TMEICA ARND-3115A18

Technical Specifications

1. Total Output Channels: 16 independent discrete switching channels, grouped into two isolated 8-channel banks
2. Output Driving Type: NPN sinking transistor output
3. Nominal Field Load Supply Voltage: 24 VDC; allowable input range: 18 VDC ~ 30 VDC
4. Single Channel Continuous Rated Current: 0.7 A DC
5. Peak Inrush Current Tolerance Per Channel: 2 A (max 100 ms transient)
6. Maximum Group Total Current: 5 A per 8-channel isolated group
7. Galvanic Isolation Strength: 2000 VDC optical isolation between rack backplane logic and field load circuits
8. Backplane Communication Bus: TMEIC proprietary high-speed dual industrial PLC backplane bus
9. Channel Switch Response Delay: ≤85 μs turn-on / ≤70 μs turn-off
10. Built-In Surge Suppression Rating: TVS array rated for 60 V reverse inductive kickback absorption
11. Operating Ambient Temperature Range: -15 °C ~ +65 °C cabinet internal temperature
12. Storage Temperature Range: -40 °C ~ +90 °C
13. Physical Dimension: 110 mm Height × 34 mm Width × 120 mm Depth, single-width standard PLC rack footprint
14. Ingress Protection: IP20, indoor cabinet-only installation
15. Net Weight: 0.31 kg

Functional Features

1. Custom A18 hardware upgrade adds reinforced TVS diode networks on every channel to withstand extreme back EMF from large industrial inductive loads
2. Independent per-channel short-circuit electronic cutoff; fault flag transmitted to main CPU via backplane without full-module shutdown
3. Two electrically separated 8-channel banks support dual independent external 24VDC power domains for zone-isolated process safety circuits
4. Configurable fault hold logic: outputs latch open-circuit/short-circuit fault state until manual CPU reset command
5. User-selectable fail-safe mode: de-energize all outputs or maintain last operating state during backplane communication loss
6. Individual red LED status indicator for each channel to visualize ON/OFF switching status and fault alarm condition
7. Full hot-swap compatible design; module insertion/removal permitted without full PLC rack power isolation
8. Logic circuit power supplied entirely by rack backplane; no separate auxiliary control power terminal required

Working Principle

Material Composition

1. Enclosure Housing: UL94-V0 flame retardant black ABS injection molded plastic shell
2. Main Circuit PCB: High-temperature FR-4 fiberglass substrate, lead-free tin-copper surface plating
3. Isolation Hardware: Reinforced double-channel optical couplers with 2000 VDC insulation rating
4. Switching Devices: Low Vce(sat) high-current NPN power transistors
5. Surge Protection Components: High-power bidirectional TVS diodes customized for A18 variant
6. Wiring Terminal Block: PA66 glass-filled insulated screw terminals with pure copper conductive inserts

Structural Characteristics

1. Standard single-width 34 mm vertical stacking form factor compatible with all TMEIC ARND series I/O rack modules
2. Rear panel integrated gold-plated multi-pin spring contacts for backplane bus communication and logic power feed
3. Front detachable screw terminal block enables full field wiring disconnection without module extraction from rack
4. Internal PCB partition metal shielding separates backplane logic zone and field power switching zone to reduce crosstalk
5. Side mechanical locking buckle secures module firmly to rack DIN rail to resist high-vibration metallurgical plant operating conditions

Advantage Highlights

1. Custom A18 enhanced surge protection eliminates auxiliary suppression components for heavy inductive industrial loads, reducing cabinet wiring complexity
2. 0.7 A single-channel continuous current rating exceeds standard ARND series models to drive large contactors and hydraulic solenoid valves
3. 2000 VDC high isolation rating prevents cross-circuit interference in heavy electromagnetic interference industrial environments
4. Per-channel independent fault protection restricts failure impact to a single field actuator instead of entire output group
5. Extended -15 °C low-temperature operating capability suits uninsulated outdoor auxiliary control cabinets at power plants and mine sites
6. Hot-swap maintenance design eliminates full rack power shutdown, reducing industrial production downtime during I/O module replacement

Applicable Industries

Installation Requirements

1. Install module exclusively within IP54 or higher rated industrial PLC control cabinet; prevent direct exposure to dust, water vapor, sulfur-containing corrosive gas
2. Field actuator wiring must adopt shielded twisted pair cable; cable shielding single-point grounded at cabinet main terminal strip only
3. Each external 24VDC load power circuit fitted with 12 A rated overcurrent circuit breaker per module
4. Maintain minimum 15 mm vertical airflow clearance between adjacent rack I/O modules for passive heat convection
5. PLC rack metal frame connected to dedicated equipment protective earth bus to suppress radiated electromagnetic interference

Usage Precautions

1. Forbid connecting field load voltage exceeding 30 VDC to output terminals; permanent breakdown of internal power transistors occurs instantaneously
2. Large inductive loads over 0.5 A must verify transient inrush current does not exceed 2 A 100 ms peak limit
3. Execute channel fault detection calibration every 12 months for safety-critical interlock and shutdown circuits
4. Disconnect external 24VDC field power before detaching front wiring terminal block to avoid accidental channel short-circuit
5. Store spare modules in constant low-humidity anti-static packaging to prevent optical coupler electrostatic discharge damage