Rockwell Automation T80020 Application Note Diagnostic Procedures - Manual (Page 64)

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AN-T80020 Diagnostics Procedure
Issue 12 Feb 11 AN-T80020 64
INPUT_CHANNEL_OVC
0x6Enn
Modules:8448, 8449
Subcode:nn = channel, 0x00 to
0x27 (1 to 40) This detects an over-current trip on an input channel. Input channels
should not have over-current trips; this implies the channel output
circuits have energised.
Return the module for repair.
Action:Slice fault
SFIU_VMON_QUAD_DISCREP
0x6Emn
Modules:8442
Subcode:m = (see right), n =
group (0 to 2) Detects discrepancies in the voltage measurement in the relay output
circuits.
m = 0: 24V1 Quadrant 1/Quadrant 2 discrepancy
m = 1: 24V2 Quadrant 1/Quadrant 2 discrepancy
m = 2: 15V1 Quadrant 1/Quadrant 2 discrepancy
m = 3: 15V2 Quadrant 1/Quadrant 2 discrepancy
Return the module for repair.
Action:Slice fault
OFIU_INPUT_FAULT
0x6Fnn
Modules:8448
Subcode:nn = channel, 0x00 to
0x27 (1 to 40) This only applies to 8448 inputs. It tests that the input channel can be
tripped (state 4) and that there is no crosstalk between input channels
or a short to the field supply. It also tests voltage monitoring circuitry
and communications.
It tests the input measurement by turning on the output FETs for 2ms
and looking for a voltage on the test channel and none on the others.
The module must therefore be able to move the channel voltage by
switching the FETs. If the input is volt-free (and closed contact) or
uses zener diodes, the voltage will stick at zero volts or the zener
voltage. To allow the module to manipulate the channel, a 1K resistor is
needed in series with the channel for these inputs. Refer to PD-8842
and TN-20018. In most cases it can be fitted in T8842 socket position
A.
If the channel should be able to drive the input, return the module for
repair.
Action:Slice fault
SFIU_CONTACT_QUAD_
DISCREP
0x6F0n
Modules: 8442
Subcode: n = group (0 to 2) Detects a discrepancy between the two timers that measure the length
of a contact change on the SOFTA diagnostic trace link.
Return the module for repair.
Action:Slice fault