Allen Bradley 1753-L28BBBM

GuardPLC 1600 Safety Controller, 250 KB Max User Program Memory, 1x 9-Pin D-Shell RS-485 Modbus RTU Slave Port, 1x 9-Pin D-Shell RS-485 GuardPLC ASCII Protocol Port, 20 Safety-Related Digital Inputs 24V DC, 8 Digital Outputs 18.4V-26.8V (not electrically isolated), 24V DC Power