Specifications sourced from Prolon datasheet PL-DATA-M2000BLR-C/F-EN, REV 7.3.0. Verified September 18, 2026.
Overview
The M2000 BLR is a stand-alone or networked boiler plant controller built on Prolon's M2000 hardware platform. It drives boiler staging, pump control, and supply water temperature reset through 5 triac outputs and 3 analog outputs, with every input individually configurable for thermistor, dry contact, 4-20mA, or 0-5 VDC signals. Control sequences are set locally or remotely with the free Prolon Focus software, and the controller runs its own internal clock, schedules, and calendars whether or not a supervisor is present.
Best For
- Multi-boiler plants staging up to 4 boilers, a single multistage boiler, or a combination
- Systems that need outdoor-air reset of the supply water setpoint
- Plants with duty rotation requirements on pumps and boilers
- Retrofits that need a Modbus RTU boiler controller on an existing RS485 trunk
Warranty and Sourcing
Key Features
Up to 4 boiler stages
Stages multiple boilers, a single multistage boiler, or a combination of both.
2 modulating boilers
Controls up to 2 modulating boilers with an optional backup stage.
Outdoor reset
Resets the supply water setpoint from outside air temperature.
Lead-lag rotation
Multiple lead-lag sequences are available for both the pumps and the boilers.
Dedicated contact inputs
One input requests the maximum heat setpoint on contact closure; a second deactivates all boilers on contact closure.
Pump exercise
A configurable pump exercise sequence runs pumps through extended periods of inactivity.
- Pump activity based on outside temperature or call for heat (or both)
- Optional control sequence for a three-way valve
- Offset the supply water setpoint from a network received demand or occupancy
- Internal clock with configurable schedules and calendars
- A manual/off/auto switch for each of the eight outputs
- Proportional integral (PI) control loops
- 5 digital outputs and 3 analog outputs equipped with resettable fuses
- Built-in protection sequences with configurable temperature limits and minimum delays
Technical Specifications
| Specification | PL-M2000-BLR |
|---|---|
| Supply | 24 VAC +/-10%, 50/60 Hz, Class 2 |
| Power | 5 VA (consumption), 40 VA (input) |
| Inputs | 7 configurable analog inputs (outside temp / supply temp / return temp / dry contacts for proof of pumps, max heat request and boiler disable). Input signals (thermistor / dry contact / 4-20mA / 0-5 VDC) individually configurable for each input |
| Digital Outputs | 5 triac outputs, 10-30 VAC source, 300 mA max (resettable fuse) |
| Analog Outputs | 3 x 0-10 VDC outputs, 40 mA max (resettable fuse) |
| Indication Lights (LED) | State of each output / Communication / Power / State of microprocessor |
| Microprocessor | PIC18F6722, 8 bits, 40 MHz, 128 KB FLASH memory |
| Casing | Molded ABS, UL94-HB |
| Communication | Modbus RTU (RS485), up to 127 nodes |
| Baud Rates | 9600, 19200, 38400, 57600, 76800, 115200 |
| Connection | Removable screw-type terminal blocks (max 16 AWG) and RJ45 modular jacks |
| Dimensions | 5.39 in x 4.41 in x 2.25 in (137 mm x 112 mm x 57 mm) |
| Weight | 1.05 lbs (0.48 kg) |
| Environment | -4 to 122 °F (-20 to 50 °C) Non-Condensing |
| Certification | UL916 Energy Management Equipment, CAN/CSA-C22.2, RoHS, FCC part 15: 2012 class B |
Documentation
Frequently Asked Questions
How many boiler stages can the PL-M2000-BLR control?
Up to 4 boiler stages. That can be multiple boilers, a single multistage boiler, or a combination of the two. The controller can also modulate up to 2 boilers with an optional backup stage.
How many inputs does the PL-M2000-BLR have?
7 configurable analog inputs. They cover outside temp, supply temp, return temp, and dry contacts for proof of pumps, max heat request, and boiler disable. Each input is individually configurable for thermistor, dry contact, 4-20mA, or 0-5 VDC.
What outputs does the PL-M2000-BLR provide?
5 triac digital outputs rated 10-30 VAC source, 300 mA max with a resettable fuse, plus 3 analog outputs at 0-10 VDC, 40 mA max with a resettable fuse. Each of the eight outputs has a manual/off/auto switch.
Can the PL-M2000-BLR run without a network?
Yes. It operates stand-alone or networked over Modbus RTU (RS485) with up to 127 nodes. The internal clock, schedules, and calendars run on board.
What supply power does the PL-M2000-BLR need?
24 VAC +/-10%, 50/60 Hz, Class 2. Consumption is 5 VA, with 40 VA input.
- Controller Type:
- Boiler
- Digital Outputs:
- 5
- Analog Outputs:
- 3
- Inputs:
- 7
- Communication:
- Modbus RTU (RS485)
- Product Series:
- M2000
