Chapter 1 Program a Function Block Diagram
Rockwell Automation Publication 1756-PM009J-EN-P - March 2022 19
A program request to go to Program control.
A program request to go to Operator control.
An operator request to go to Program control.
An operator request to go to Operator control.
To determine whether an instruction is in Program or Operator control,
examine the ProgOper output. If ProgOper bit is set, the instruction is in
Program control. If ProgOper bit is cleared, the instruction is in
Operator control.
Operator control takes precedence over Program control if both input request
bits are set. For example, if ProgProgReq and ProgOperReq bits are set, the
instruction goes to Operator control.
The Program request inputs take precedence over the Operator request
inputs. This provides the capability to use the ProgProgReq and ProgOperReq
inputs to lock an instruction in a desired control.
For example, assume that a Totalizer instruction is always used in Operator
control, and the user program never controls the running or stopping of the
Totalizer. In this case, wire a literal value of 1 into the ProgOperReq input.
This prevents the operator from ever putting the Totalizer into Program
control by setting the OperProgReq input from an operator interface device.
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