Troubleshooting - Siemens SIMATIC S7-300 Manual

Troubleshooting

11.2.2 Diagnostic interrupts
Overview
Internal errors, external errors and external channel errors are indicated to an
interrupt–capable system by means of diagnostic interrupts (see diagnostic
interrupt data in Tables 11-4, 11-5). This presupposes that the diagnostic in-
terrupt message was activated at the time of configuration (see Chapter 5). If
the system is not interrupt–capable, the diagnostic interrupt information must
be read out cyclically with FC 6.
The diagnostic interrupts are identified by setting the corresponding byte.bit
no. (see diagnostic interrupt data, Section 6.4).
Internal errors
External errors
External channel errors
The operator control errors in the "external channel error" class are specified
again, and are stored in data block 164 or in the diagnostic buffer.
The FM 354 signals a diagnostic interrupt "incoming" or "outgoing."
Message to the CPU (precondition: interrupt message activated
(see Section 5.2)
No OB 82 exists OB 82
CPU CPU
Enters the diag-
switches to
nostic informa-
STOP
tion in the diag-
nostic buffer of
the CPU (4 by-
tes) and calls
SFC 52 SFC 52
Alarm
If processing is to continue after a diagnostic interrupt, then Restart after the
acknowledgement
error has been remedied (see write job no. 11 Sections 6.2.1 and 9.3.3).
Internal errors cannot be acknowledged. External errors are self–acknowledg-
ing.
11-6
Error Class
Byte-.Bit-No. 0.1
Group error byte 2, 3
Byte-.Bit-No. 0.2
Byte-.Bit-No. 0.2, 0.3
Group error byte 8
Diagnostic interrupt
OB 1
Enters the diag- Calls FC 6
nostic informa-
tion in the user
DB starting at
address 72 and
calls FC 4
On operator control error:
(addr. in user DB 80.7)
for further error specification read
DS 164 in OB 1
Coding Message
LED "SF"
LED "SF" and "DIAG"
LED "SF" and "DIAG"
Message in the "trou- Entry in diag-
bleshooting" display nostic buffer
of "Parameterize FM f "P t i FM
354" 354
Menu: Test Error
evaluation
FM 354 Servo Drive Positioning Module