**HONEYWELL 2MLQ-TR2B Product Description** Overview **HONEYWELL 2MLQ-TR2B** is a **MasterLogic-200 16-point transistor output module** for the Honeywell MasterLogic PLC platform. The module provides digital sourcing transistor outputs for controlling compatible DC loads in industrial automation control panels. It connects to the MasterLogic-200 PLC base or rack and exchanges output commands with the CPU through the internal PLC backplane. The **2MLQ-TR2B** is used as a replacement digital output spare in existing Honeywell MasterLogic-200 installations originally equipped with this output module. Features **HONEYWELL 2MLQ-TR2B** provides **16 digital transistor output points** in a **sourcing output** configuration. The load supply is nominal **12 / 24 V DC**, with a load voltage range of **10.2 to 26.4 V DC**. Each output point can carry a maximum load current of **0.5 A**, and maximum common current is **4 A per COM**. The common connection groups **16 points per 1 COM**. External load power is **12 / 24 V DC ±10 percent**. The module uses **opto-coupler isolation** between control and output circuits. Output response time is **1 ms or less** for both off-on and on-off transitions under the listed test conditions. Output circuits include zener diode overvoltage protection and common fuse protection. CPU or PLC detection and an LED indicate common fuse dropout, while each output has an individual on-state LED indicator. The module uses an **18-point terminal block connector** for field wiring. Specs Brand: **HONEYWELL** Product family: **MasterLogic-200** Model: **2MLQ-TR2B** Product type: Digital transistor output module Number of output points: **16** Output type: **Sourcing** transistor output Nominal load voltage: **12 / 24 V DC** Load voltage range: **10.2 to 26.4 V DC** Maximum load current per point: **0.5 A** Maximum common current: **4 A per COM** Common grouping: **16 points per 1 COM** External supply: **12 / 24 V DC ±10 percent** Isolation: Opto-coupler isolation Output response time: **1 ms or less** Overvoltage protection: Zener diode Fuse protection: Common fuse with dropout indication Indicators: Individual output LED; common fuse status indication Terminal connector: **18-point** terminal block Compatible platform: Honeywell **MasterLogic-200** PLC system Product status: Honeywell MasterLogic-200 replacement digital output module spare Principle **HONEYWELL 2MLQ-TR2B** receives output state commands from the PLC CPU over the MasterLogic backplane. Opto-couplers isolate the PLC control electronics from the field output circuits while passing the output command to the transistor stage. Each sourcing transistor switches the external DC load supply to its connected load when the output is commanded on, allowing current to flow through solenoid valves, DC relays, contactor interface circuits, motor interface circuits, indicators or other DC digital loads. The common fuse protects the grouped output circuit, and the common current must remain within the **4 A per COM** limit to avoid overheating or module damage. Zener protection helps suppress switching transients on inductive loads. Individual LEDs show commanded output state, while fuse dropout indication supports cabinet diagnostics. During replacement, the PLC hardware configuration, output address assignment, COM grouping, external DC supply, polarity, terminal wiring and connected load ratings must match the original MasterLogic-200 installation. Applications **HONEYWELL 2MLQ-TR2B** is used for solenoid valve control, DC relay control, contactor interface circuits, motor control interface circuits, machine automation, production equipment, industrial sequencing, alarm and indicator control, actuator control and general DC digital output applications. It fits MasterLogic-200 control panels in process equipment, production lines, packaging machines, material handling, pumps and fans, compressors, conveyors, utilities, water and wastewater, chemical and process plants, and general industrial automation. In existing MasterLogic-200 installations, the module serves as a direct replacement digital output spare matched to the original rack position, terminal wiring, COM grouping and PLC configuration.