc programming at any time as per the requirement of the machine for which plc is working we can add an additional i/o card or analog card
but after making changes u can download either hardware/software only or full download by stoping the plc in TIA s7 SIEMENS PLC's