Process Control Instructions
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018 117
Description
The RMPS instruction is typically used to provide a temperature profile in a batch
heating process. The output of this instruction is typically the input to the
setpoint of a PID loop.
Whenever the value computed for the output is invalid, NAN, or INF, the
instruction sets Out = the invalid value and sets the math overflow status flag. The
internal parameters are not updated. In each subsequent scan, the output is
computed using the internal parameters from the last scan when the output was
valid.
Monitoring the RMPS Instruction
There is an operator faceplate available for the RMPS instruction.
Affects Math Status Flags
No
Major/Minor Faults
None specific to this instruction. See Common Attributes for operand-related
faults.
Execution
Function Block
Condition/State Action Taken
Prescan EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is false EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is true EnableIn and EnableOut bits are set to true.
The instruction executes.
Instruction first run Clear CurrentSeg to 0.
Mode is set to operator manual mode.
SoakTimeProg and SoakTimeOper are set to SoakTime[0]
if SoakTime[0] is valid.
Instruction first scan All the operator request inputs are cleared to false.
If ProgValueReset is true, all the program request inputs
are cleared to false.
The operator control mode is set to manual mode if the
current mode is hold.
Postscan EnableIn and EnableOut bits are cleared to false.
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