# AutomationDirect BX-DM1-18ER

Hardware · `BX-DM1-18ER` · verification: source checked

The BX-DM1-18ER is a BRX Do-more programmable logic controller from AutomationDirect. It provides 10 discrete inputs and 8 relay outputs, one RS-232/RS-485 serial port, a microSD card slot, and battery-backed retentive memory. It is powered by 120-240 VAC and supports up to eight expansion modules.

## Specification

| Property | Value |
|---|---|
| Category | plc |
| Weight | 0.4309127515 kg |
| Program memory | 64000 words |
| Data memory | 128000 words |
| Discrete inputs | 10 |
| Discrete outputs | 8 |
| 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; UL Recognized and UL Hazardous listings are None; CSA file is None.
- Contains an installed button lithium battery classified UN3091 with lithium content 0.07; replacement is D0-MC-BAT (CR2032).
- CE declaration and RoHS compliance are stated; EU REACH document is referenced.

## Study notes

- Total memory is 192k words: 64k words ladder memory and 128k words user data memory.
- The communication port is one RS-232/RS-485 3-pin terminal with speeds up to 115.2k baud.
- Port protocols include Do-more protocol, Modbus RTU master/slave, ASCII in/out, K-sequence slave, and a non-secure HTTP webserver.
- Programming uses ladder language in Do-more Designer programming software v2.0 or later.
- Supports up to 8 expansion modules and up to 100+ PID loops configurable to the memory limit.
- All 10 discrete inputs are high-speed capable; up to 3 high-speed counters are supported.
- Relay outputs are Form A (SPST) with a load current of 2 A per point; nominal output voltage is 12-48 VDC/24-240 VAC.
- Includes BX-RTB03S terminal block and D0-MC-BAT battery; requires BX-RTB18 or BX-RTB18-1 terminal block kit or ZIPLink pre-wired cables.

## Sources

1. [BRX Do-more PLC: 10-pt in, 8-pt out, serial port, (programmable logic controller) (PN# BX-DM1-18ER) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/brx_plcs_(stackable_micro_brick)/plcs_-a-_cpus/bx-dm1-18er) (accessed 2026-10-26)
2. [BX DM1 18ER cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/BX-DM1-18ER_cutsheet.pdf) (accessed 2026-10-26)

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