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Table 11-4
Diagnostic Interrupt, continued
Byte.
Bit
0.2, 0.3 External channel errors
8.0
Cable break, incremental encoder
(8090)
(8090)
Cause
Measurement system cable not plugged in or sheared off.
or
Encoder without internode signals.
10.0
Incorrect pin connection.
(80B0)
Cable too long.
or
or
Effect
12.0
(80D0)
Elimina-
Check encoder and measurement system cable.
tion
Observe limit values.
Using the MD20, monitoring can be temporarily skipped, at the responsi-
bility of the owner/operator.
8.1
Absolute encoder error
(8091)
(8091)
Cause
Telegram traffic between FM 453 and the absolute encoder (SSI) is faulty or
or
is disrupted:
10.1
Measurement system cable not plugged in or sheared off.
(80B1)
Unauthorized type of encoder (only allowable per MD10).
or
Encoder incorrectly set (programmable encoder).
Telegram length (MD13, MD14) incorrectly specified.
12.1
(80D1)
Encoder delivers erroneous values.
Noise interference on measurement system cable.
Baud rate set too high (MD15).
Effect
Elimina-
Check encoder and measurement system cable.
tion
Check telegram traffic between encoder and FM 453.
Using the MD20, monitoring can be temporarily skipped, at the responsi-
bility of the owner/operator.
8.2
Erroneous pulses, incremental encoder or zero reference mark missing
(8092)
(8092)
Cause
Encoder monitoring circuit has discovered erroneous pulses.
or
In "reference point operation" operating mode, no zero reference mark came
10.2
within one encoder revolution after the reference point switch was passed.
(80B2)
Number of pulses per encoder revolution (MD13) incorrectly input.
or
Encoder faulty: does not deliver the specified number of pulses.
Zero reference mark faulty or missing altogether.
12.2
Pulse length of zero reference mark less than 1.25 µs.
(80D1)
Interference on the measurement system cable.
Effect
Elimina-
Enter MD13 correctly.
tion
Check encoder and measurement system cable.
Observe limit values.
Observe rules on shielding and grounding.
Using the MD20, monitoring can be temporarily skipped, at the responsi-
bility of the owner/operator.
Note: (xxxx) value = Hexadecimal notation in diagnostic buffer.
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
Error Message,
Error Analysis and Elimination
Error response: "Everything OFF", as in Table 11-2
Troubleshooting
Message/
Display
INTF
EXTF
EXTF
STAT
11-11
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