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Diagnostics and error behavior
Diagnostics functions overview
7
Diagnostics and error behavior
7.1 Diagnostics functions overview
Overview
Diagnosis via the CP-
LEDs
Diagnosis via STATUS of
FBs
Diagnosis via diagnostic
buffer of the CP
Diagnostics via diagnostic
interrupt
92
The diagnostics functions enable you to quickly localize any errors, which occur.
The following diagnostics options are available:
n
Diagnostics via the CP-LEDs
n
Diagnostics via FB-STATUS (function blocks)
n
Diagnostics via diagnostic buffer of the CP
n
Diagnostics via diagnostics interrupt
The CP-LEDs give you an initial overview of any internal or external errors as well as
interface-specific errors. More information about the LEDs and their function may be
found at "Hardware description" and at "Firmware update".
n
The FB 7 - P_RCV_RK and FB 8 - P_SND_RK function blocks have a STATUS
parameter for error diagnostics.
–
Reading the STATUS output gives you information on errors, which have occurred
during communication.
–
The STATUS output may be evaluated by the user program.
–
The diagnostics events on STATUS are also entered in the diagnostics buffer of
the CP.
Every CP error is entered in the diagnostic buffer of the CP. In the same way as with the
diagnostic buffer of the CPU, you can also use the PLC functions to display the informa-
tion of the CP diagnostic buffer.
An error message is only output if the ERROR bit (request completed
with error) is set. In all other cases the STATUS word is zero.
n
The CP can trigger a diagnostic interrupt on the CPU assigned to it. The CP provides
4bytes of diagnostic information for the CPU.
–
These data may be accessed by reading the diagnostics buffer of the CP respec-
tively by reacting with OB 82 on the diagnostics.
n
The diagnostics were also entered in the diagnostics buffer of the CP.
n
When a diagnostic interrupt event occurs, the red SF LED lights up.
VIPA System 300S
HB130 | CP | 341-1CH01 | en | 18-40
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