The D100 Micro Programmable Logic Controller series is a controller device series manufactured by Eaton Cutler-Hammer. These controllers are equipped with a central processing unit, power supply, memory module, and input/output circuitry for other terminals. These logic controllers are used to control counters, step sequences, flip-flop functions, 1-shot functions, master control functions, and timers. The D100 series controllers are available in a wide range of variants and they can be used to control a wide spectrum of applications. The logic controllers are compact in size and cost-effective. They have exceptional expansion abilities with 14 to 120 I/O. The D100 Micro Programmable Logic Controllers make use of true ladder logic programming. The controllers have the ability to display 8 runs of logic at a single time. The front of the controller is equipped with a large LCD screen.

The D100 Micro Programmable Logic Controllers are used to monitor the operation of the whole machine system. Timers and counter registers can also be observed in real-time. The logic controllers are equipped with analog input modules, protocol modules, multidrop modules, RS 232 converters, and timer/counter access modules. The logic controllers are manufactured in different configurations to meet different requirements. They are available with 115 Volts AC and 24 Volts DC power supplies. A maximum of 12 inputs are supported by different controller variants. The D100 Micro Programmable Logic Controllers come with different system I/O capacities, disk sizes, and power supply ratings. All of the controllers use a lithium-ion battery rated at 3 Volts with 1200 mA. The controllers can only be operated in a temperature range between 0 and 60 degrees Celsius. They can be mounted either vertically or horizontally. There should be enough space around the controllers so that they can be properly ventilated.