AB 1746-IO8
AB 1746-IO8
AB 1746-IO8
AB 1746-IO8
AB 1746-IO8
AB 1746-IO8
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1746-IO8

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Allen-Bradley 1746-IO8 combines four 120 V AC inputs and four relay outputs in one SLC 500 slot for compact mixed-I/O control.
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Technical specifications for 1746-IO8

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1746-IO8
  • Product Family:
    SLC 500
  • Product Type:
    4-Input 4-Relay Output Combination Module
  • Stock:
    1
  • Module Type:
    Combination AC input and relay output module
  • Inputs:
    4; 4 points per common
  • Input Voltage:
    120 V AC nominal; 85–132 V AC operating range
  • Outputs:
    4 relay outputs
  • Output Voltage:
    5–265 V AC or 5–125 V DC
  • Number of Inputs:
    4
  • Input Points per Common:
    4
  • Input Voltage Category:
    120 V AC
  • Input Operating Range:
    85–132 V AC at 47–63 Hz
  • Nominal Input Current:
    12 mA at 120 V AC
  • Maximum Input Signal Delay:
    35 ms on; 45 ms off
  • Maximum Off-state Voltage:
    30 V AC
  • Maximum Off-state Current:
    2 mA
  • Maximum Input Inrush Current:
    0.8 A for 0.5 ms maximum
  • Number of Outputs:
    4 relay outputs
  • Output Operating Range:
    5–265 V AC at 47–63 Hz; 5–125 V DC
  • Maximum Output Signal Delay:
    10 ms on; 10 ms off
  • Minimum Output Load:
    10 mA at 5 V DC
  • Weight:
    0.2 kg
  • 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 Point Allocation Load Protection Commissioning Sequence Application
  • Four 120 V AC input points
  • Four relay output points
  • Mixed I/O functions in one SLC 500 slot

1746-IO8 combines four 120 V AC inputs and four relay outputs in one SLC 500 chassis slot. The layout supports compact machines requiring a small mixed-I/O count.

The input section operates from 85–132 V AC. Relay outputs can switch documented AC or DC circuits, subject to point current, module current, inrush, duty, and suppression requirements.

Commissioning must distinguish LED status from field voltage. Rockwell notes that output LEDs may illuminate briefly at startup or when the rack is not yet controlled by the processor.

Availability, condition, price, and shipping time for 1746-IO8 are confirmed during quotation.

Allen-Bradley 1746-IO8 4-Input 4-Relay Output Combination 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.

  • Four 120 V AC input points are assigned to the input section
  • Four relay outputs are assigned to the separate output section
  • Input commons and relay contacts must be mapped separately in the SLC 500 program
  • Match each relay circuit to the connected AC or DC load
  • Check inrush, switching duty, and suppression before energizing a load
  • Keep field protection and commons consistent with the module wiring diagram
  • Verify commons and terminal assignments against the original drawing
  • Do not infer field energization from startup LED status alone
  • Confirm processor control before functional testing of relay outputs
  • Small mixed-I/O machine control
  • Legacy SLC 500 panel maintenance
  • Replacement of a verified 1746-IO8 installation
Description
Allen-Bradley 1746-IO8 is a combination AC input and relay output module for SLC 500 control systems.

The module provides four 120 V AC input points arranged as four points per common and four relay outputs for switching compatible AC or DC loads.

Before installation or replacement, confirm field-voltage compatibility, relay-load requirements, terminal wiring, SLC 500 slot configuration, backplane loading, and enclosure heat dissipation.
Revisions

Revision Part #

Also known as

1746-IO8 Ser A
1746-IO8/A, Series A, Rev A
Alternative Names
1746-IO8 1746IO8 1746 IO8 Allen-Bradley 1746-IO8 Allen Bradley 1746-IO8 Rockwell Automation 1746-IO8 SLC 500 1746-IO8
Technical notes
Allen-Bradley 1746-IO8 combines four AC inputs and four relay outputs. Verify common grouping, contact loading, and controlled-rack startup behavior before 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.
Can existing SLC 500 wiring be transferred directly to a replacement Allen-Bradley 1746-IO8?
Do not transfer conductors by position alone. Separate the AC input wiring from relay-output wiring, verify both common arrangements, and match every terminal with the original drawings.
Are Allen-Bradley 1746-IO8 relay outputs suitable for contactors and solenoids?
They may be suitable when the load duty is compatible. Check coil inrush, switching frequency, contact protection, suppression, and whether an interposing relay is needed for the application.
Why can Allen-Bradley 1746-IO8 output LEDs appear on before the program runs?
Rockwell notes that the indicators can illuminate briefly during power-up or when processor control is absent. Measure the output circuit before concluding that the relay is energized.
What common wiring should be checked on Allen-Bradley 1746-IO8?
Confirm the input common, relay common arrangement, source voltages, and terminal labels against the installation drawing. Do not bridge commons merely because the circuits share one module.
How should inductive loads be connected to Allen-Bradley 1746-IO8?
Use suppression suited to the load and supply, and place it according to the official wiring guidance. This reduces transients, contact wear, and unintended controller behavior.
Does a replacement Allen-Bradley 1746-IO8 include the removable terminal block?
Do not assume it does. Confirm the seller’s supply scope, terminal-block condition, keying, conductor labels, and compatibility before moving the existing block to another module.
Can Allen-Bradley 1746-IO8 be replaced by a higher-point combination module without program changes?
No. Point mapping, terminal assignments, common arrangements, chassis loading, and program references can change. Treat the conversion as an engineered I/O modification.