Hi everyone.
I’m new to plc and am in the process of designing a plc test/learner so that I can self study at home.
I have purchased an S7 1200 with a separate 24v- psu and a tp400 hmi.
My first question.
Is it normal practice to fit MCB’s for each mains powered consumer and in the case of the PSU do I also need to fit DC MCB’s on the outputs to protect its consumers.
Second question.
Do I need to fit AC surpression to all AC control / latching relays, and DC surpression to each 24v- relay?
Thanks in advance
I’m new to plc and am in the process of designing a plc test/learner so that I can self study at home.
I have purchased an S7 1200 with a separate 24v- psu and a tp400 hmi.
My first question.
Is it normal practice to fit MCB’s for each mains powered consumer and in the case of the PSU do I also need to fit DC MCB’s on the outputs to protect its consumers.
Second question.
Do I need to fit AC surpression to all AC control / latching relays, and DC surpression to each 24v- relay?
Thanks in advance