ABB DSDX451L
ABB DSDX451L
ABB DSDX451L
ABB DSDX451L
ABB DSDX451L
ABB DSDX451L
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DSDX451L

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ABB DSDX451L is an S400 remote I/O expansion unit combining 20 digital inputs with 12 low-current relay outputs for documented Advant Controller installations.
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Technical specifications for DSDX451L

  • Manufacturer:
    ABB
  • Part Number:
    DSDX451L
  • Product Family:
    ABB Advant OCS and Advant-800xA
  • Product Type:
    Remote I/O Expansion Unit
  • Stock:
    1
  • Digital Inputs:
    20
  • Input Voltage:
    24 V DC
  • Digital Outputs:
    12 relay outputs
  • Output Isolation:
    Completely separated relay contacts
  • Output Circuit Range:
    24 to 240 V AC or DC
  • Low-current Contact Version:
    L suffix
  • Maximum Contact Load:
    200 mA
  • Recommended Minimum Contact Load:
    5 mA or 0.05 VA
  • AC Supply:
    120 / 220 (230) / 240 (230) V AC, 50/60 Hz
  • Documented Migration Termination Unit:
    TU407 when used in the applicable S400 assembly combination
  • Dimensions:
    23.7 × 21.8 × 8.7 cm
  • Weight:
    2.72 kg
  • Tariff Code:
    8538900000
  • Country of origin:
    Sweden
  • 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 Contact Limits Assembly Fit Migration Application
  • ABB identifies DSDX451L as an S400 digital expansion unit.
  • It combines 20 digital 24 V DC inputs with 12 separated relay outputs.
  • The L suffix denotes the low-current relay-contact version with model-specific load limits.

DSDX451L is an ABB remote I/O expansion unit for documented Advant Controller 450 S400 assemblies.

Its mixed I/O arrangement extends the companion digital basic unit while retaining 24 V input service and isolated low-current relay switching.

Before installation or replacement, verify the companion basic unit, expansion connection, L-suffix contact loading, field supply, rack wiring, and controller channel map.

Availability, condition, price, and shipping time for DSDX451L are confirmed during quotation.

ABB DSDX451L Remote I/O Expansion Unit 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.

  • The L version uses relay contacts intended for low-current output circuits.
  • The documented maximum is 200 mA, subject also to the applicable 5 VA or 5 W limit.
  • The recommended minimum load is 5 mA or 0.05 VA, which must be considered during troubleshooting.
  • DSDX451L operates as an expansion unit rather than a standalone S400 basic unit.
  • The companion unit supplies the documented expandable mixed-I/O arrangement.
  • Expansion connectors, terminal references and saved channel assignments must remain aligned with the installed pair.
  • ABB lists TU407 for specific S400 mixed-I/O combinations that include DSDX451L.
  • The migration unit is designed to retain the existing S400 field-wiring connectors and footprint.
  • Verify the complete basic-plus-expansion combination before selecting the S800 termination assembly.
  • Expansion of 24 V digital input capacity in ABB S400 I/O stations.
  • Low-current relay switching for isolated 24 to 240 V AC or DC control circuits.
  • Mixed digital input and relay-output service in documented Advant Controller 450 assemblies.
Description
DSDX451L is an ABB S400 remote I/O expansion unit used with documented Advant Controller 450 digital I/O assemblies.

The unit combines 20 digital 24 V DC inputs with 12 completely separated low-current relay outputs for 24 to 240 V AC or DC circuits.

Before installation or replacement, confirm the L suffix, companion basic unit, output load, field supply, connector set, rack wiring, and the applicable S400-to-S800 migration arrangement.
Alternative Names
DSDX451L DSDX 451L DSDX-451L ABB DSDX451L ABB DSDX 451L ABB DSDX-451L EXC5716075-AH DSDX451L EXC5716075-AH
Technical notes
DSDX451L is the low-current S400 expansion version; verify its companion basic unit, 24 V input wiring, relay burden, L-suffix contact limits, and migration termination 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.
Why must the L suffix be retained when ordering ABB DSDX451L?
ABB uses the L suffix for the low-current relay-contact version. Its documented loading limits differ from units without L, so a visually similar DSDX 451 cannot be selected from the base number alone.
Which basic unit should be checked before replacing ABB DSDX451L?
Identify the companion S400 basic unit and complete expansion arrangement. ABB documents DSDX451L within combinations such as the DSDX452L plus DSDX451L assembly, so the expansion unit must match the installed base.
Can ABB DSDX451L relay outputs switch every 24 to 240 V load directly?
No. Although the contacts cover documented AC/DC circuit voltages, the L version is limited to low-current service. Confirm the load current, VA or watt burden, power factor, and inrush before connecting it.
What input behavior should be expected from ABB DSDX451L?
ABB documents 20 digital 24 V inputs with the same input qualities as DSDI452. Preserve the companion unit, signal return arrangement, field supply, and installed channel map when servicing the expansion unit.
Is ABB DSDX451L compatible with the TU407 migration termination unit?
ABB lists TU407 for specific S400 combinations including DSDX452L plus DSDX451L. Compatibility depends on the complete paired assembly and existing field connectors, not on DSDX451L alone.
What should be recorded before removing ABB DSDX451L from an S400 station?
Record the companion basic-unit identity, expansion connector positions, input and relay-output assignments, field voltage, low-current loads, supply selection, and any planned S400-to-S800 termination mapping.
Why can an ABB DSDX451L output remain inactive after replacement?
Check the low-current load against the documented minimum, then verify the companion base, output common, expansion connection, field supply, fuse or protection path, and the controller command assigned to that relay channel.