6F3B0253
7. Instructions
Transitional contact (Falling edge)
Expression
Input Output
Function
When the input at last scan is ON and the input at this scan is OFF, the output is turned ON. This instruction is used to detect the input changing from ON to OFF.
Execution condition
Input | Operation | Output |
OFF | When the input state at last scan is OFF | OFF |
| When the input state at last scan is ON | ON |
ON | Regardless of the input state at last scan | OFF |
Operand
No operand is required.
Example
Coil Y022 comes ON for only 1 scan when the device X000 comes OFF.
X000
Y022
1 scan time1 scan time
Note
• In case of T1, the maximum usable number in a program is 512. ( | and | total) |
•In case of T1S, the maximum usable number in a program is 2048.
( P N (P) (N) total)
120
