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Reliance Electric 57400-B 16‑point 115 V AC/DC input module

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Reliance Electric 57400-B 16‑point 115 V AC/DC input module
May 30, 2026

Reliance Electric 57400-B 16‑point 115 V AC/DC input module

Reliance Electric 57400-B (also written as 0-57400-B) is a 16‑point 115 V AC/DC input module for the AutoMax PLC/DCS platform (Reliance Electric / ABB). It is functionally equivalent to 57400-1, but with B‑revision hardware (component/layout tweaks, no functional change). Discontinued; only refurbished/used stock available for legacy system maintenance.

Description

Product Introduction

Reliance Electric 57400-B (also written as 0-57400-B) is a 16‑point 115 V AC/DC input module for the AutoMax PLC/DCS platform (Reliance Electric / ABB). It is functionally equivalent to 57400-1, but with B‑revision hardware (component/layout tweaks, no functional change). Discontinued; only refurbished/used stock available for legacy system maintenance.

Model Interpretation

  • 57400‑B: Base part number, B = hardware revision B

  • 0‑57400‑B: Full AutoMax part number

  • 57400: Family code = 115 V AC/DC input module

  • B: Revised circuitry, ECO updates, compatibility with later AutoMax racks

Technical Parameters

  • Input type: 115 VAC or 115 VDC (auto‑sensing)

  • Channels: 16 isolated inputs (0–15)

  • On‑state: 70–132 VAC/VDC

  • Off‑state: <40 VAC/VDC

  • Input impedance: ~10 kΩ

  • Response time: <10 ms

  • Backplane power: +5 VDC logic, isolated from field

  • Temperature: –20 °C to +60 °C

  • Humidity: 5%–95% non‑condensing

  • Construction: 19” rack PCB, edge connector, LED per channel

  • Weight: ~0.82 kg

  • Manual: J‑3625 (same as 57400‑1)

Interface & Indicators

  • Field side: 16 screw terminals (0–15) for 115 V signals

  • Backplane: Edge connector for power/data

  • LEDs: 16 channel status; Power/Fault LEDs on front

Core Functions

  • Converts 115 VAC/VDC discrete signals to 5 V logic for AutoMax CPU

  • Galvanic isolation between field and backplane

  • Input filtering/debouncing for noise immunity

  • Channel status reporting to processor

  • Hot‑swap capable (system‑dependent)

Application Scenarios

  • Legacy AutoMax DCS/PLC replacement in manufacturing, power, process

  • Factories with 115 V switches, relays, sensors

  • Paper, steel, chemical, packaging lines

  • Retrofit/maintenance where full system replacement is uneconomical

57400‑B vs 57400‑1

  • Function: Identical (16‑pt 115 V AC/DC input)

  • Revision: 57400‑1 = Rev 1; 57400‑B = Rev B

  • Hardware: B has minor component/layout updates, ECO fixes

  • Compatibility: Both work in all AutoMax racks; B is drop‑in upgrade for 1

  • Availability: 57400‑B more common on secondary market

Operation & Maintenance

  • Static‑sensitive: Use ESD protection

  • Power off before insertion/removal/wiring

  • Installation: Seat firmly in rack, secure screws

  • Wiring: 115 V signals to terminals 0–15; common to neutral/ground

  • Maintenance: Keep clean/dry; inspect terminals quarterly

  • Troubleshooting: Check LEDs, field voltage, backplane +5 V; replace if faulty


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