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11-4
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
When a diagnostic interrupt occurs, the FM provides a defined system state
due to the following actions:
The positioning is aborted.
The synchronization is deleted if:
– The external auxiliary voltage is missing,
– A zero-mark error has been detected, line fault (5 V encoder signals),
– The traverse range and the working range have been left (an operating
error is also signaled).
The start of a new traverse is only possible when the error has been recti-
fied. With an operating error jogging in the direction of the working range
is still possible.
If the FM 351 signals an “incoming” error, you should note the following
sequence:
1. The FM 351 detects one or more errors and initiates a diagnostic inter-
rupt. The LED “SF” and, depending on the error, the LEDs “CH1”/“CH2”
light.
2. The CPU operating system calls OB 82.
3. You can evaluate the four-byte start information of OB 82.
4. If this information is not enough, then you must read the module-specific
diagnostic data.
The FC DIAG_INF reads the diagnostic data and enters it in the channel
DB in the parameter DIAGNOSTIC_INT_INFO. The first four bytes are
identical to the start information of the OB 82. The rest of the bytes con-
tain the additional information.
5. From a program point of view, the evaluation is finished.
If you require still further information, that is, about the operating errors,
then you must call the “FM Config” operating interface and read the error
messages in the service mask.
If the FM 351 signals an “outgoing” error, then you should take note of the
following sequence:
1. The FM 351 detects that all errors have been rectified and initiates a diag-
nostic interrupt. The LED “SF” does not light any more.
2. The CPU operating system calls the OB 82.
3. First you should evaluate Bit 0 in the first byte (OB82_MDL_DEFECT).
If this bit is “0”, then no errors are present on the module. Your evalua-
tion can terminate here.
FM 351 Response
to an Error with
Diagnostic
Interrupt
FM 351 Detects an
Error (”Incoming”)
FM 351 Detects the
Transition to the
Error-Free Status
(”Outgoing”)
Error Handling
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