AutomationDirect BX-DM1-18AR

The BX-DM1-18AR is a BRX Do-more stackable micro brick programmable logic controller. It provides 10 AC discrete inputs and 8 relay discrete outputs, one RS-232/RS-485 serial port, a microSD card slot and battery-backed retentive memory. It is programmed in ladder with Do-more Designer software version 2.0 or later and accepts up to eight expansion modules.

Source checked8/8 values · 2026-10-26

AutomationDirect PLC

Specification

2 sources

Category	plc
Program memory	64,000 words
Data memory	128,000 words
Discrete inputs	10
Discrete outputs	8
Serial ports	1
Supply voltage	120-240 VAC

Study notes

Total memory is 192k words, split into 64k words of ladder memory and 128k words of user data memory.
Serial port is RS-232/RS-485 on a 3-pin terminal, with port speeds up to 115.2k baud.
Supported port protocols: Do-more protocol, Modbus RTU master/slave, ASCII in/out, K-sequence slave, and a non-secure HTTP webserver for programming and monitoring.
Real-time clock/calendar, retentive memory and battery backup are all included.
Up to 8 expansion modules can be added; maximum number of PID loops is 100+ (configurable to memory limit).
Discrete inputs are 10 points at 120-240 VAC, arranged as 2 isolated commons of 5 points each.
Discrete outputs are 8 Form A (SPST) relays, arranged as 2 isolated commons of 4 points each, rated 2 A per point; nominal output voltage 12-48 VDC/24-240 VAC.
Requires a BX-RTB18 or BX-RTB18-1 terminal block kit or ZIPLink pre-wired connection cables.
Ships with a BX-RTB03S terminal block and a D0-MC-BAT battery.
Item shipping weight is stated as 0.95 lb; country of origin USA, HS code 8537.10.

Safety

UL Listed, file # E185989; no UL Recognized, UL Hazardous or CSA file number is stated.
RoHS status: Yes; CE declarations and EU REACH document are referenced.
A lithium button battery is installed (UN3091, lithium content 0.07, packaging instruction 970); replacement battery D0-MC-BAT, generic CR2032.
External power requirement is 120-240 VAC.