Allen-Bradley LOGIX 5000 Reference Manual page 452

Chapter 7 Equipment Phase Instructions
452
Structured Text
POVR (PhaseName, Command, Result);
Operands
Ladder Diagram
Operand Type
Phase Name phase
Command command
Result DINT
Structured Text
The operands are the same as those for the Ladder Diagram POVR instruction.
Guidelines for using the POVR Instruction
Guideline
If want to override other owners.
Limit execution of a POVR instruction to
a single scan.
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
Format Description
Name of the Equipment phase to change to a
equipment phase different state
Name of the One of these commands for the
command equipment phase:
• Hold
• Stop
• Abort
immediate To let the instruction return a code
for its success or failure, enter a DINT
tag
tag in which to store the result code.
Otherwise, enter 0.
Details
Want the equipment to hold, stop, or abort even if have manual
control of the equipment phase via Logix Designer software?
• Yes - Use the POVR instruction
• No - Use the PCMD instruction
This also applies to HMI, FactoryTalk Batch software or other
programs. Use the POVR only to hold, stop, or abort, regardless of
ownership.
For example, suppose the equipment checks for jammed
material. If there is a jam, always abort the equipment. In that
case, use the POVR instruction. This way, the equipment aborts
even under manual control via Logix Designer software.
Limit the execution of the POVR instruction to a single scan. Each
command applies to only a specific state or states. Once the
equipment phase changes state, the command is no longer valid.
To limit execution, use methods such as:
• Execute the POVR instruction within a P1 Pulse (Rising Edge)
or P0 Pulse (Falling Edge) action.
• Place a one shot instruction before the POVR instruction.
• Execute the POVR instruction and then advance to the next
step.