Siemens SIMATIC S7-200 System Manual page 168

S7-200 Programmable Controller System Manual
Operation of the Attach Interrupt and Detach Interrupt Instructions
Before an interrupt routine can be invoked, an association must be established between the
interrupt event and the program segment that you want to execute when the event occurs. Use
the Attach Interrupt instruction to associate an interrupt event (specified by the interrupt event
number) and the program segment (specified by an interrupt routine number). You can attach
multiple interrupt events to one interrupt routine, but one event cannot be concurrently attached to
multiple interrupt routines.
When you attach an interrupt event to an interrupt routine, that interrupt is automatically enabled. If
you disable all interrupts using the global disable interrupt instruction, each occurrence of the
interrupt event is queued until interrupts are re-enabled, using the global enable interrupt
instruction, or the interrupt queue overflows.
You can disable individual interrupt events by breaking the association between the interrupt
event and the interrupt routine with the Detach Interrupt instruction. The Detach Interrupt
instruction returns the interrupt to an inactive or ignored state. Table 6-46 lists the different types of
interrupt events.
Table 6-46 Interrupt Events
Event Description
0 I0.0
1 I0.0
2 I0.1
3 I0.1
4 I0.2
5 I0.2
6 I0.3
7 I0.3
8 Port 0
9 Port 0
10 Timed interrupt 0
11 Timed interrupt 1
12 HSC0
13 HSC1
14 HSC1
15 HSC1
16 HSC2
17 HSC2
18 HSC2
19 PLS0
20 PLS1
21 Timer T32
154
Rising edge
Falling edge
Rising edge
Falling edge
Rising edge
Falling edge
Rising edge
Falling edge
Receive character
Transmit complete
SMB34
SMB35
CV=PV
(current value = preset value)
CV=PV
(current value = preset value)
Direction changed
External reset
CV=PV
(current value = preset value)
Direction changed
External reset
PTO pulse count complete interrupt
PTO pulse count complete interrupt
CT=PT interrupt
CPU 221 CPU 224XP
CPU 224
CPU 222 CPU 226
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Y Y
Y
Y
Y
Y
Y
Y
Y Y
Y Y
Y Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y