Guidelines for SATT instructions
Keep these guidelines in mind when using the Attach to
Equipment Sequence
(SATT) instruction.Guideline | Details |
Remember that the Logix Designer application overrides ownership of the Equipment Sequence . | Ownership makes sure that a program can command the Equipment Sequence , and it locks out any other sequencers. |
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 . |
When the sequence is done, relinquish ownership. | To relinquish ownership, use a Detach from Equipment Sequence (SDET) instruction. |
Avoid making unnecessary command requests if the equipment sequence is generating sequence events. | Unnecessary command requests can flood the event processing buffers and cause you to miss significant events. |
Use the Result code to verify ownership, and include steps that should take place if the attachment fails because the Equipment Sequence is owned by another program or by the operator. | Use the Result operand to get a code that shows the success or failure of the SATT instruction.
On each execution, the SATT instruction tries to take ownership of the Equipment Sequence . When a program or operator owns an Equipment Sequence , another execution of the SATT instruction fails and produces result code 24582. When you use the SATT instruction, either:
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