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1771-OM

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Allen-Bradley 1771-OM is an eight-point 220/240 V AC output module for a 1771 I/O chassis in PLC-5 systems, with individual output status indicators and a fuse-blown indicator.
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Technical specifications for 1771-OM

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1771-OM
  • Product Family:
    PLC-5
  • Product Type:
    Digital Output Module
  • Stock:
    1
  • Output Voltage Range:
    184-250 V AC, 47-63 Hz
  • Output Current:
    2 A per output
  • Output Channels:
    8
  • Maximum Module Current:
    6 A
  • Surge Current:
    20 A for 100 ms; repeatable every 10 s
  • Minimum Load Current:
    60 mA per output at 220 V AC, 60 Hz
  • Signal Delay:
    1 ms OFF-to-ON; 8.3 ms ON-to-OFF at 60 Hz
  • On-State Voltage Drop:
    1.6 V maximum at 2 A
  • Off-State Leakage Current:
    2 mA maximum per output at 220 V AC
  • Power Dissipation:
    1.2 W minimum; 13.2 W maximum
  • Thermal Dissipation:
    4.1 BTU/hr minimum; 45.1 BTU/hr maximum
  • Backplane Current:
    225 mA at 5 V DC ±5%
  • 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
  • Output Fuse:
    2 A, 250 V, 3AG normal-blow; one per output
  • Field Wiring Arm:
    1771-WA
  • Conductor Size:
    14 AWG (2 mm²) stranded copper maximum
  • Field Wiring Arm Torque:
    7-9 in-lb
  • Chassis Keying:
    Between backplane connector positions 6-8 and 28-30
  • Weight:
    1.411 lbs (0.64 kg)
  • Estimated shipping dimensions:
    2.8 x 15.2 x 25.9 cm
  • 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 Applications Compatibility Diagnostics & Protection Installation & Integration

Features:

  • Eight-channel AC output module for a 1771 I/O chassis.
  • One status indicator corresponds to each output channel.
  • A separate fuse-blown indicator reports an open output fuse.
1771-OM is an Allen-Bradley 1771-series AC output card for installed PLC-5 I/O systems.

Rockwell product data distinguishes 1771-OM from other 1771 output models and identifies eight outputs and a fuse-blown indication.

Output load selection and field wiring require the exact revision data and a qualified electrical review; this overview is not a circuit design or compatibility approval.

Apter Power supports exact-model documentation review and sourcing for the Allen-Bradley 1771-OM AC output module.
Allen-Bradley 1771-OM Digital AC Output 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.
  • Exact-model spare for an installed 1771 chassis using an AC output card.
  • Maintenance of legacy PLC-5 output channels where 1771-OM is recorded.
  • Part identification during a 1771 I/O migration or controls retrofit.
  • Confirm 1771-OM on the removed module label; 1771-OA, OMD and OQ16 are separate products.
  • Check the installed 1771 chassis and original field wiring arm identification.
  • Have an electrical specialist compare the actual load and circuit with the exact Rockwell product data before selection.
  • Compare the eight output indicators and the fuse-blown indicator with the controller command and fault record.
  • An illuminated output indicator does not by itself confirm that the external load is energized.
  • Investigate the field circuit and module only through the site-approved electrical diagnostic procedure.
  • Record each original 1771-OM output assignment and terminal connection under the site change procedure.
  • Use revision-specific wiring and safety documentation; the model name alone does not establish a load match.
  • Follow qualified isolation, testing and return-to-service practices for the installed circuit.
Description
Allen-Bradley 1771-OM is an eight-point 220/240 V AC digital output module for the 1771 I/O chassis. Each output switches an AC field load and has its own status indication and fuse protection for clear channel-level maintenance.

The module lets PLC-5 application logic operate contactors, solenoids, lamps, and other compatible AC devices while respecting the documented per-point and total-module current limits. Its removable 1771-WA field wiring arm retains the plant conductors when the electronics are removed from the chassis.

Selection and commissioning must check load current, inrush, leakage sensitivity, AC phase, fuse type, chassis keying, and wiring-arm torque. De-energize both chassis and field power before service, because output terminals can remain hazardous even when processor logic is off.
Revisions

Revision Part #

Also known as

1771-OM Ser A
1771-OM/A, Series A, Rev A
Alternative Names
1771OM Allen-Bradley 1771-OM Allen Bradley 1771 OM Allen-Bradley 1771-OM AC Output Module 1771 OM Allen-Bradley Bulletin 1771 AC Output Module Allen-Bradley PLC-5 1771-OM Output Module Allen-Bradley 1771-OM Eight-Point Output
Technical notes
1771-OM field circuits must be checked for AC load current, inrush, leakage sensitivity, fuse protection, and phasing; isolate chassis and field power before removing the 1771-WA arm.
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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.
What does the indicator bank show on Allen-Bradley 1771-OM?
Rockwell identifies one indicator for each of the eight outputs. Compare its indication with the controller command and site fault record; the lamp alone does not confirm power at the external load.
What does the fuse-blown indicator mean on Allen-Bradley 1771-OM?
The indicator flags a blown fuse condition on the module; it is a diagnostic cue, not a field-circuit test result. Follow the OEM isolation and service instructions before inspection.
Can another 1771 AC output card directly replace Allen-Bradley 1771-OM?
No. Similar appearance is not proof of interchangeability; compare the full catalog number, output type, chassis, load circuit and applicable ratings.
What circuit conditions must be checked when Allen-Bradley 1771-OM drives 1771-IM or 1771-IMD?
Rockwell specifies a 3.3 kΩ, 20 W resistor for driving a 1771-IM, or a 10 kΩ, 10 W resistor for a 1771-IMD, with both modules powered from the same source for proper phasing. Verify the exact wiring instructions before work.
What identification details are needed to assess an Allen-Bradley 1771-OM replacement?
Record the full catalog number and series, chassis slot, wiring arm, load and circuit drawings, output assignments, and source/phasing arrangement for engineering review.
Which references cover Allen-Bradley 1771-OM wiring and ratings?
Rockwell 1771-TD182 gives product ratings; 1771-TD018 provides 1771-OM wiring instructions and resistor/source conditions for specified 1771-IM and 1771-IMD circuits.

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