Siemens Simatic S7 Series

References
E.2 Interrupt events in priority order
S7-200 SMART
694 System Manual, 09/2015, A5E03822230-AC
E.2
Interrupt events in priority order
Table E- 2 Priority order for interrupt events
Priority group
Event
Description
Communications
Highest Priority
8
Port 0 Receive character
9 Port 0 Transmit complete
23
Port 0 Receive message complete
24 Port 1 Receive message complete
25
Port 1 Receive character
26
Port 1 Transmit complete
Discrete
Medium Priority
19
PTO0 complete interrupt
20
PTO1 complete interrupt
34
PTO2 complete interrupt
0
I0.0 Rising edge
2
I0.1 Rising edge
4
I0.2 Rising edge
6
I0.3 Rising edge
35
I7.0 Rising edge (signal board)
37
I7.1 Rising edge (signal board)
1
I0.0 Falling edge
3
I0.1 Falling edge
5
I0.2 Falling edge
7
I0.3 Falling edge
36
I7.0 Falling edge (signal board)
38
I7.1 Falling edge (signal board)
12
HSC0 CV=PV (current value = preset value)
27 HSC0 Direction changed
28
HSC0 External reset
13 HSC1 CV=PV (current value = preset value)
16
HSC2 CV=PV (current value = preset value)
17
HSC2 Direction changed
18
HSC2 External reset
32
HSC3 CV=PV (current value = preset value)
Timed
Lowest Priority
10
Timed interrupt 0 SMB34
11
Timed interrupt 1 SMB35
21
Timer T32 CT=PT interrupt
22
Timer T96 CT=PT interrupt