The Smoke Control Sequencing for UL-864-UUKL module processes the emergency command and determines the current emergency mode. This module accepts the emergency command, four safety switch inputs, and a shutdown delay duration. The module has state and priority outputs. The priority output provides UL 864 UUKL smoke control support where you can write to the hardware points at a high priority during an emergency.
For information on how the FSM determines the state, see FSM (Emergency Mode).