Triggering Of A Diagnostics Interrupt; Triggering A Hardware Interrupt - Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF Manual

System diagnostics
In STEP 7 (TIA Portal), the innovated system diagnostics is available for the devices of the
S7-1500 automation system (IO controller S7-1500 CPU) and ET 200SP (IO device).
Independent of the cyclic user program, alarms are made available on the display of the S7-
1500 CPU, the CPU web server and the HMI device.
You will find more information on system diagnostics in the Diagnostics
(https://support.industry.siemens.com/cs/ww/en/view/59192926) function manual.
5.2.1

Triggering of a diagnostics interrupt

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

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.
Interface module IM 155-6 PN/2 HF (6ES7155-6AU01-0CN0)
Manual, 10/2018, A5E03915895-AH
Interrupts, error messages, diagnostics and system alarms
5.2 Interrupts
39