SIL Stop, Stop Category 1, Wiring Category 3/4 Configuration

Stop Category 1 is defined as “a controlled stop with power available to the machine actuators to achieve the stop and then removal of power when the stop is achieved.”

When the emergency stop is triggered, the stop command is first sent to an external device (for example, a PLC or a drive). This way, the process is stopped in a controlled manner rather than by immediate power removal. After a pre- defined time, the SIL Stop Command is then sent to the SIM to de-energize loads on the SIL avatars in the associated SIL group.

For setup, the recommendation is to use a PLC to help ensure that the process is correctly stopped before the SIL Stop occurs.

The Stop command can be routed directly to a digital input of the PLC, or to a TeSys™ island Digital I/O Module avatar, using one of its digital inputs read by the PLC. Upon receiving a stop command input, the PLC initiates a controlled stop by issuing an operational stop command to the targeted TeSys island avatar.

Stop Command, Wiring Category 3/4

	Avatar A1		Wiring Category 3/4, Stop Category 1
	SIL Group 1		Controlled Stop Category 1 command
	Motor		PLC
	Uncontrolled stop		Operational stop command

Example: Motor Two Directions - SIL Stop, W. Cat 3/4 — Stop Category 1, Wiring Category 3/4 Configuration

Legend for Example: Motor Two Directions - SIL Stop, W. Cat 3/4 — Stop Category 1, Wiring Category 3/4 Configuration

	Parallel link		S2 Start Button
	Reversing link		Input
	Power supply		Start
	Flat cable connector		Extension
	SIL interface Module (SIM)		Controlled stop
	Preventa XPS-UAF Module		Stop Category 1
	Emergency stop push button (S1)