Specifications

Analog Input Modules
31007715 6/2008 167
Bit meanings are described below:
Bit Indication Meaning
0 global status channel
(GSC)
The value is 0 when no errors have been detected. It is 1
when one or more of the bits1, 3, 5, 6 and 7 has a value of 1.
1 PDM voltage status on
the sensor bus
The value is 0 when no PDM voltage errors are detected. It
is 1 if sensor power is absent. A PDM short turns on the
GSC bit (bit 0).
2 over-range warning
(ORW) status
The value is 1 when the input sensor value is over the
normal temperature or mV range (see p. 161). An ORW
does not turn on the GSC bit (bit 0).
3 over-range error (ORE)
status
The value is 1 when the input sensor value is in the ORE
temperature or mV range (see p. 161). An ORE turns on the
GSC bit (bit 0)
4 under-range warning
(URW) status
The value is 1 when the input sensor value is in the URW
temperature or mV range (see p. 161). (A URW does not
turn on the GSC bit (bit 0).
5 under-range error
(URE) status
The value is 1 when the input sensor value is in the URE
temperature or mV range (see p. 161). A URE turns on the
GSC bit (bit 0).
6 broken wire detection
(BWD) status
The value is 1 when the channel is configured for an RTD or
TC sensor and it detects a broken wire. if you have a mV
sensor connected to the channel, BWD does not work.
When the channel is configured for a TC sensor, the bit may
also be set when external cold-junction compensation is
used and a broken wire is detected in the RTD connection.
In this case, the cold-junction compensation data will be
near 0 and the TC data will be uncompensated.
BWD turns on the GSC bit (bit 0).
7 internal module error
(INT) status
Internal hardware/firmware error has been detected or
differential between two internal sensors is in excess of
10 degrees C.
Note: The detection of error conditions on the PDM input power connection may
be delayed by as much as 15 ms from the event, depending on the sensor bus
load, the system configuration and the nature of the fault.
Field power faults that are local to the input module are reported without delay.
Note: If the INT bit is set, you need to either cycle power or hot swap the module
to reset the bit. If the bit does not reset, the module needs to be replaced.
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