This module, the 1747-L553, is a part of the Allen Bradley SLC 500 series that has a number of useful applications such as HAVC control, small process controller and material handling. It has a process based on a PLC-5 and comes with a set of advanced instructions for user comprehensibility. This unit can either be set throughout the entire system for SCADA applications, or it can remain on its own. It can hold up to 64,000 words in total; 60,000 words may be used for data or program information, and 4,000 can be used for data alone. It also contains up to 480 analog I/O, with 4096 inputs and outputs. Still, its program scan time is 0.9 milliseconds per word, with an I/O scan time of 0.225 milliseconds.

The backplane current of the 1747-L553 is 5 Volts of DC (Direct Current) at 1 A, and 24 Volts DC at 0 A (175 mA). This unit has 3 local I/O chassis with 30 module slots for the local I/O chassis. It has both Ethernet and RS-2332 communication ports, configured for network communications, and it is connected to a 1761-NET-AIC converter. This processor has a built in real-time clock, a built-in calendar, and a key-switch, in addition to its Series features of flash memory upgrades, online programming, and floating-point math. It supports RSLogix 500 software for programming and contains a flash backup memory and a standard battery-backed RAM.

While operating, this unit can withstand a 30 g operating shock, and should be operated only in an environment that is compliant with the 0 to 60-degree Celsius temperature standard.