Machinery Safety 101

Using Form C relays in safety circuits

I recently had a dis­cus­sion with a col­league who wanted to know if it was OK for a design to include a form C relay in an e‑stop cir­cuit. You might recall that e‑stop func­tions are required to meet at least PLc/SIL1 require­ments [1], [2]. It’s import­ant to remem­ber that PLc/SIL1 can be met using Cat­egory 1, 2, or 3 archi­tec­tures.…

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