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- Honeywell
- 2MLQ-TR8B
- Digital Output Module
- USA
- 114 × 48 × 127 mm
- 0.15 kg
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Product Overview
The Honeywell 2MLQ-TR8B is a 64-point transistor output module for the MasterLogic-200 PLC system. It uses a sourcing (PNP) output configuration to control external DC loads, including solenoid valves, indicator circuits, auxiliary control devices, and other compatible field equipment.
Its 64-channel configuration makes the module suitable for production machinery with a large number of discrete output signals. Instead of distributing these signals across several lower-density modules, the TR8B can handle up to 64 output points in one I/O position.
One important selection consideration is its sourcing output arrangement. When a channel switches ON, the module supplies positive voltage to the connected load. This differs from the sinking (NPN) configuration used by the 2MLQ-TR8A. Although both models have 64 output points, their field wiring arrangements are different.
The module supports DC 12 V and DC 24 V loads, with a maximum output current of 0.1 A per point and 2 A per common connection. Its semiconductor switching architecture is suitable for repetitive switching operations involving compatible low-current DC devices.
In an automated assembly line, for example, the TR8B can operate multiple pneumatic valve circuits, machine indicators, and auxiliary control signals. The PLC determines the required output states according to sensor feedback and programmed sequences, while the module handles the physical switching of the connected loads.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | 2MLQ-TR8B |
| Product Type | 64-Point Transistor Output Module |
| Product Series | MasterLogic-200 |
| Output Type | Transistor Output (Source Type / PNP) |
| Output Points | 64 |
| Isolation Method | Photo Coupler Isolation |
| Rated Load Voltage | DC 12/24 V |
| Load Voltage Range | DC 10.2–26.4 V |
| Maximum Load Current | 0.1 A / Point, 2 A / COM |
| Off-State Leakage Current | 0.1 mA or less |
| Maximum Inrush Current | 4 A / 10 ms or less |
| Maximum ON-State Voltage Drop | DC 0.3 V or less |
| Surge Absorber | Zener Diode |
| OFF-to-ON Response Time | 1 ms or less |
| ON-to-OFF Response Time | 1 ms or less (rated resistive load) |
| Common Configuration | 32 Points / 1 COM |
| Current Consumption | 230 mA (all points ON) |
| External Power Supply | DC 12/24 V ±10% |
| Maximum Ripple Voltage | 4 Vp-p |
| External Power Supply Current | 10 mA or less (DC 24 V connection) |
| Operation Indicator | Output ON LED |
| External Connection | Two 40-Pin Connectors |
| Recommended Cable Size | 0.3 mm² |
| Dimensions | 114 × 48 × 127 mm |
| Weight | 0.15 kg |
Product Features
· 64-Point Transistor Output
The TR8B provides 64 independent digital output channels for controlling external DC devices. This channel density is useful in production equipment with numerous pneumatic actuators, indicator circuits, and auxiliary switching signals.
· Sourcing PNP Output Configuration
The module uses PNP transistor switching. When an output is activated, the corresponding channel supplies positive voltage to the connected load. The field wiring must follow the sourcing-output arrangement.
· DC 12/24 V Load Compatibility
The module supports rated DC 12 V and DC 24 V loads, with an allowable load voltage range of DC 10.2–26.4 V. This covers common industrial DC control circuits.
· Photo Coupler Isolation
Photo coupler isolation separates the output control signals from the internal control circuitry. This provides electrical separation between the PLC-side electronics and the external output circuits.
· Fast Switching Response
The specified OFF-to-ON response time is 1 ms or less. The ON-to-OFF response time is also 1 ms or less under rated resistive-load conditions. These characteristics are useful in repetitive machine sequences.
· Defined Channel and Common Current Limits
Each output point supports a maximum load current of 0.1 A, while each COM supports up to 2 A. The 32-point-per-COM arrangement must be considered when distributing field loads.
· Integrated Zener Diode Surge Absorber
The output circuit incorporates a Zener diode surge absorber to help suppress switching-related voltage transients. The electrical characteristics of connected inductive loads should still be checked.
· Dual 40-Pin External Connections
Two 40-pin connectors provide the external wiring interfaces for the module’s 64 output points. This arrangement accommodates the higher channel count and helps organize field connections.
· LED Output Indication
LED indicators show output switching activity, allowing technicians to check active channels during commissioning and routine troubleshooting.
Working Principle
The 2MLQ-TR8B receives digital output commands from the MasterLogic-200 CPU and converts them into transistor switching signals for external DC loads.
Its sourcing configuration uses PNP transistor switching. In a typical circuit, the connected load is wired between the module output and the negative DC return. When the PLC activates an output point, the corresponding transistor conducts and supplies positive voltage to the load.
When the PLC removes the output command, the transistor switches OFF and interrupts the current supplied to the connected device.
Photo coupler isolation separates the internal control signal from the output-side switching circuitry. This allows the module to interface PLC logic with external DC equipment through its specified electrical isolation arrangement.
Typical Output Switching Sequence:
- Field sensors send operating information to the MasterLogic-200 CPU.
- The CPU evaluates the application program and determines the required output states.
- Output commands are transferred to the 2MLQ-TR8B.
- The corresponding PNP transistor channels switch ON.
- Positive DC voltage is supplied to the connected field loads.
- The external devices operate according to the programmed sequence.
- When the PLC removes the commands, the transistor channels switch OFF.
Example: Distributed Pneumatic Control
Consider an automated assembly line containing several pneumatic stations. Each station has solenoid valves for clamping, positioning, and releasing workpieces.
The TR8B can control compatible PNP-wired valve circuits across these stations. When the PLC receives confirmation from a position sensor, it activates the assigned output channel. The transistor supplies positive voltage to the valve coil, initiating the pneumatic movement.
After the programmed operation is completed, the CPU removes the output command and the channel switches OFF. The same process can be repeated across the remaining output points.
Role in MasterLogic-200 Control Architecture
Within the MasterLogic-200 architecture, the 2MLQ-TR8B serves as a high-density digital output interface between the PLC controller and external DC equipment.
The CPU handles application logic, sequence execution, and interlock decisions. The TR8B performs the corresponding transistor switching operations according to the output commands received from the controller.
Its 64-point configuration is useful when output signals are distributed across multiple machine sections. The two external connectors provide the field wiring interfaces, while the 32-point-per-COM arrangement allows the output circuits to be divided into two common groups.
The sourcing configuration is particularly relevant when the field devices and control wiring are based on PNP switching. For applications using NPN sinking outputs, the corresponding 2MLQ-TR8A should be evaluated instead.
| Control System Component | Function |
|---|---|
| 2MLQ-TR8B | 64-point sourcing transistor output |
| 2MLQ-TR8A | 64-point sinking transistor output |
| 2MLQ-TR4B | 32-point sourcing transistor output |
| 2MLQ-TR4A | 32-point sinking transistor output |
| 2MLQ-TR2B | 16-point sourcing transistor output |
| 2MLQ-TR2A | 16-point sinking transistor output |
| 2MLQ-RY1A | 8-point relay output |
| 2MLQ-RY2A | 16-point relay output |
| 2MLQ-RY2B | 16-point relay output with varistor |
| 2MLI-D28B | 64-point digital input module |
| 2MLI-D24B | 32-point digital input module |
| 2MLI-CPUH | High Performance CPU Module |
| 2MLI-CPUS | Standard CPU Module |
| 2MLP-ACF1 | AC Power Supply Module |
| 2MLP-DC42 | DC Power Supply Module |
| 2MLB-M06A | Main CPU Base |
| 2MLB-E08A | Expansion I/O Base |
Industrial Applications
| Application | Output Control Function |
|---|---|
| Automotive Production Lines | Controls distributed machine actuators and auxiliary DC devices |
| Packaging Machinery | Operates compatible pneumatic valves and machine indicators |
| Automated Assembly Equipment | Coordinates multiple discrete actuator circuits |
| Conveyor Systems | Controls equipment interfaces and auxiliary switching signals |
| Material Handling | Operates compatible PNP-controlled field devices |
| Pneumatic Automation | Activates valve coils for clamping and positioning |
| Industrial Sorting Systems | Controls pneumatic diverters and sorting mechanisms |
| Machine Tool Automation | Switches auxiliary functions and programmed interlocks |
| Automated Inspection Equipment | Activates external devices according to inspection results |
Installation and Maintenance
- Verify Output Configuration: Confirm that the installed module is the 2MLQ-TR8B with sourcing PNP outputs rather than the sinking-output 2MLQ-TR8A.
- Check Load Voltage: Ensure that connected devices operate within the specified DC 10.2–26.4 V load voltage range.
- Confirm Output Polarity: Verify that the external load circuit is compatible with positive-side PNP switching.
- Observe Individual Current Limits: Keep each output channel within the maximum load current of 0.1 A.
- Check Common Current Distribution: Ensure that the combined load current for each COM does not exceed 2 A.
- Inspect Both Connectors: Check the two 40-pin connectors for secure engagement, damaged contacts, and correct cable routing.
- Use Appropriate Wiring: Follow the recommended 0.3 mm² cable specification when preparing external connections.
- Check External Power Quality: Verify that the DC 12/24 V supply meets the specified voltage tolerance and ripple requirements.
- Review Inductive Loads: Check the inrush current and switching characteristics of solenoid valves and relay coils before connecting them.
- Monitor Output Indicators: Observe the LED indications during commissioning to identify active channels and assist with fault diagnosis.
- Investigate Channel Faults: If an output fails to operate, inspect the PLC command, external supply, wiring, connected load, and common connections.
- Maintain Channel Records: Keep an updated wiring schedule showing all 64 output addresses, connected devices, supply voltage, and COM group assignments.
Compatible System Components
| Component | Product Type | Application |
|---|---|---|
| 2MLQ-TR8A | 64-Point Transistor Output Module (Sink) | Alternative NPN output configuration |
| 2MLQ-TR4B | 32-Point Transistor Output Module (Source) | Lower-density PNP output applications |
| 2MLQ-TR4A | 32-Point Transistor Output Module (Sink) | Lower-density NPN output applications |
| 2MLQ-TR2B | 16-Point Transistor Output Module (Source) | 16-point PNP output control |
| 2MLQ-TR2A | 16-Point Transistor Output Module (Sink) | 16-point NPN output control |
| 2MLQ-RY2A | 16-Point Relay Output Module | Switching applications requiring relay contacts |
| 2MLQ-RY2B | 16-Point Relay Output Module with Varistor | Relay switching with integrated surge suppression |
| 2MLI-D28B | 64-Point Digital Input Module | Receives discrete field signals |
| 2MLI-D24B | 32-Point Digital Input Module | Receives machine status and sensor signals |
| 2MLI-CPUH | High Performance CPU Module | Executes PLC application logic |
| 2MLI-CPUS | Standard CPU Module | Standard PLC processing |
| 2MLP-ACF1 | AC Power Supply Module | Supplies PLC operating power |
| 2MLP-DC42 | DC Power Supply Module | Supplies PLC operating power |
| 2MLB-M06A | Main CPU Base | Houses CPU and associated modules |
| 2MLB-E08A | Expansion I/O Base | Supports additional I/O modules |
Recommended Related Models
| Model | Product Description |
|---|---|
| 2MLQ-TR8A | MasterLogic-200 64-Point Transistor Output Module (Sink Type) |
| 2MLQ-TR4B | MasterLogic-200 32-Point Transistor Output Module (Source Type) |
| 2MLQ-TR4A | MasterLogic-200 32-Point Transistor Output Module (Sink Type) |
| 2MLQ-TR2B | MasterLogic-200 16-Point Transistor Output Module (Source Type) |
| 2MLQ-RY2A | MasterLogic-200 16-Point Relay Output Module |
| 2MLI-D28B | MasterLogic-200 64-Point Digital Input Module |
Key Advantages
- 64 transistor output points in one module.
- Sourcing (PNP) output configuration.
- Supports DC 12 V and DC 24 V loads.
- Maximum load current of 0.1 A per point.
- Maximum common current of 2 A per COM.
- Photo coupler isolation.
- OFF-to-ON response time of 1 ms or less.
- ON-to-OFF response time of 1 ms or less under rated resistive-load conditions.
- Integrated Zener diode surge absorber.
- Two 40-pin external connectors.
- LED output operation indication.
- Integration with the MasterLogic-200 PLC architecture.
Technical FAQs
What is the difference between the 2MLQ-TR8B and the 2MLQ-TR8A?
Both modules provide 64 transistor output points, but their electrical switching arrangements are different. The TR8B uses sourcing PNP outputs, while the TR8A uses sinking NPN outputs. The correct selection depends on the external load wiring and field device configuration.
How should the 64 output points be distributed across the common terminals?
The TR8B uses a 32-point-per-COM arrangement. Each COM supports a maximum combined current of 2 A. During wiring design, loads should be distributed so that neither common group exceeds its current limit.
Can the 2MLQ-TR8B directly operate a DC 24 V solenoid valve?
It can operate a compatible DC 24 V solenoid valve if the coil current does not exceed 0.1 A per point and the relevant COM current remains within 2 A. The coil’s inrush current and inductive characteristics should also be checked.
Why does the TR8B use two 40-pin connectors?
The two connectors provide the external connection interfaces for the module’s 64 output points. They allow field wiring to be organized into separate connection groups and simplify the arrangement of multiple output circuits.