Interfacing dc motor with s7-200

[JRB]

Im sorry for incomplete circuit, I have also supplied 5V to the collector and across one side of the relay coil.

This doesn't make sense.

[In your drawing], you would only want to supply +5VDC to the top relay terminal, or non arrow side of each diode.

If you supply +5VDC to the transistor collector as well, the CE junction is short circuited across the 5VDC supply,
whenever the PLC output contacts close.

 

[Lancie1]

[In your drawing], you would only want to supply +5VDC to the top relay terminal, or non arrow side of each diode.

Yes indeed. That is right out of the textbook for creating a switching transistor circuit:

Basic NPN Transistor Switching Circuit