Description
Allen‑Bradley 1747-L543/C SLC 5/04 Processor – 32K CPU for DH+ and Serial-Based Control
The Allen‑Bradley 1747-L543/C is a solid choice when you need a dependable SLC 5/04 processor with 32K words of user memory and native DH+ networking. From my experience, this model fits best in plants that still rely on DH+ networks but want stable performance and easy maintenance. You get Channel 0 for RS-232 (DF1/DH‑485/ASCII) and Channel 1 for DH+, which makes it simple to connect legacy HMIs, drives, or bridge to newer systems through gateways. One thing I appreciate is the straightforward migration path: if your I/O is all 1746-based, you typically drop this in the left-most slot and you’re running with minimal wiring changes.
Our Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery: 1 week for in‑stock; no more than one month at the latest
- Payment: 50% advance payment, full payment before delivery
- Express options: FedEx, UPS, DHL
Key Features
- 32K word user memory – adequate space for medium‑sized control programs, data logging, and PID loops without hitting limits too quickly.
- Dual‑port communications – Channel 0: RS‑232 (DF1, DH‑485, ASCII) for programming and HMI; Channel 1: DH+ for plant‑wide peer communications.
- Stable Series C hardware – this revision is known for reliable DH+ performance and broad compatibility with 1746 I/O.
- Online edits and diagnostics – minimize downtime by adjusting logic while running and using onboard status LEDs for quick troubleshooting.
- Battery‑backed RAM – retains program and data on power loss; replaceable lithium battery for predictable maintenance.
- Seamless 1746 ecosystem – works with digital, analog, and specialty SLC I/O in local or remote chassis, which reduces migration costs.
- Flexible DH+ rates – typically 57.6/115.2 kbps; in many cases, later firmware enables 230.4 kbps for higher throughput.
“We dropped a 1747-L543/C into an existing 7‑slot chassis to replace a failing 5/03. Keeping DH+ for our PanelView cut the changeover time to a Saturday shift. No code rewrite, just a tidy comms reconfiguration.” — Maintenance Supervisor, food packaging line
Technical Specifications
| Brand / Model | Allen‑Bradley 1747-L543/C (SLC 5/04 Processor) |
| HS Code | 8537.10 (Industrial control equipment, for a voltage ≤ 1000 V) |
| Power Requirements | Supplied by 1746 chassis backplane (5 VDC); typical consumption ~1.0 A at 5 VDC |
| User Memory | 32K words battery‑backed RAM (optional EEPROM memory module supported) |
| Communication Interfaces | Channel 0: RS‑232 (DF1, DH‑485, ASCII); Channel 1: DH+ (57.6/115.2 kbps, some firmware supports 230.4 kbps) |
| Signal I/O Types | CPU module only; I/O via 1746 local/remote racks (digital, analog, specialty) |
| Dimensions & Weight | Approx. 145 × 45 × 130 mm (H × W × D); approx. 0.35 kg |
| Operating Temperature | 0 to 60 °C; 5–95% RH non‑condensing |
| Installation Method | Installs in left‑most slot of 1746 chassis; chassis supports DIN‑rail or panel mounting |
| Programming | Configured with RSLogix 500 via Channel 0 (typical 1747‑CP3/1756‑CP3 style serial cable) |
Application Fields
- Discrete manufacturing and packaging lines where DH+ HMIs and drives are still in service.
- Process skids and utilities (boilers, water treatment) that benefit from proven SLC logic and quick spares availability.
- Material handling and intralogistics systems using 1746 digital/analog I/O and serial barcode/print/applicators.
- Plant expansions that need a drop‑in CPU upgrade without changing the 1746 chassis or rewiring I/O.
Advantages & Value
- Reliability: Series C SLC 5/04 hardware is well‑proven; in most cases it runs for years with only routine battery changes.
- Compatibility: Works with existing 1746 racks and I/O; supports DH+ for legacy PanelView and peer devices.
- Cost savings: No need to rewire or requalify I/O; extend asset life while planning long‑term migrations.
- Supportability: Easy to program with RSLogix 500; plenty of field experience and spare parts availability.
Installation & Maintenance
- Environment: Mount chassis in a clean, ventilated panel; maintain ambient 0–60 °C with adequate airflow around the rack.
- Wiring: Use shielded serial cables for Channel 0; respect DH+ trunk/drop length, termination, and baud rate settings.
- Grounding: Bond panel and follow grounding best practices to reduce noise on DH+ and analog I/O modules.
- Battery: Replace the lithium battery on a planned interval; verify program retentive settings after replacement.
- Firmware/config: Keep a backup of the .RSS file and comms configuration; routine validation after edits helps avoid nuisance faults.
- Cleaning: Periodically remove dust from the chassis and connectors; check for loose terminal screws on nearby I/O modules.
Quality & Certifications
- Certifications: Typically CE and UL/cUL for industrial control equipment; conforms to applicable EMC requirements.
- Warranty: 365‑day warranty coverage from us on this item.
Helpful Accessories (often paired)
- 1746 series chassis and power supply (size to your I/O count)
- Serial programming cable (1747‑CP3/1756‑CP3 style) or USB‑to‑Serial adapter
- Lithium memory battery for scheduled replacement
- DH+ tap/terminators and cabling for correct network layout
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