# AutomationDirect BX-DM1-18ED1

Hardware · `BX-DM1-18ED1` · verification: source checked

The BX-DM1-18ED1 is a BRX Do-more stackable micro brick programmable logic controller from AutomationDirect. It runs ladder logic programmed with Do-more Designer and provides 10 discrete inputs plus 8 sinking discrete outputs on the base unit, with a single RS-232/RS-485 serial port for programming, Modbus RTU and ASCII communication. It accepts up to 8 expansion modules, includes a real-time clock, retentive memory, battery backup and a microSD card slot, and is powered from 120-240 VAC.

## Specification

| Property | Value |
|---|---|
| Category | plc |
| Weight | 0.408 kg |
| Program memory | 64000 words |
| Data memory | 128000 words |
| Discrete inputs | 10 |
| Discrete outputs | 8 |
| Serial ports | 1 |
| Supply voltage | 120-240 VAC |
| Switching frequency | 250000 Hz |

## Connected

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

## Safety

- Agency approvals: UL Listed File # E185989; no UL Recognized file, no UL Hazardous file and no CSA file; RoHS status Yes (see CE document), with CE declarations and EU REACH document available.
- Ships with a button-cell lithium battery installed: UN3091, hazard type lithium batteries, lithium content 0.07, packaging instruction 970; replacement battery D0-MC-BAT (generic CR2032).
- External power requirement is 120-240 VAC.

## Study notes

- Memory totals 192k words: 64k words ladder program memory plus 128k words user data memory.
- Programming language is ladder, using Do-more Designer programming software v2.0 or later.
- Communication port is (1) RS-232/RS-485 on a 3-pin terminal, up to 115.2k baud; supported protocols are Do-more protocol, Modbus RTU master/slave, ASCII in/out, K-sequence slave and a non-secure HTTP webserver.
- 10 discrete inputs rated 12-24 VAC/VDC, sinking/sourcing, split across 2 isolated commons of 5 points each; frequency response 250 kHz.
- 8 sinking discrete outputs rated 12-24 VDC at 0.5 A/point, split across 2 isolated commons of 4 points each.
- All 10 inputs are high-speed capable and 4 outputs are high-speed capable; up to 3 up/down, pulse/direction or quadrature counters and up to 3 interval, duration or frequency measurement functions.
- Output pulse modes support up to 4 virtual axes, 3 PTO linear step/direction outputs, 2 PTO CW/CCW outputs, 2 PTO quadrature outputs and 3 PWM outputs.
- Axis profiles include relative/absolute positioning, velocity mode, trapezoid, S-curve, electronic gearing, camming, following, homing, jogging and linear interpolation.
- Up to 100+ PID loops, configurable to the memory limit; up to 4 input interrupts, 4 timer interrupts and 4 match register interrupts, plus up to 4 programmable limit switches and 4 preset tables.
- Two isolated input commons and two isolated output commons are provided; maximum of 8 expansion modules may be added.
- Includes BX-RTB03S terminal block and D0-MC-BAT battery; requires BX-RTB18 or BX-RTB18-1 terminal block kit or ZIPLink pre-wired connection cables.
- Supports real-time clock/calendar, retentive memory, battery backup and a MicroSD card slot.

## Sources

1. [BRX Do-more PLC: 10-pt in, 8-pt out, serial port, (programmable logic controller) (PN# BX-DM1-18ED1) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/brx_plcs_(stackable_micro_brick)/plcs_-a-_cpus/bx-dm1-18ed1) (accessed 2026-10-26)
2. [BX DM1 18ED1 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/BX-DM1-18ED1_cutsheet.pdf) (accessed 2026-10-26)

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