Safety
A safety network is used to replace hardwired safety devices to reduce downtime by limiting the shutdown to only the systems affected by the emergency. The safety network must be highly deterministic and repeatable, must be dual channel so that the messages can be crosschecked, and the protocol must transmit each message twice. In addition, the necessary Safety Integrity Level (SIL), the average probability of failure on demand, must be determined so that the appropriate network can be selected. Because the safety system is a network as opposed to traditional hardwired safety, provisions must be made by the control system to place the equipment in a pre-determined safe state should a communications error occur.
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