Chapter 1 Process Control Function Block; Process Control Function Block Types - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

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PROCESS CONTROL FUNCTION BLOCK
A process control function block is a function block whose function is extended for process control. It contains structure data
including process conditions and process status (tag data).
A process control function block can be used with the Process CPU and SIL2 Process CPU (standard program only) for
MELSEC iQ-R series.
Ex.
Program using the tag FB (M+M_2PIDH_) which optimizes responsive performance for a setting value and control
performance to a disturbance
(1) Tag FB of multi-point program setter (M+M_PGS2_)
(2) Tag FB of two-degree-of-freedom advanced PID control (M+M_2PIDH_)
(3) General process FB of 8 points time proportional output (M+P_DUTY_8PT_)
1.1

Process Control Function Block Types

The process control function block has following types.
Item
General process FB
Tag access FB
Tag FB
User-defined tag FB
1 PROCESS CONTROL FUNCTION BLOCK
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1.1 Process Control Function Block Types
(1)
Description
Performs process control operation, such as correction operation and control operation.
Performs processing by accessing tag data of a user-defined tag FB.
It can be used only in the user-defined tag FB.
Performs process control operation as a controller or an indicator. It performs processing by accessing tag data defined as
global labels.
The execution status can be checked and controlled on the faceplate of the engineering tool.
Combines tag access FBs, standard functions, or standard function blocks to extend process control processing of a tag
FB.
It performs processing by accessing tag data in the same way as a tag FB. The execution status can be checked and
controlled on the faceplate of the engineering tool.
(2) (3)