Guidelines for SCMD instructions
Keep these guidelines in mind when using the
Equipment Sequence
Command (SCMD) instruction. The SCMD instruction can send these commands: START, RESTART, HOLD, STOP, ABORT, and RESET.Guideline | Details |
Limit execution of the SCMD instruction to a single scan. | Limit the execution of the SCMD instruction to a single scan. Each command applies to only a specific state or states. Once the Equipment Sequence changes state, the command is no longer valid. To limit execution, use methods such as:
|
The Equipment Sequence must be owned by the program to command it. | Both Equipment Sequence s and Equipment Phase s must be owned to be commanded. The ownership commands are Attach (SATT)Detach (SDET).Internal sequencers (programs), external sequencers ( FactoryTalk Batch ), and operators use an Attach instruction to command an Equipment Sequence . |
Provide Feedback