AB 1747-L20C
AB 1747-L20C
AB 1747-L20C
AB 1747-L20C
AB 1747-L20C
AB 1747-L20C
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1747-L20C

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Allen-Bradley 1747-L20C is a fixed SLC 500 controller with 12 24 V DC sinking inputs, 8 AC/DC relay outputs, and a dedicated high-speed counter input.
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Technical specifications for 1747-L20C

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1747-L20C
  • Product Family:
    SLC 500
  • Product Type:
    Fixed SLC 500 Controller
  • Stock:
    1
  • Inputs:
    12 × 24 V DC sinking inputs
  • Input 0:
    High-speed counter input
  • Outputs:
    8 × AC/DC relay outputs
  • User Memory:
    1K instruction capacity
  • Communication:
    DH-485 network; RS-232 requires a compatible interface module such as 1747-KE or 1770-KF3
  • Input Range:
    10–30 V DC
  • Input Delay:
    8 ms maximum on/off
  • Relay Output Range:
    5–265 V AC or 5–125 V DC
  • Relay Current:
    2.5 A per output; 8 A per group
  • 24 V DC User Power:
    200 mA
  • Maximum Heat Dissipation:
    21.0 W
  • Power Supply Range:
    21.6–26.4 V DC
  • Dimensions:
    16.50 × 17.10 × 14.50 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 Integrated I/O High-Speed Input Communications Application
  • Fixed SLC 500 controller with 12 24 V DC sinking inputs and 8 AC/DC relay outputs
  • Input 0 provides the documented high-speed counter function
  • DH-485 controller networking; RS-232 requires compatible interface equipment

1747-L20C is an Allen-Bradley fixed SLC 500 controller with integrated 20-point I/O and a dedicated high-speed counter input.

The controller combines 24 V DC sinking inputs, AC/DC relay outputs, user 24 V DC power, and a fixed SLC 500 processor in one unit.

Use the documented DH-485 arrangement for controller networking; RS-232 connections require a compatible interface module such as 1747-KE or 1770-KF3.

Availability, condition, price, and shipping time for 1747-L20C are confirmed during quotation.

Allen-Bradley 1747-L20C Fixed SLC 500 Controller Manuals, Product Family, 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.

  • Match field devices to the documented sinking-input arrangement
  • Review relay contact load requirements before connecting loads
  • Keep input and output commons consistent with the wiring diagram
  • Use the high-speed input arrangement documented for the L20C
  • Separate pulse wiring from high-noise conductors where required
  • Confirm program scaling and counter operation before machine use
  • DH-485 network support for the fixed SLC 500 controller
  • RS-232 connectivity through compatible interface equipment such as 1747-KE or 1770-KF3
  • Verify node, baud, cabling, and protocol settings after replacement
  • Fixed SLC 500 machine control with integrated discrete I/O
  • Pulse or count applications using input 0 high-speed counter
  • DH-485-connected SLC 500 systems using compatible link equipment
Description
1747-L20C is an Allen-Bradley fixed SLC 500 controller with integrated 20-point I/O and a dedicated high-speed counter input.

The controller combines 24 V DC sinking inputs, AC/DC relay outputs, and DH-485 networking; RS-232 communication requires a compatible interface module such as 1747-KE or 1770-KF3.

Before replacement, verify field-device polarity, relay load and suppression, high-speed counter wiring, user-memory contents, DH-485 settings, RS-232 interface equipment, and the complete fixed-controller catalog number.
Alternative Names
1747-L20C 1747 L20C 1747L20C Allen-Bradley 1747-L20C Rockwell Automation 1747-L20C SLC 500 1747-L20C
Technical notes
1747-L20C combines sinking DC inputs, relay outputs, and high-speed input capability in a fixed controller. Verify field-device polarity, relay loads, program, and communications 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.
Does Allen-Bradley 1747-L20C accept sourcing sensors?
The L20C uses sinking DC inputs, so connected field devices must provide the compatible sourcing signal arrangement.
Can Allen-Bradley 1747-L20C relay outputs directly switch every load?
No. Check the documented relay contact ratings, load characteristics, suppression needs, and external protection for the actual circuit.
Why is a saved program essential before replacing Allen-Bradley 1747-L20C?
The replacement controller must contain the correct logic, communications, and I/O behaviour. Retain a verified copy before removing the original unit.
How does Allen-Bradley 1747-L20C connect to an RS-232 device?
The fixed controller is documented as a DH-485 network responder. An RS-232 connection requires a compatible interface module such as 1747-KE or 1770-KF3, plus the correct cable and DF1/DH-485 settings.
What should be reviewed when the high-speed input counts incorrectly on Allen-Bradley 1747-L20C?
Check sensor output type, pulse integrity, wiring route, program scaling, input configuration, and the machine’s actual event rate.
Can a later fixed SLC model be substituted for Allen-Bradley 1747-L20C without changes?
No. Compare I/O type, program support, communications, physical wiring, and field-load requirements before approving any substitution.
Why should relay and DC input wiring be documented for Allen-Bradley 1747-L20C?
Integrated I/O means a replacement can affect several field circuits. Accurate terminal records reduce wiring and control-behaviour errors.