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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power supports sourcing 1771-IM and reviewing exact card identification for existing PLC-5 installations.

        1771-IM

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        1001 reviews ｜ Need a Specific Revision?
        Allen-Bradley 1771-IM reads eight high-voltage AC/DC discrete signals through a 1771 I/O chassis for installed PLC-5 control systems.
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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.
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        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.
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        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.
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        Technical specifications for 1771-IM

        • Manufacturer:
          Allen-Bradley
        • Part Number:
          1771-IM
        • Product Family:
          PLC-5
        • Product Type:
          Digital Input Module
        • Stock:
          1
        • Input Points:
          8 (isolated, 1 common)
        • Nominal Input Voltage:
          220/240V AC (47–63 Hz) or 240V DC
        • Operating Voltage Range (On-state):
          184–276V AC / 184–276V DC
        • Off-state Voltage Range:
          0–92V AC / 0–114V DC
        • Nominal Input Current:
          3.5mA RMS at 220V AC / 3.5mA @ 240V DC
        • Input Signal Delay (AC):
          20±6 ms (on or off)
        • Input Signal Delay (DC On):
          10±4 ms
        • Input Signal Delay (DC Off):
          20±9 ms
        • Backplane Current Draw:
          75 mA
        • Power Dissipation:
          2.4 W (max) / 0.4 W (min)
        • Thermal Dissipation:
          10.9 BTU/hr (max) / 3.2 BTU/hr (min)
        • Opto-electrical Isolation:
          1500V AC (RMS)
        • Operating Temperature:
          0 to 60°C (32 to 140°F)
        • Storage Temperature:
          -40 to 85°C (-40 to 185°F)
        • Relative Humidity:
          5 to 95% (non-condensing)
        • Compatibility:
          PLC-5 1771 I/O chassis
        • Weight:
          0.44 kg
        • Estimated shipping dimensions:
          14.5x3x26cm
        • Tariff Code:
          8537101190
        • 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 Input Response Field Wiring Service Diagnosis Product Applications

        Features:

        • Eight high-voltage AC/DC input points for an installed 1771 I/O rack.
        • Optically isolated, filtered field inputs with documented switching delays.
        • Individual field-side indicators and a removable 1771-WA wiring arm.
        1771-IM lets a PLC-5 installation retain its eight-point high-voltage contact interface during service. The field circuit remains tied to the existing rack instead of being presented as an interchangeable generic input.

        The input filter has a practical diagnostic consequence: a very short pulse can be absent from the controller image even when the physical contact changes. The published AC and DC response figures help separate timing behavior from an intermittent fault.

        Each front lamp reports voltage at its field input. That makes a dark lamp useful for tracing a field circuit, while a lit lamp still calls for a separate check of the controller slot and point mapping.

        1771-IM | Manufacturer: Allen-Bradley | Product Type: Digital Input Module. Apter Power supports exact-model documentation review, quotation and sourcing for this discontinued module.
        Allen-Bradley 1771-IM Digital Input Module Manuals,Datasheets,Link 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.
        • The 1771-IM AC and DC paths have different published turn-on delays; identify the actual field supply before interpreting a missed pulse.
        • The turn-off response is slower than an instantaneous contact change, so an input trace should be compared with the module delay as well as the PLC scan.
        • The stated on-state band gives a measured boundary for a contact that has closed but does not register.
        • The off-state limit helps investigate a point that remains indicated after an electronic field device opens.
        • The 1771-WA arm carries the eight input terminals; its installed terminal map should travel with the replacement request.
        • Rockwell diagrams the AC low and high connections separately from the DC common path, so trace the actual field supply before work on the arm.
        • Each point has a corresponding front indicator for field-side voltage, supporting terminal-by-terminal tracing.
        • The 1771-IM eight-point connection diagram is not the sixteen-point 1771-IMD diagram; keep the full module marking visible during service planning.
        • For a dark point lamp, measure the voltage on that input terminal while the field device is actuated.
        • For a lit lamp but missing PLC bit, compare the energized terminal with the configured slot and point address.
        • For a point that will not release, measure the open-device residual signal and compare it with the module off-state figures.
        • For a pulse that does not appear, compare the measured pulse duration with the appropriate AC or DC delay before replacing hardware.
        • 1771-IM is documented for installed 1771 racks handling high-voltage discrete input circuits.
        • Rockwell names limit, selector, float and pushbutton switches as field-device examples for this input module.
        • Its eight separate points let a PLC-5 controller observe individual contact states in an existing machine sequence.
        • Legacy service projects use the full 1771-IM identity to preserve the original point map and wiring-arm context.
        Description
        1771-IM is an Allen-Bradley eight-point AC/DC input module for a 1771 I/O chassis. It reports discrete field states to the installed PLC-5 control system.

        When replacing 1771-IM, check the complete module marking, wiring arm, point map and recorded input circuit. Its field-side indicators can assist troubleshooting, but they do not replace a qualified circuit assessment.

        Rockwell lists 1771-IM as discontinued. Keep the rack and program records with the spare request so the correct legacy input card can be selected and validated under the site service procedure.
        Revisions

        Revision Part #

        Also known as

        1771-IM Ser A
        1771-IM/A, Series A, Rev A
        Get Parts Quote
        Alternative Names
        1771IM 1771 IM 1771-1M I771-IM
        Technical notes
        Rockwell documents 1771-IM and 1771-IMD as different input modules. The former has eight points and uses the 1771-WA field wiring arm; the latter has sixteen points and a different connection layout. Keep the removed module marking and terminal map together when requesting a replacement.
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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
        A field switch closes but the 1771-IM point lamp stays dark. Where should I start?
        Measure the signal at the corresponding 1771-WA terminal. If the field voltage is below the published on-state band, trace the contact and supply before blaming the input card.
        A 1771-IM lamp is lit but the PLC-5 input bit stays low. Is the lamp proof of a logic one?
        No. The lamp is a field-side indication. Check the slot and point address in the controller input image against the energized terminal before replacing the card.
        The switch opens but my 1771-IM input still appears on. What should I measure?
        Check residual voltage and current at the input while the switch is open. Compare them with the published off-state limits; leakage in the field circuit can hold the input above its off threshold.
        A brief machine contact change is missing from 1771-IM history. Could input timing explain it?
        Yes. Compare the actual pulse width with the documented AC or DC input delay before changing the PLC logic. A pulse shorter than the response window may never appear as a stable input state.
        The spare 1771-IM has arrived without its field connector. Which part should I look for?
        The 1771-IM product data identifies the 1771-WA field wiring arm. Match the installed arm marking and terminal layout before planning the replacement work.
        The removed card has sixteen input positions. Can I identify it as 1771-IM?
        No. Rockwell lists 1771-IM as an eight-point module and 1771-IMD as a distinct sixteen-point module. Read the full removed-card marking before placing the order.

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