Model Definition

• 0-57C402-C: Full part number

  • Leading 0: Factory‑original, unmodified unit

  • 57C402: Base model (32‑point AC/DC output)

  • ‑C: Conformal coated + industrial extended temperature variant

• 57C402: Core model (standard 32‑point output)

• Series: AutoMax 57C Series (Reliance PLC I/O) / DCS 5000 Series

Technical Specifications

General

• Brand: RELIANCE (Reliance Electric / Baldor Reliance)

• Type: 32‑Point Digital Output Module (AC/DC)

• Form Factor: 1‑slot AutoMax rack‑mount

• Dimensions: 11.75 in (H) × 3.5 in (W) × 1.2 in (D) approx

• Weight: ~1.2 kg (2.6 lbs)

• Operating Temperature: 0°C to +55°C (‑C variant: ‑20°C to +70°C)

• Storage Temperature: ‑40°C to +85°C

• Humidity: 5%–95% non‑condensing

• Isolation: 5000 Vrms channel‑to‑backplane, 4 groups of 4 isolated commons

• Certifications: CE, RoHS, UL listed

Output Ratings

• Total Channels: 32 (4 groups × 8 channels)

• Output Type: Isolated, dry‑contact / solid‑state (selectable)

• Voltage Range: 12–115 VAC / 12–250 VDC

• Current Rating: 2.0 A per channel (max), 8 A per group

• Leakage Current: <1 mA (off‑state)

• Response Time: <1 ms (typical)

• Protection: Overcurrent, short‑circuit, transient voltage suppression

Electrical

• Backplane Power: 5 VDC ±5% (from AutoMax rack)

• Current Draw: 1.0 A (typical), 1.5 A (max)

• Fuse: 2 A onboard fuse (per group)

Interface & Communication Configuration

Physical Interfaces

• Front Panel: 32 output terminals (4 groups: A1–A8, B1–B8, C1–C8, D1–D8); LED status per channel (ON = active)

• Backplane: AutoMax proprietary edge connector (power + Multibus communication)

• LED Indicators:

  • PWR: Backplane power (green = OK)

  • RUN: Module active (steady = run, flash = init)

  • FLT: Fault (red = overcurrent/short)

  • CH1–CH32: Channel status (yellow = ON)

Communication

• Bus Protocol: AutoMax Multibus (parallel, high‑speed)

• Data Rate: 2 Mbps (backplane)

• Compatibility: AutoMax 57C series racks (57C331/332/334 chassis)

• Data Format: 32‑bit output register, parity‑checked

Core Functions

1. 32‑Channel Isolated Output: High‑density on/off control for AC/DC loads.

2. 5000 Vrms Isolation: Protects PLC from field‑side voltage spikes and ground loops.

3. Grouped Outputs: 4 isolated groups (8 channels each) for independent power distribution.

4. LED Channel Monitoring: Quick visual status for each output.

5. Conformal Coating (‑C): Moisture/dust resistance for harsh environments.

6. Fault Detection: Overcurrent/short‑circuit protection with FLT LED alarm.

Application Scenarios

• Legacy AutoMax Retrofits: Direct replacement for 57C402 / 0‑57C402‑C in DCS 5000 systems.

• Factory Automation: Solenoid valves, motor starters, contactors, and relay control.

• Process Control: On/off control in water treatment, packaging, material handling.

• Machine Tool: Actuators, clamps, and auxiliary device control.

• Harsh Environments: Conformal coating suitable for humid, dusty, or vibration‑intensive sites.

Usage & Maintenance Instructions

Installation

1. Power Off: De‑energize the AutoMax rack before insertion.

2. Insert Module: Align with slot, push firmly until backplane connector seats.

3. Secure: Tighten captive screws (torque 0.8–1.0 N·m).

4. Wiring: Connect loads to front‑panel terminals; use isolated power per group for safety.

Operation

• Power‑On: PWR ON; RUN flashes (~5 s) during self‑test.

• Normal: RUN steady; channel LEDs follow output state.

• Fault: FLT red → check wiring/load for short/overcurrent; replace fuse if needed.

Maintenance

• Preventive (Quarterly): Check terminal tightness, LED status, and connector cleanliness.

• Fuse Replacement: Power off rack; replace 2 A group fuse if FLT persists.

• Cleaning: Low‑pressure air (≤2 bar) to remove dust; avoid liquid cleaners.

• Coating Check (‑C): Inspect annually for cracks/peeling in high‑humidity areas.