Banner SCR P Series Instruction Manual page 47

Programmable Safety Controller SCR P
Typically, safety stop circuits are a series connection of at least two N.O. contacts coming from two separate, positive-
guided relays, each controlled by one separate safety output of the Safety Controller. The safety function relies on the use
of redundant contacts to control a single hazard, so that if one contact fails On, the second contact stops the hazard and
prevents the next cycle from occurring.
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