Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

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11 PROCESS CONTROL INSTRUCTIONS
11.1 Overview
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Process control instructions and data configuration
This section describes the data configurations used by process control instructions.
Data configuration in which loop tags are used
The process control instructions use control information common to each loop by storing it in common memory. The group of
this common information is called a loop tag, and the storage memory is called loop tag memory. Loop monitoring and tuning
can be performed by monitoring the loop tag.
Ex.
Block diagram of two-degree-of-freedom PID control (S2PID)
S.IN
S.PHPL S.2PID
S.OUT1
Loop tag memory
Process
control
instruction Process
control
instruction Process
control
instruction
Process
control
instruction
Operation
constant 1 Operation
constant 2 Operation
constant 3 Operation
constant 4 Block
memory 1 Block
memory 2 Block
memory 3 Block
memory 4
Output Output Output Output
Input Input Input