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Diagnostics and troubleshooting
8.4 Error correction
Byte
Bit
STEP 7 online
message
13
1
FM positioning,
error in
absolute value
encoder
FM 352-5 fault/error
description
SSI frame error
The red IOF LED is on.
What the diagnostic fault/error
means
Possible causes of error
The SSI encoder data does not Faulty wiring from the
match the expected format for FM 352-5 encoder interface to
the type encoder that was set. the encoder.
The SSI encoder data is not
being received by the
FM 352-5.
The terminals are not screwed
tight.
The terminal strip is not seated
Note: This diagnostics interrupt correctly.
must be enabled before it can
The wrong encoder
be reported.
parameters have been
selected for the encoder used.
The encoder connecting cables
are too long.
The encoder is faulty.
13
3
FM positioning,
voltage monitor
sensing
Encoder sensor supply
fault (overload)
The red IOF LED is on.
and
The red 24VF LED is
on.
The 24 V DC or 5 V DC
encoder supply is shorted or
overloaded.
Faulty wiring from the
FM 352-5 encoder interface to
the encoder.
Other FM positioning
diagnostics are invalid if this
error occurs.
The encoder is overloading or
shorting the 24 V DC or 5 V
DC supply.
Note: This diagnostics interrupt
must be enabled before it can
The red 5VF LED is on. be reported.
or
13
4
FM positioning,
voltage
monitoring +/15V
Missing encoder supply The 24 V input to the FM 352-5 Incorrect wiring of the 24 V
voltage (3L)
3L is not present or is below
supply to the FM 352-5 3L
specified
minimum
voltage.
terminal.
The red IOF LED is on.
Short-circuit or overload at the
5 VDC encoder supply.
The voltage is not 20.4 to 28.8
V at the 3L terminal.
Other FM positioning
diagnostics are invalid if this
error occurs.
The terminals are not screwed
tight.
The terminal strip is not seated
Note: This diagnostics interrupt correctly.
must be enabled before it can
The 5 V DC supply wiring is
be reported.
incorrect.
Short-circuit or overload at the
5 VDC encoder supply.
19
2
Channel 0
digital output
short circuit
20
2
Channel 1 . . .
21
2
Channel 2 . . .
22
2
Channel 3 . . .
23
2
Channel 4 . . .
24
2
Channel 5 . . .
25
2
Channel 6 . . .
26
2
Channel 7 . . .
Channel x is
overloaded.
The red IOF LED is on.
The FM 352-5 output Qx is
shorted or has been
overloaded.
The connecting wires or the
load have intermittent or
continuous faults.
This diagnostics function is
only activated if the channel is
enabled and a fault has
occurred.
The load is above the
maximum current rating.
The output is switching beyond
the maximum specified
Note: This diagnostics interrupt operating frequency.
must be enabled before it can
be reported.
FM 352-5 high-speed Boolean processor
Operating Manual, 05/2011, A5E00131318-04
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