Purchase now: Allen Bradley 1747-L552 SLC 5/05 Processor
Purchase now: Atlantechdrives provides you the 1747-L552, a highly capable, mid-to-high tier CPU processor belonging to the Allen Bradley SLC 5/05 family. Designed for complex, data-heavy automation systems, the 1747-L552 features an expanded 32,000 words (32K) of user memory. This memory overhead is crucial for facilities implementing advanced recipe management, extensive integer scaling, and multiple closed-loop PID controls. Furthermore, its native 10/100 Mbps Ethernet port allows the 1747-L552 to effortlessly communicate with modern HMIs, specialized variable frequency drives, and even newer ControlLogix PACs across the plant floor. It is the processor of choice for water/wastewater plants and large material handling lines transitioning to modern Ethernet architectures.
Technical Specifications of the 1747-L552
The 1747-L552 offers superior processing speed for both discrete bit execution and complex floating-point mathematics. It allows for seamless peer-to-peer messaging across standard local area networks.
- Part Number: 1747-L552
- Processor Class: SLC 5/05 CPU
- Total User Memory: 32K Words (Instructions and Data)
- Channel 1 Port: Ethernet/IP (RJ45, 10/100 Base-T)
- Channel 0 Port: RS-232 (Supports DF1 Full/Half Duplex, ASCII)
- Instruction Set: Full suite (PID, Real Math, ASCII, String, MSG)
- Maximum Local I/O Capacity: 4096 inputs / 4096 outputs
- Backplane Current Draw: 1.0 Amps at 5V DC
Expert Tips: Managing Ethernet MSG Instructions
When you have 32K of memory, it’s tempting to set up massive peer-to-peer communication networks. Expert Tip: The SLC 5/05 uses the MSG (Message) instruction in ladder logic to read or write data to other PLCs over Ethernet. However, a common mistake is placing a MSG block on an unconditional rung, causing the processor to fire the message every single scan cycle (every few milliseconds). This will rapidly saturate the Ethernet network bandwidth and instantly overflow the 5/05’s internal communication buffers, throwing an error code and dropping the connection. You must use cascading timers or the message instruction’s «Enable» (.EN) and «Done» (.DN) control bits to sequence your messages logically, ensuring one message completes before the next is fired.
Maintenance and Firmware Revisions
The 1747-L552 has been manufactured through various firmware and hardware revisions over the decades (e.g., Series A, B, and C). If you are replacing a failed unit, pay close attention to the Series and Firmware OS number printed on the side label. Older Series A hardware only supported 10 Mbps Ethernet (10 Base-T) and had lower connection limits. Series C hardware supports 10/100 Mbps auto-negotiation and features significantly expanded Ethernet connection buffers. To utilize the latest features, ensure your RSLogix 500 software is updated to match the newer firmware OS.
Frequently Asked Questions (FAQs)
Q: Can the 1747-L552 communicate with a modern ControlLogix or CompactLogix processor?
A: Yes. Because they both support the Ethernet/IP protocol, you can use MSG instructions to map data between the legacy SLC integer files (e.g., N7:0) and the modern tag-based arrays in the Logix 5000 environment.
Q: How do I back up my 32K program?
A: You should install a 1747-M13 (64K EEPROM) memory module into the motherboard socket. Using RSLogix 500, burn the program to the EEPROM to ensure your logic is protected in the event of a dead battery.
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This 32KB SLC 5/05 controller provides high-speed data exchange via Ethernet when powered by a 1746-P2 supply.
