# AutomationDirect BX-DM1-36ER

Hardware · `BX-DM1-36ER` · verification: source checked

The BX-DM1-36ER is a BRX Do-more stackable micro brick programmable logic controller from AutomationDirect. It provides 20 discrete input points (12-24 VAC/VDC, sinking/sourcing) and 16 relay output points, plus an RS-232/RS-485 serial port for programming and communications. It is powered from 120-240 VAC, stores programs in ladder logic, and accepts up to eight expansion modules.

## Specification

| Property | Value |
|---|---|
| Category | plc |
| Weight | 0.635 kg |
| Program memory | 64000 words |
| Data memory | 128000 words |
| Discrete inputs | 20 |
| Discrete outputs | 16 |
| Serial ports | 1 |
| Supply voltage | 120-240 VAC |

## Connected

- Manufacturer: [AutomationDirect](https://machineschema.com/manufacturer/automationdirect.md)
- Protocols: [MODBUS RTU](https://machineschema.com/protocol/modbus-rtu.md)

## Safety

- UL Listed, file # E185989; no UL Recognized or UL Hazardous file.
- CE declaration available and RoHS status: Yes.
- Ships with a lithium button cell battery installed (UN3091, packaging instruction 970, lithium content 0.07); replacement battery D0-MC-BAT (CR2032).

## Study notes

- Total memory is 192k words, split into 64k words of ladder memory and 128k words of user data memory.
- Programs are written in ladder using Do-more Designer programming software v2.0 or later.
- Retentive memory, a real-time clock/calendar and battery backup are included; a MicroSD card slot is provided for removable media.
- Serial port is a single RS-232/RS-485 3-pin terminal supporting Do-more protocol, Modbus RTU master/slave, ASCII in/out, K-sequence slave, a non-secure HTTP webserver, and programming/monitoring, at speeds up to 115.2k baud.
- Up to 8 expansion modules can be added.
- 10 of the discrete inputs are high-speed capable; frequency response is 250 kHz. High-speed counters are configurable as up to (3) up, (3) down, (3) up/down, (3) pulse/direction, (3) quadrature (A and B) or (3) quadrature (A and B with Z) counters.
- Inputs are arranged in 5 isolated commons of 4 points each; outputs in 4 isolated commons of 4 points each.
- Outputs are 16 Form A (SPST) relays rated 2 A per point, with a nominal output voltage of 12-48 VDC / 24-240 VAC.
- Up to 100+ PID loops, configurable to the memory limit.
- Interrupts: up to (4) input interrupts, (4) timer interrupts and (4) match register interrupts.
- The unit ships with a BX-RTB03S terminal block and D0-MC-BAT battery, and requires a BX-RTB36 or BX-RTB36-1 terminal block kit or ZIPLink pre-wired cables.

## Sources

1. [BRX Do-more PLC: 20-pt in, 16-pt out, serial port, (programmable logic controller) (PN# BX-DM1-36ER) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/brx_plcs_(stackable_micro_brick)/plcs_-a-_cpus/bx-dm1-36er) (accessed 2026-10-26)
2. [BX DM1 36ER cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/BX-DM1-36ER_cutsheet.pdf) (accessed 2026-10-26)

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