Possible Response To The Diagnostic Interrupt; Interrupt Response In Different Cm Operating States - Siemens AS-i Master CM 1243-2 a Manual

8.3.1

Possible response to the diagnostic interrupt

Possible response to the diagnostic interrupt
Diagnostic events of the AS-i master and all AS-i slaves are signaled by means of OB 82
(e.g. no voltage on AS-Interface, I/O error).
Note
Diagnostic buffer
Please note that OB 82 is only called for the first error event. If an error from an AS-i slave is
already active, subsequent AS-i slave errors will only be indicated in the diagnostics buffer of
the CPU.
Diagnostic data records can be read out during program execution of the OB 82 block to
determine the cause of the interrupt.
See Section Diagnostic data records (Page 104) for an overview of these possibilities.
8.3.2

Interrupt response in different CM operating states

Interrupt response in different CM operating states
The AS-i master CM 1243-2 generates diagnostic interrupts that are triggered by external
alarm events, in protected mode only and not in configuration mode.
If the diagnostic interrupt cannot be activated (e.g. : when the S7-1200 is in STOP), the
event will only be indicated in the diagnostics buffer and via the LEDs of the
AS-i master CM 1243-2 and the S7-1200 CPU.
AS-i master CM 1243-2 and AS-i data decoupling unit DCM 1271 for SIMATIC S7-1200
Manual, 04/2013, A5E02655230010A/RS-AA/003
Diagnostics
8.3 Alarms
103