Honeywell 2MLQ-TR4B 32-Point Transistor Digital Output Module

Product Overview

The Honeywell 2MLQ-TR4B is a 32-point transistor digital output module designed for the MasterLogic-200 (ML200) PLC system. Featuring source-type transistor outputs with photo-coupler isolation, this high-density module delivers fast, reliable switching for relays, solenoids, indicators, and other low-power DC loads. With a ≤1 ms response time and compact footprint, the 2MLQ-TR4B is ideal for real-time industrial automation in space-constrained control cabinets.

Key Features

• 32 high-density transistor output points (source type)
• Fast switching: ≤1 ms On/Off response time
• Rated load voltage: DC 12 V / 24 V
• Photo-coupler isolation for enhanced signal integrity and noise immunity
• Zener diode surge protection per IEC 61000-6-2
• 40-pin connector for compact, organized field wiring
• Individual LED status indicators for each output channel
• Compact design — 170 × 98 × 19 mm, 0.26 kg

Technical Specifications

• Model: 2MLQ-TR4B
• Product Type: Digital Output Module (Transistor, Source Type)
• Series: MasterLogic-200
• Output Channels: 32 points
• Output Type: Transistor (Source Type)
• Rated Load Voltage: DC 12 V / 24 V
• Load Voltage Range: DC 10.2 V – 26.4 V
• Max Load Current: 0.1 A per point, 2 A per COM
• Voltage Drop (On): ≤ 0.3 V
• Off Leakage Current: ≤ 0.1 mA
• Inrush Current: 4 A for ≤ 10 ms
• Response Time: ≤ 1 ms (On ↔ Off)
• Isolation Method: Photo-coupler isolation
• Surge Absorber: Zener diode
• Common Method: 32 points / 1 COM
• Current Consumption: 130 mA (all points ON)
• External Voltage: DC 12/24 V ±10%, ripple ≤ 4 Vp-p
• Connection: 40-pin connector
• Cable Size: 0.3 mm²
• Dimensions (W × H × D): 170 × 98 × 19 mm
• Weight: 0.26 kg
• Operating Temperature: 0°C to +55°C
• Storage Temperature: −25°C to +70°C
• Humidity: 5% to 95% RH (non-condensing)
• Certifications: CE

Typical Applications

• Discrete control of relays, contactors, and solenoid valves
• LED indicator and alarm horn driving
• SSR (solid-state relay) control in heating systems
• High-speed interlock and sequencing logic
• Compact control cabinets requiring high-density I/O

FAQ

Q: What type of outputs does the 2MLQ-TR4B provide?
A: It provides 32 source-type transistor outputs for DC 12/24 V loads.

Q: What is the maximum current per point?
A: 0.1 A per point, with a maximum of 2 A per common (COM).

Q: What connector is required for field wiring?
A: A standard 40-pin connector is required. Pre-assembled cable assemblies with remote terminal blocks are recommended for simplified field termination.

Q: Does the module support hot-swapping?
A: No. Rack power must be fully isolated and switched off before inserting or removing any I/O module to prevent backplane damage.

Q: Is there surge protection?
A: Yes, each output features an integrated Zener diode surge absorber compliant with IEC 61000-6-2.

Installation Guide

1. Power Off: De-energize the entire MasterLogic-200 rack before installing the 2MLQ-TR4B.
2. Slot Insertion: Align the module with the guide rails and press firmly into the selected I/O slot until the retention clips lock.
3. Connector Wiring: Attach the 40-pin connector to the module front. Use 0.3 mm² stranded wire for field connections. Group loads by common to respect the 2 A per COM limit.
4. External Power: Supply DC 12/24 V to the module's external power terminals. Verify ripple is ≤ 4 Vp-p.
5. Load Verification: Ensure each load does not exceed 0.1 A continuous. For inductive loads, add external flyback diodes.
6. Status Check: Power on the rack and confirm LED indicators illuminate correctly when outputs are activated via the PLC program.

Selection Tips

• Choose the 2MLQ-TR4B for high-density DC output applications requiring fast transistor switching.
• If you need relay outputs for AC loads or higher current capacity, consider the 2MLQ-RY2A or 2MLQ-RY2B relay output modules.
• For sink-type transistor outputs, verify availability of the complementary model in your region.
• Respect the 2 A per COM limit — distribute high-current loads across multiple commons or modules.
• Account for inrush current (4 A for 10 ms) when driving capacitive or lamp loads.