Program a Function Block Diagram
Rockwell Automation Publication 1756-PM009G-EN-P - February 2018 19
• Multiple ICONs can reference the same OCON. This lets you disperse
data to several points in your routine.
These instructions support the concept of Program/Operator control.
• Enhanced Select (ESEL)
• Totalizer (TOT)
• Enhanced PID (PIDE)
• Ramp/Soak (RMPS)
• Discrete 2-State Device (D2SD)
• Discrete 3-State Device (D3SD)
Program/Operator control lets you control these instructions simultaneously
from the user program and from an operator interface device. When in
Program control, the instruction is controlled by the Program inputs to the
instruction. When in Operator control, the instruction is controlled by the
Operator inputs to the instruction.
Program or Operator control is determined by using these inputs:
Input Description
.ProgProgReq A program request to go to Program control.
.ProgOperReq A program request to go to Operator control.
.OperProgReq An operator request to go to Program control.
.OperOperReq 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.
program/operator
control
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