Chapter 8 Logic Instructions
8-17
FB/FC
FB
SEMA is used for giving priority to CLAIM. (The output will be valid in the
second period.)
Parameters
Meaning
Description Valid range
CLAIM
Input
Set signal TRUE or FALSE
RELEASE
Reset signal TRUE or FALSE
Q
signal
Output Output signal TRUE or FALSE
Boolean
Bit string Integer
Real
number
Time, date
String
UINT
SINT
INT
DINT
REAL
STRING
CLAIM
●
RELEASE
●
Q
●
Note:
The symbol ● indicates that the parameter is allowed to connect to the variable or constant of the data
type.
Function Explanation
When CLAIM of SEMA is TRUE, Q is TRUE. When RELEASE is TRUE, Q is FALSE. When CLAIM and
RELEASE are both TRUE, Q is TRUE.
Precautions for Correct Use
When CLAIM is TRUE, Q will be TRUE in the second period.
SEMA
EN ENO
CLAIM
Q
SEMA_instance
RELEASE