Siemens Simatic ET200pro

Basics of program execution
5.1 Events and OBs
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 09/2016, A5E35873416-AA
47
Triggers
The table below provides an overview of the triggers, including the possible values for OB
priority, possible OB numbers, default system reaction and number of OBs.
Table 5- 1 Triggers
Types of event sources
Possible priorities (default
priority)
Possible OB num-
bers
Default system
reaction
1)
Number of OBs
Startup
2)
1
100, ≥ 123
Ignore
0 to 100
Cyclic program
2)
1 1, ≥ 123 Ignore 0 to 100
Time-of-day interrupt
2)
2 to 24 (2)
10 to 17, ≥ 123
Not applicable
0 to 20
Time-delay interrupt
2)
2 to 24 (3) 20 to 23, ≥ 123 Not applicable 0 to 20
Cyclic interrupt
2)
2 to 24 (8 to 17, frequency
dependent)
30 to 38, ≥ 123 Not applicable 0 to 20
Hardware interrupt
2)
2 to 26 (18)
40 to 47, ≥ 123
Ignore
0 to 50
3)
Status interrupt
2 to 24 (4)
55
Ignore
0 or 1
Update interrupt
2 to 24 (4)
56
Ignore
0 or 1
Manufacturer-specific or
profile-specific interrupt
2 to 24 (4) 57 Ignore 0 or 1
Isochronous mode interrupt
16 to 26 (21)
61 to 64, ≥ 123
Ignore
0 to 2
Time error
4)
22 80
Ignore
0 or 1
Maximum cycle time exceed-
ed once
STOP
Diagnostics interrupt
2 to 26 (5)
82
Ignore
0 or 1
Removal/insertion of mod-
ules
2 to 26 (6) 83 Ignore 0 or 1
Rack error
2 to 26 (6)
86
Ignore
0 or 1
MC servo
5)
17 to 26 (25)
91
Not applicable
0 or 1
MC pre-servo
5)
17 to 26 (25)
67
Not applicable
0 or 1
MC post-servo
5)
17 to 26 (25)
95
Not applicable
0 or 1
MC interpolator
5)
16 to 26 (24) 92 Not applicable 0 or 1
Programming error (only for
global error handling)
2 to 26 (7) 121 STOP 0 or 1
I/O access error (only for
global error handling)
2 to 26 (7) 122 Ignore 0 or 1
1)
If you have not configured the OB.
2)
For these event sources, apart from the permanently assigned OB numbers (see column: possible OB numbers), you
can also assign OB numbers in STEP 7 from the range ≥ 123.
3)
You can assign a maximum of one hardware interrupt OB to each I/O module in STEP 7.
The start information is displayed in the hardware interrupt OB in the TIA Portal the same as in S7-300/S7-400. You can
find additional information on the start information in the STEP 7 online help.
4)
If the maximum cycle time has been exceeded twice within a cycle, the CPU always switches to STOP regardless of
whether you have configured OB 80.
5)
You can find additional information about these event sources and the runtime behavior in the S7-1500 Motion Control
function manual.