Sepasoft MES Module Suite
Permissive Start in Batch Control
|
Version specific: In MES 3.81.13 RC1 including MES 4.83.2 RC1, and later. |
Permissive Start is a functionality that applies to PLI state handling for Equipment, Synchronize, Transfer In, and Transfer Out phases. Its primary purpose is to allow field equipment (PLC) to prevent a phase from starting until specific conditions are met, such as closing an open door.
|
Permissive Start is intended for operational coordination. It is not a replacement for safety-rated interlocks. |
Key characteristics:
- Control: The "Permissive Start" state can only be set by field equipment. State number is '17'.
- Operational Behavior: When a phase is activated, if the state is currently "Permissive Start," the system waits for the state to transition to "Idle" before issuing the "Start" command. See Permissive Start in Batch Command Life Cycle below.
- Visual Indication: To alert that a phase requires attention, the Batch Monitor and Batch Controller components display steps in the "Permissive Start" state in yellow by default, though this color can be customized.
Permissive Start indicator in Batch Monitor:
Permissive Start indicator in Batch Controller:
- Data Recording: When an equipment phase is activated, the "Permissive Start" state and any "Message" parameters set by the PLC are recorded in the Electronic Batch Record (EBR) and displayed in the Message List
Permissive Start in Batch Command Life Cycle
When an element is activated, the current State determines the specific command issued to the phase. For instance, if the State is Complete, a Reset command is issued. If the State is Permissive Start, the system waits for the state to transition to Idle before sending the Start command.
See the State Transition diagram for the state-command lifecycle.
Sepasoft MES Module Suite