Field Description Restrictions
Constant Select the check box in the Constant column to set the initial
value of the variable when it is downloaded, but prevent it
from being changed afterward.
Select the check box or clear the selection (default).
---
Comment Set any comments for the variable. The maximum size is 127
bytes.
Note The items that can be set and viewed depend on the type of the local variable. Refer to 6-2-4
Attrib-
utes of V
ariables on page 6 - 13 for details.
2 Select the tab for internal variables, in-out variables (function blocks only), or external varia-
bles, and then register and edit the local variables.
You can also register them directly in the FBD editor
.
Additional Information
The operating procedures for local variables are the same as the procedures used for global
variables.
Refer to 6-5-3 Registering Variables on page 6 - 36.
6-5-4
FBD Programming
With the Safety CPU Unit, you use the FBD language to express algorithms that are inside the POUs
(programs and function blocks). Y
ou add and connect functions and function blocks in the FBD editor
to build algorithms inside POUs (programs and function blocks).
This section describes how to use the FBD editor
.
Opening and Using the FBD Editor
l
Programs
1 Double-click a program under Programming - POUs - Programs in the Multiview Explorer. Or,
right-click the program and select Edit from the menu.
The FBD editor for the program is displayed.
Refer to 6-5-2 Registering POUs on page 6 - 27 for the program registration procedure.
6 Programming
6 - 41
NX-series Safety Control Unit User's Manual (Z930)
6-5 Programming Operations
6
6-5-4 FBD Programming
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