Rockwell Automation 1746-INT4 Thermocouple/MV Isolated/ User Manual - Manual (Page 55)

Publication 1746-UM614B-EN-P - September 2007
Channel Configuration, Data, and Status 55
Detected Faults Indicated by Bits 12…15
When the module detects any of the conditions described for bits
12…15, it:
•
sets the corresponding bit.
•
blinks the status LED on the front panel for the channel having
the fault.
The module is designed to detect the following fault conditions.
Open-circuit Detection (Bit 12)
The module tests all enabled channels for an open-circuit condition
each time it scans its inputs. Possible causes of an open circuit
include:
•
broken thermocouple or CJC thermistor.
•
thermocouple or CJC thermistor wire cut or disconnected.
12 Open
Input Diagnostics 0 Condition not detected.
1 Detected open input.
13 Under-
range Diagnostics 0 Condition not detected.
1 Detected under-range input.
14 Over-
range Diagnostics 0 Condition not detected.
1 Detected over-range input.
15 Invalid
Config Diagnostics 0 Condition not detected.
1 Detected invalid configuration.
Channel Status Word, Channels 0…3 (I:e.4 through I:e:.7) — Bit Definitions (Continued)
Bit or
Bits Reflect/
Indicate Configured for With This Bit Code Reflects Configuration in
Bits 0…11 and Indicates
Detected Faults in Bits
12…15
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0