Allen-Bradley 1756-IR6I ControlLogix Analog RTD Module

The 1756-IR6I module provides two data formats such as integer mode and the floating-point mode. When choosing the integer mode, the integrated features are multiple input ranges, notch filter, and real-time sampling. The floating mode includes all these features with the addition of temperature linearization, process alarms, rate alarms, and digital filtering. It also has selectable temperature unit to such as Celsius or Fahrenheit. There are Four (4) possible input ranges for the module including 1 to 487 m?, 2 to 1000 m?; 4 to 2000 m?;, and 8 to 4000 m?;. These ranges designate the minimum and maximum signals detectable by the module. It has Six (6) individually isolated RTD inputs and a resolution of 16 bits. Actual resolution includes 7.7 m?bit for 1-487 Ohms; 15 m?/bit for 2-1000 Ohms, 30 m?/bit for 4 - 2000 Ohms and 60 m?/bit for 8 - 4020 Ohms. The module’s notch filter line noise filtering. Make sure to choose the filter that closely matches the application’s anticipated noise frequency. The digital filter smoothens data by eliminating noise transients on each input channel. The 1756-IR6I’s real-time sampling feature lets the module multicast data it gathered from scanning all of its input channels. To enable multicast, configure Real-Time Sampling (RTS) period and a Requested Packet Interval (RPI) period.

Technical specifications for 1756-IR6I

ManufacturerRockwell Automation

BrandAllen-Bradley

Part Number/Catalog No.1756-IR6I

SeriesControlLogix

Inputs6-Point Isolated RTD

Module TypeAnalog RTD Module

Compatible RTD TypePlatinum 100, 200, 500, 1000 ? , alpha=385; Platinum 100, 200, 500, 1000 ? Platinum, alpha=3916; Nickel 120 ?, alpha=672, Nickel 100, 120, 200, 500 ? , alpha=618

Resolution16 bits 1…487 ?: 7.7 m?/bit 2…1000 ?:15 m?/bit 4…2000 ?:30 m?/bit 8…4020 ?:60 m?/bit

Input Range1…487 ? 2…1000 ? 4…2000 ? 8…4000 ?

Module Scan Time25 ms min floating point (ohms) 50 ms min floating point (temperature) 10 ms min integer (ohms)(1)

Maximum Input Current, Off-State2.75 milliamperes

Data FormatInteger mode (left justified, 2s complement) IEEE 32-bit floating point

Backplane Current (5Volts)250 milliamps

Backplane Current at 24 Volts2 milliamperes

Backplane Current (24 Volts)125 milliamps

Power Dissipation (Max)4.3 Watts

Removable Terminal Blocks1756-TBNH, 1756-TBSH