# AutomationDirect BX-DM1-18ED2

Hardware · `BX-DM1-18ED2` · verification: source checked

The BX-DM1-18ED2 is a BRX Do-more stackable micro brick PLC from AutomationDirect. It provides 10 discrete inputs and 8 sourcing discrete outputs, a RS-232/RS-485 serial port, microSD card slot, battery backup, and expansion for up to eight modules. It is programmed in ladder with Do-more Designer software v2.0 or later and requires 120-240 VAC external power.

## Specification

| Property | Value |
|---|---|
| Category | plc |
| Weight | 0.408233133 kg |
| Program memory | 64000 words |
| Data memory | 128000 words |
| Discrete inputs | 10 |
| Discrete outputs | 8 |
| Serial ports | 1 |
| Motion axes | 4 |
| 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

- Agency approvals: UL Listed File # E185989, CE marked, and RoHS compliant. UL Recognized, UL Hazardous and CSA files are listed as none.
- Contains a button-cell lithium battery (CR2032; replacement D0-MC-BAT); dangerous goods classification UN3091, lithium content 0.07.

## Study notes

- Total memory is 192k words, split into 64k words ladder memory and 128k words user data memory.
- Programming uses ladder language and Do-more Designer software v2.0 or later.
- Serial port is RS-232/RS-485 on a 3-pin terminal, up to 115.2k baud; supported port protocols include Do-more protocol, Modbus RTU master/slave, ASCII in/out, K-sequence slave, and a non-secure HTTP webserver.
- Supports up to 8 expansion modules; has real-time clock/calendar, retentive memory, battery backup and a microSD card slot.
- Discrete inputs accept 12-24 VAC/VDC and are sinking/sourcing; discrete outputs are 12-24 VDC sourcing at 0.5 A per point.
- Supports up to 4 virtual axes, PTO pulse/direction or CW/CCW outputs, PWM outputs, and motion profiles including trapezoid, S-curve, electronic gearing, camming and linear interpolation.
- 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.
- Maximum switching frequency is 250 kHz; supports 100+ PID loops configurable to memory limit.

## Sources

1. [BRX Do-more PLC: 10-pt in, 8-pt out, serial port, (programmable logic controller) (PN# BX-DM1-18ED2) | AutomationDirect](https://www.automationdirect.com/adc/shopping/catalog/programmable_controllers/brx_plcs_(stackable_micro_brick)/plcs_-a-_cpus/bx-dm1-18ed2) (accessed 2026-10-26)
2. [BX DM1 18ED2 cutsheet](https://cdn.automationdirect.com/static/specs/cutsheet/BX-DM1-18ED2_cutsheet.pdf) (accessed 2026-10-26)

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