Command Invalid for Current State (PCMD/SCMD)

What does 24578 mean?

The command issued via a PCMD instruction to an equipment phase, or via an SCMD instruction to an equipment sequence, is not valid given its current operational state. For example, a START command is invalid if the equipment is already running.

• An inappropriate command was sent to an equipment phase or sequence that is already in, or conflicting with, the target state of the command.

Click steps to track your progress.

1. 1

   Review the current operational state of the equipment phase or sequence before issuing any commands.

2. 2

   Modify the control logic to ensure commands are only sent when the equipment phase or sequence is in a state where the command is valid (e.g., only send START if currently in STOPPED state).

3. 3

   For SCMD instructions, limit execution to a single scan using a P1 Pulse or one-shot, as commands are state-dependent and become invalid once the sequence state changes.