Rockwell Automation 1794-Lxxxx PhaseManager User Manual
Page 98
98
Publication LOGIX-UM001B-EN-P - April 2010
Appendix A
Equipment Phase Instructions (PSC, PCMD, POVR, PFL, PCLF, PXRQ, PRNP, PPD, PATT, PDET)
Guidelines for Using the PATT Instruction
Guideline
Details
Consider ownership if you have
multiple sequencers that use a
common equipment phase.
Ownership makes sure that a program can command all the equipment phases it needs and
locks out any other sequencers.
Remember that RSLogix 5000
software overrides the controller.
Regardless of whether a program or FactoryTalk Batch software owns an equipment phase,
you can always use RSLogix 5000 software to override ownership and command the
equipment phase to a different state.
Use the Result operand to validate
ownership.
Use the Result operand to get a code that shows the success/failure of the PATT instruction.
To interpret the result code, see “PATT Result Codes” on
page 99
Avoid or plan for a result code =
24582.
On each execution, the PATT instruction tries to take ownership of the equipment phase. Once
a program owns an equipment phase, another execution of the PATT instruction produces a
result code = 24582. When you use a PATT instruction, either:
• limit its execution to a single scan to avoid the 24582 result code.
• include in your conditions for ownership a result code = 24582. See the example on
page 100
.
When the sequence is done,
relinquish ownership.
To relinquish ownership, use a Detach from Equipment Phase (PDET) instruction. See
If you use
Then
FactoryTalk Batch software to also run
sequences within this controller
Before you execute your sequence
(process), take ownership of all the
equipment phases that the sequence
uses.
multiple programs to command the same
equipment phase
none of the above
There is no need to own the equipment
phases.
This
Overrides this
RSLogix 5000 software
controller (internal sequencer)
FactoryTalk Batch software (external sequencer)
controller (internal sequencer)
none
FactoryTalk Batch software (external
sequencer)
none