Rockwell Automation T743x-xx ICS Regent+Plus RTD Input Equipment - Manual (Page 15)

RTD Input Equipment (T7432)
P D - 7 0 3 7 M a r - 0 6
15
Table 1. Temperature Data Ranges.
Out-of-Range Detection
When the RTD measures temperatures outside of the
operating range listed in Table 1, the signal is considered to
be out-of-range. The RTD equipment will continue to provide
over-range and under-range readings up to the minimum and
maximum readings shown in the Table.
Also, many open-circuit and short-circuit wiring faults will
cause out-of-range conditions for RTD inputs. In these cases,
the temperature data value is the minimum or maximum
value shown in the Table.
When the signal is out-of-range, the NOSIG bit for the RTD
input is set. In application programming, the NOSIG contact
in ladder logic can be used to sense the RTD out-of-range
condition. For more information, see Programming, starting
on page 23.
Installation Planning
Accuracy Considerations
Use the following guidelines to maximize overall system
accuracy: