Model Explanation

• 0-57401-1: Base part number; 1 denotes a specific hardware revision (compatible with 61C‑501).

• Alternate P/N: 57401-1, 57401.

• Function Description: 120/240 VAC Digital Input Module (high‑voltage discrete input).

• Compatibility: Exclusive to Reliance AutoMax PLC racks; not compatible with other PLC brands.

Technical Parameters

• Manufacturer: Reliance Electric (Allen‑Bradley/Rockwell Automation)

• Series: AutoMax PLC (Distributed Control System)

• Input Voltage: 120–240 VAC (nominal), 85–264 VAC (operating range)

• Input Type: Isolated discrete input (dry contact or voltage source)

• Number of Channels: 16 isolated input points

• Input Impedance: ≥10 kΩ per channel

• Response Time: ≤15 ms (ON→OFF, OFF→ON)

• Operating Temp: 0°C to +50°C

• Dimensions: 13.5 × 8 × 1.5 in (343 × 203 × 38 mm)

• Weight: Approx. 1.25 lbs (0.57 kg)

• Mounting: Standard AutoMax PLC rack slot (1.25 in width)

Interface & Communication Configuration

• Rack Connector: Edge connector for AutoMax backplane (power, data, addressing)

• Field Terminals: Screw terminals for 120/240 VAC input wiring (16 channels + common)

• Isolation: Optical isolation between field side and logic side (2500 Vrms isolation)

• Indicators: LED status per channel (ON = input active)

• Backplane Communication: Parallel data bus to AutoMax CPU module

Core Functions

1. High‑Voltage Signal Acquisition: Converts 120/240 VAC discrete signals to 5V logic for PLC processing.

2. Electrical Isolation: Protects PLC internal circuits from high‑voltage transients and noise.

3. Channel Status Monitoring: Provides individual LED indication for each input channel.

4. Fault Protection: Built‑in surge suppression and overvoltage protection for field wiring.

5. Rack Integration: Hot‑swappable in AutoMax racks for easy replacement without system shutdown.

Application Scenarios

• Equipment: AutoMax PLC systems (Reliance distributed control platform).

• Industries: Power generation, oil & gas, metal processing, and heavy machinery requiring 120/240 VAC signal interfacing.

• Signals: Limit switches, relay contacts, motor starters, and high‑voltage sensor outputs.

Operation & Maintenance Instructions

Installation

• Power OFF the AutoMax rack before installation.

• Insert the module into an empty rack slot; secure with front‑panel latches.

• Wire 120/240 VAC field signals to the screw terminals (follow channel numbering).

• Power ON; verify module recognition via AutoMax CPU and channel LED status.

Maintenance

• Quarterly: Inspect terminal connections for tightness; check LED operation.

• Semi‑annually: Power OFF, clean the module with dry, lint‑free cloth under ESD protection.

• Replacement: Use only original 0-57401-1 modules; no configuration required (auto‑detected by CPU).

Troubleshooting

• No Channel LED: Verify 120/240 VAC field power and wiring; check for open circuit.

• False Input Triggering: Inspect for voltage transients; verify isolation and grounding.

• Module Not Recognized: Check backplane connector seating; verify rack power supply.

Precautions

• High voltage present on field terminals; disconnect power before servicing.

• Use ESD wristband when handling the module to prevent static damage.

• Do not exceed 264 VAC input voltage to avoid module damage.