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7 Programming
NX-series Safety Control Unit User’s Manual (Z930)
7-4 Programming Languages
7
7-4-2 FBD Language
The networks shown above include a Jump instruction that changes the top-to-bottom flow of execution
between networks, a label that shows the network to jump to, and a Return instruction.
Refer to Execution Order of Safety Programs Written in the FBD Language on page 7-24 and Execu-
tion Control on page 7-24 later in this manual, and also to the NX-series Safety Control Unit Instructions
Reference Manual (Cat. No. Z931).
• Unlike the ladder diagram language, the FBD language does not have bus bars. The con-
necting lines do not indicate power flow. They indicate the flow of data. The FBD language
does not have an END instruction. Execution for the task period ends when the last network
is executed.
• In this manual, “FBD network” is sometimes used to differentiate programming networks from
physical networks, such as EtherCAT networks.
Networks
Jump label
Jump instruction
Input
parameters
Instructions or user-defined function blocks
Output parameters
Return
instruction
Exception
RETURN
Exception:
1
2
3
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