1746-NR4 SLC 500™ RTD/Resistance Input Module
A-B 1746-NR4 SLC 500™ RTD/Resistance Input Module
The RTD module receives and stores digitally converted analog data from RTDs or other resistance inputs such as potentiometers into its image table for retrieval by all fixed and modular SLC 500 processors. An RTD consists of a temperature-sensing element connected by 2, 3 or 4 wires that provide input to the RTD module. The module supports connections from any combination of up to four RTDs of various types (for example: platinum, nickel, copper, or nickel-iron) or other resistance inputs. See the input specifications beginning on page 20 for RTD types, their associated temperature ranges, and the analog input signal ranges that each 1746-NR4 channel will support. Each input channel is individually configurable for a specific input device. Broken sensor detection (open- or short-circuit) is provided for each input channel. In addition, the module provides indication if the input signal is out-of-range. The module contains a removable terminal block providing connection for any mix of four RTD sensors or resistance input devices. There are no output channels on the module. Module configuration is done via the user program. There are no DIP switches.
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