Triggering A Hardware Interrupt - Siemens SIMATIC ET 200SP Manual

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5.2.1

Triggering of a diagnostics interrupt

For an incoming or outgoing event (e.g. wire break on a channel of an I/O module), the

module triggers a diagnostic error interrupt if this is configured accordingly.

The CPU interrupts processing of the user program and processes the diagnostic error

interrupt OB (OB 82). The event that triggered the interrupt is entered in the start information

of the diagnostic error interrupt OB.

5.2.2

Triggering a hardware interrupt

If there is a hardware interrupt, the CPU interrupts user program execution and processes

the hardware interrupt block OB, e.g., OB 40. The result that triggered the interrupt is added

to the start information of the hardware interrupt OB.

Note

Diagnostics "Hardware interrupt lost" (from I/O module)

Do not use hardware interrupts for functional purposes (e.g. the cyclic generation of

hardware interrupts).

If the hardware interrupt load is too high, hardware interrupts can get lost depending on the

number of I/O modules and the communication load.

5.2.3

Triggering of a remove/insert module interrupt

In the event of a remove/insert module interrupt, the CPU interrupts processing of the user

program and processes the remove/insert module OB, e.g. OB 83. The event that triggered

the interrupt is entered in the start information of the remove/insert module OB.

Note

Parameter assignment error after removal/insertion

If you write data records from the user program to the modules of the distributed I/O, make

sure that these modules actually exist and are available. You can do this by evaluating

OB83. After inserting a module, OB83 is not called until the module has started up and its

parameters are assigned. This ensures that data record operations can be executed without

errors.

IM 155-6 PN HF interface module (6ES7155-6AU00-0CN0)

Manual, 03/2015, A5E03915895-AF

Interrupts, error messages, diagnostics and system alarms

5.2 Interrupts

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