Omron NX-SL3300 User Manual page 341

You can use forced refreshing for the following data types.
Boolean
Bit string
Integers
Times of Day
Precautions for Safe Use
• With forced refreshing, the values of variables are overwritten with specified values and then
the safety programs are executed.
If forced refreshing is used for variables that give the results of program processing, the vari-
ables will first take the specified values, but they will then be overwritten by the safety pro-
gram.
• Depending on the difference in the forced status, the control system may operate unexpect-
edly.
Precautions for Correct Use
• Forced status for forced refreshing is not removed when you change from DEBUG mode
(STOPPED) to DEBUG mode (RUN).
• You can use forced refreshing for the following variables: device variables assigned to Safety
I/O Units and user-defined variables.
• Even if you use forced refreshing for the device variables assigned to the input terminal to a
Safety Input Unit, the forced value will not be applied to the variable that is assigned to the
I/O port of an NJ/NX-series CPU Unit.
l Forced Refreshing of BOOL Variables in the FBD Editor
Use the following procedure to execute forced refreshing on BOOL variables.
1
Click the present value of the BOOL variable to change.
Example: To force-refresh variable a, click the present value of FALSE.
The value changes to a temporary status.
A temporary value appears in <> on the right side of the present value. This indicates that the
temporary value is available for forced refreshing.
Each click toggles the temporary value.
NX-series Safety Control Unit User's Manual (Z930)
BOOL and SAFEBOOL
BYTE and WORD
INT, SAFEINT, DINT, and SAFE-
DINT
TIME and SAFETIME
Temporary value is displayed
7 Checking Operation and Actual Operation
7
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