Configuration - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

7
FBD/LD
RnPCPU RnPCPU
RnCPU RnENCPU
(Process) (Redundant)
FBD/LD (function block diagram/ladder diagram) is a graphic language which describes programs by connecting blocks that
perform predefined processing, variable elements, and constant elements along the flow of data and signals.
• This chapter describes the operation and specifications of the FBD/LD. For the operation method of the
engineering tool for creating an FBD/LD program, refer to the following.
 GX Works3 Operating Manual
• A program can be easily created thorough placing and connecting FB elements of process control function
blocks which can be used with the Process CPU. A wide variety of provided function blocks for the process
control simplifies the programming. When process control function blocks are used with the Process CPU,
refer to the following.
 MELSEC iQ-R Programming Manual (Process Control Function Blocks)
7.1

Configuration

The following are the programs written in FBD/LD.
(1)
(2)
(3)
(5)
In FBD/LD programs, data flows from the output point of a function block, function, variable (label or device), or constant to the
input point of another function block or variable.
RnSFCPU RnSFCPU
(Standard) (Safety)
(6)
(1) Worksheet
(2) LD element
(3) FBD element
(4) Common element
(5) Connection point
(6) Connection line
(4)
7
7 FBD/LD
75
7.1 Configuration