Siemens Simatic ET 200S Operating Instructions Manual page 167

Interrupts in DPV1 mode
The ET 200S supports the following interrupts:
• Diagnostic interrupts
• Process interrupts
• Insert/remove interrupts
Requirements: Interrupts are only supported if you operate the ET 200S with interface
modules IM151-1 STANDARD (6ES7151-1AA04-0AB0 and higher) (in the DPV1 mode) and
IM151-1 HIGH FEATURE (in the DPV1 mode).
In case of an interrupt, interrupt OBs are automatically executed in the CPU of the DP
master (see information on program design in the
programming manual).
Triggering of a diagnostic interrupt
When an incoming or outgoing event (e.g. wire break) is registered , the module triggers a
diagnostic interrupt if "Enable: Diagnostic interrupt" is set.
The CPU interrupts the processing of the user program and processes the OB 82
diagnostics block. The event that caused the interrupt to be triggered is entered in the start
information of OB 82.
Evaluating hardware interrupts with
When a process interrupt occurs, the CPU interrupts the processing of the user program and
processes the OB 40 hardware interrupt block instead.
The module channel that triggered the process interrupt is entered in the start information of
OB 40 in the OB 40_POINT_ADDR variable. The figures below present the assignment to
the bits of the local data double word 8.
Process interrupts for 2DI 24 VDC High Feature and 4DI 24 VDC High Feature electronic
modules:
Figure 8-1
ET 200S
Operating Instructions, 12/2005, A5E00515771-03
8.1 Alarm, error and system messages on PROFIBUS DP
STEP 7
Start information of the OB 40: which event has triggered process interrupt for digital
input modules
Alarm, error and system messages
System Software for S7-300/S7-400
8-19