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        • Lifecycle status

          Discontinued
          Discontinued date: 2017-03-31
          Replacement category: Functional Replacement

        1756-IT6I2

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Allen-Bradley 1756-IT6I2 is a six-channel isolated ControlLogix thermocouple and millivolt input module with dual cold-junction sensors, filtering, alarms, and open-wire diagnostics.
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        Ships by Wednesday, October 28
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 1756-IT6I2

        • Manufacturer:
          Allen-Bradley
        • Part Number:
          1756-IT6I2
        • Product Family:
          ControlLogix
        • Product Type:
          ControlLogix 6-Channel Isolated Thermocouple and Millivolt Input Module
        • Stock:
          1
        • Input channels:
          6, individually isolated
        • Input functions:
          Thermocouple and millivolt
        • Supported thermocouples:
          B, C, E, J, K, N, R, S, T, D, and TXK/XK(L)
        • Millivolt ranges:
          -12 to 78 mV; -12 to 30 mV
        • Millivolt resolution:
          1.4 μV/bit on -12 to 78 mV range; 0.7 μV/bit on -12 to 30 mV range
        • Resolution:
          16 bit
        • Cold-junction sensors:
          Two
        • Cold-junction terminals:
          3 and 4; 17 and 18
        • Cold-junction sensor error:
          0.3°C from actual
        • Input impedance:
          Greater than 10 MΩ
        • Open-wire response:
          Full positive scale in less than 2 seconds
        • Maximum overvoltage protection:
          120 V AC/DC
        • Normal-mode rejection:
          60 dB at 60 Hz
        • Common-mode rejection:
          160 dB minimum
        • Channel bandwidth:
          15 Hz
        • Settling time:
          Less than 80 ms
        • Converter:
          Sigma-delta
        • Backplane current at 5 V DC:
          200 mA
        • Backplane current at 24 V DC:
          120 mA
        • Power dissipation:
          3.9 W
        • Thermal dissipation:
          13.3 BTU/h
        • Tariff Code:
          8538900000
        • Country of origin:
          USA
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Sensor Match Signal Quality Cold Junction Application
        • Measures six isolated thermocouple or millivolt channels
        • Uses two RTB cold-junction sensors for temperature compensation
        • Combines selectable filtering, alarms, and open-wire detection with 16-bit conversion

        1756-IT6I2 measures very small signals, so correct sensor metallurgy and terminal temperature are part of the measurement chain. Mechanical connection alone does not establish a valid thermocouple channel.

        The two cold-junction sensors compensate different terminal regions. A sensor, polarity, or data-format mismatch can shift readings even when all six inputs remain electrically active.

        Before replacement, verify the thermocouple curve, extension-wire polarity, millivolt range, dual cold-junction placement, RTB terminals, filtering, alarms, shielding, and saved channel configuration.

        Availability, condition, price, and shipping time for 1756-IT6I2 are confirmed during quotation.

        Allen-Bradley 1756-IT6I2 ControlLogix 6-Channel Isolated Thermocouple and Millivolt Input Module Manuals, Datasheets, Links

        Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

        • Configure each channel for the installed thermocouple curve or millivolt range
        • Use matching thermocouple extension wire and preserve polarity
        • Confirm the two cold-junction sensors are installed at the documented RTB terminals
        • Choose a notch filter appropriate for the plant noise environment
        • Maintain shielding, grounding, and isolation for low-level inputs
        • Investigate open-wire full-scale indications before recalibrating a channel
        • Associate channels with the correct cold-junction sensor location
        • Avoid terminal temperature gradients that invalidate compensation
        • Restore compensation and engineering-unit settings from the saved project
        • Multi-channel thermocouple process-temperature measurement
        • Isolated low-level millivolt sensor acquisition
        • Temperature monitoring requiring cold-junction compensation and wire-off diagnostics
        Description
        1756-IT6I2 acquires six isolated thermocouple or low-level millivolt signals for ControlLogix temperature applications.

        It supports the documented B, C, E, J, K, N, R, S, T, D, and TXK/XK(L) thermocouple types, selectable millivolt ranges, notch filtering, process alarms, and two cold-junction sensors.

        Commissioning should reproduce thermocouple type, extension-wire polarity, millivolt range, cold-junction sensor placement, engineering format, filter, alarms, RTB wiring, shielding, and the saved channel configuration.
        Revisions

        Revision Part #

        Also known as

        1756-IT6I2 Ser A
        1756-IT6I2/A, Series A, Rev A
        Get Parts Quote
        Alternative Names
        1756-IT6I2 1756-IT6I2/A Allen-Bradley 1756-IT6I2 Allen Bradley 1756-IT6I2 Rockwell Automation 1756-IT6I2 ControlLogix Thermocouple 1756-IT6I2
        Technical notes
        1756-IT6I2 replacement requires matching thermocouple curve, extension wire, polarity, millivolt range, dual cold-junction sensors, and data format; compensation errors can offset every reported temperature.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Can 1756-IT6I2 use the same extension wire for every thermocouple type?
        No. The extension wire must match the selected thermocouple alloy and preserve polarity; an incorrect wire type or reversed connection introduces measurement error before module configuration is considered.
        Why does 1756-IT6I2 use two cold-junction sensors?
        The module compensates terminal temperature using sensors installed at the documented RTB locations. Both sensor placement and channel association must be correct for accurate thermocouple readings.
        Can 1756-IT6I2 accept a low-level millivolt source instead of a thermocouple?
        Yes. It provides two documented millivolt ranges, but the channel must be configured for the selected range and connected within the isolation and overvoltage limits.
        Can 1756-IT6I2 measure thermocouples accurately if an RTB cold-junction sensor is missing?
        No. Thermocouple operation requires the documented cold-junction sensors at the correct RTB terminals and proper channel association; missing or misplaced compensation can offset otherwise healthy inputs.
        Why can 1756-IT6I2 show an offset on every temperature channel?
        Inspect both cold-junction sensors, terminal placement, compensation settings, ambient gradients, extension-wire type, polarity, grounding, and the selected thermocouple curves before adjusting process calibration.
        Does integer mode on 1756-IT6I2 convert thermocouple signals to temperature?
        No. The official appendix states integer mode reports millivolts and does not perform temperature conversion; floating-point mode is required for the module's temperature-measurement features.
        What can cause a 1756-IT6I2 channel to drive to full scale?
        The module uses a full-positive-scale response for open-wire detection. Check sensor continuity, terminal tightness, extension wiring, RTB jumpers, polarity, and channel configuration.

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