30.15.1 Logic Program Settings Guide

Logic Program

Select whether or not to use the logic features.

For the list of models that support the logic features, please see the following:

You can create a logic program in the models that do not support logic features, but the logic program will not operate even if the project file is forwarded to the display unit.
Even if you change from [Enable] to [Disable], the logic program will not be deleted. You can also edit the logic program.

Select [Variable Format] or [Address Format] to register an address.

You cannot select [Address Format] when there is a Function Block in the [Screen List] window.

Share Local Variables in Function Blocks

Selects whether identical function block instructions in the logic program will share local variables or have individual ones.

Enable

Identical function block instructions share local variables.

Disable

Each FB has its own local variable even for identical function block instructions.

For the differences resulting from the settings for Share Local Variables in Function Blocks settings, please see the following.
30.8.2 Function Block Variables

Retentive Area Settings

Click [Retentive Area Settings] to display the [Retentive Area Settings] dialog box.

The retentive/volatile points can be specified for symbol variables in [Variable Format]. The retentive/volatile ranges can be specified for symbol variables in [Address Format].

Variable Format

You can specify only the variable points for retentive/volatile.

You can configure the retentive/volatile settings individually in the [Symbol Variable] window, the [Address] window or [Properties] after creating a new variable.

Please note that this setting is volatile when creating a new variable.

Address Format

For each address, specify the retentive/volatile range. With this setting, all the addresses within the retentive area will be retained, and the address values within the clear area will not be retained.

Please note that all the variables allocated to I/O (X, Y, I, Q) will be set to volatile. You cannot change the settings to retain variables between sessions. Furthermore, you can only choose the retentive setting for PID Variables (U).

Initialization Settings of Number of Retentive/Volatile

Symbol Variable	Reset		For Address Format
Symbol Variable	Retentive	Volatile	For Address Format
Bit Variable	4000 points	4000 points	M_
Integer Variable	4000 points	4000 points	D_
Float Variable	64 points	64 points	F_
Real Variable	64 points	64 points	R_
Timer Variable	256 points	256 points	T_
Counter Variable	256 points	256 points	C_
Time Variable	32 points	32 points	J_
Date Variable	32 points	32 points	N_
PID Variable	8 points	0 points	U_