Chapter 6 Usage of Various Functions
6-4
6.1.3 External Interrupt Function
PLC option card for iS7 inverter Series can perform 6 points of external contact interrupt by
using input of main unit without special interrupt module.
1) Usage
This function is useful to execute a high speed execution regardless of scan time.
2) External Interrupt processing time
ㆍ
P0 ~ P5 : 10
μ
s
-. Above Interrupt processing time not include the program processing time of
external interrupt itself. It can be delayed by the processing time of interrupt
program.
3) Operation Explanation
4) Function
(1) Max. 6 points can be used to external interrupt input within P000 ~ P005.
(2) The number of external interrupt can be set max. 6. Namely, the number of external interrupt
is decreased by Time-driven Interrupt.
(3) The execution conditions of external interrupt is divided into following 3 kinds.
- Rising edge : Interrupt occurs at rising edge of external Interrupt contact point.
- Falling edge : Interrupt occurs at falling edge of external Interrupt contact point.
- Rising & falling edge : Interrupt occurs at both edges of external Interrupt contact point.
Remark
External input signal
Scan program
External contact
interrupt
program
Scan program
In case of occurrence of
external interrupt signal
pause being executed scan
program and process
interrupt program.
End the interrupt
program process then
resume to execute
scan program.
