Product Summary
The 1747-L553 SLC 5/05 processor provides high memory and fast scan times for demanding control. This CPU supports 4096 inputs and outputs with battery-backed RAM. It integrates Ethernet and RS-232 for versatile communication in factory automation.
Theme A: Product Procurement & Buyer Guide
This processor solves key industrial pain points for procurement managers. The 1747-L553 offers the highest memory in the SLC 5/05 series with 64,000 words of user memory. This capacity handles complex control techniques without requiring a larger platform. The module executes a program scan in 0.9 ms/K and an I/O scan in 0.225 milliseconds. These speeds ensure rapid logic execution for time-sensitive applications.

The module controls up to 4096 discrete inputs and outputs. It also manages 480 analog I/O points for process loops. This flexibility suits medium to large scale applications. The integrated Ethernet port communicates over long distances at 10/100 Mbps. This feature allows connection to multiple devices simultaneously. The RS-232 port provides direct peer-to-peer access to an HMI or workstation.
Buyers save costs by using this single CPU for diverse tasks. The 1747-L553 supports Remote I/O and DeviceNet scanner modules. This capability distributes I/O across a plant floor for SCADA systems. The processor occupies slot zero in any SLC 500 chassis. This fixed assignment simplifies system design and inventory management.
Theme D: Expert Technical Evaluation & Performance Review
The 1747-L553 delivers precise performance for critical control loops. The bit-instruction execution time is 0.37 milliseconds. This speed supports fast relay logic and sequencing. The CPU uses battery-backed RAM powered by the 1747-BA battery. It also accepts a 1747-M13 memory module for 64 KB backup. This redundancy protects programs during power loss.

The processor operates in clean, dry environments from 0 to 60 degrees Celsius. It withstands a 30G operating shock for industrial durability. The backplane draws 1 Amp at 5 Volts DC only. This low current reduces heat generation in the chassis. The Ethernet port runs three times faster than older DH-485 ports. This speed improves data transfer for supervisory control.
The 1747-L553 contains a PLC-5 based advanced instruction set. It supports online programming and floating-point math. A built-in real-time clock and calendar timestamp events. These features enable precise data logging and trend analysis. Engineers can send messages to ControlLogix and CompactLogix platforms. This capability integrates the SLC 500 into a modern networked plant.
Logistics & Standard Packaging Details


