The Allen‑Bradley 1747‑L541 is an SLC 5/04 modular processor from Rockwell Automation's SLC 500 family, offering 16K words of user memory and supporting up to 4,096 discrete I/O points. It features built-in Data Highway Plus (DH+) and RS-232 communication ports, enabling high-speed peer-to-peer messaging with PLC-2, PLC-5, and ControlLogix processors.
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1747-L541Order(MOQ) :
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3-5daysWeight :
3KG| Specification | Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen‑Bradley) |
| Model | 1747‑L541 |
| Product Family | SLC 500 / SLC 5/04 Processor |
| Product Type | Modular Programmable Controller |
| User Memory | 16K words (battery-backed RAM) |
| Max Discrete I/O | 4,096 inputs / 4,096 outputs |
| Max Analog I/O | 480 points |
| Local Chassis | Up to 3 chassis / 30 total slots |
| Program Scan Time | 0.9 ms per 1K instructions (typical) |
| Bit Execution (XIC) | 0.37 µs |
| Built‑in Communication | DH+ (Channel 1), RS‑232 (Channel 0) |
| RS‑232 Protocols | DF1 Full‑Duplex, DF1 Half‑Duplex, ASCII, DH‑485, Modbus RTU |
| DH+ Baud Rate | 57.6 kbps or 230 kbps |
| Programming Software | RSLogix 500 |
| Backup Memory | 1747‑M13 flash memory module (optional) |
| Battery | 1747‑BA battery for memory retention |
| Backplane Current Draw | 1 A @ 5V DC |
| Operating Temperature | 0°C to +60°C |
| Protection Class | Open‑type (chassis mount) |
| Product Status | Discontinued / Legacy |
| Model | Description | Typical Application |
|---|---|---|
| 1747‑L542 | SLC 5/04 processor with 32K user memory | Applications requiring more memory than L541 |
| 1747‑L543 | SLC 5/04 processor with 64K user memory | Large, complex applications with extensive program logic |
| 1747‑L551 | SLC 5/05 processor with 16K memory and built‑in Ethernet | Migration path requiring Ethernet connectivity |
| 1747‑L552 | SLC 5/05 processor with 32K memory and built‑in Ethernet | Higher‑memory alternative with Ethernet |
| 1747‑L553 | SLC 5/05 processor with 64K memory and built‑in Ethernet | Large‑scale applications needing Ethernet |
| 1756‑L61/L71 | ControlLogix 5561/5571 controllers | Full migration path to ControlLogix platform |
| 1747‑M13 | Flash memory backup module | Non‑volatile program storage for SLC 5/04 |
| 1747‑BA | Replacement battery for memory retention | Battery replacement for L541 |
| 1761‑NET‑ENI | Ethernet interface module (external) | Adding Ethernet TCP/IP connectivity to SLC 5/04 |
| 1747‑KFC15 | ControlNet interface module | Adding ControlNet connectivity |
| 2711P-K6M20D | 1756-RM2 | 1769-L33ERM |
| 2711P-T10C22D9P | 1756-PAR2 | 1769-OF8C |
| 2711-K10C3 | 1756-A4 | 1769-IF8 |
| 2711-K5A2 | 1756-RMC1 | 1769-IF16C |
| 2711-K5A20 | 1756-PAR2 | 1769-IR6 |
| 2711P-T10C4D8 | 1756-N2 | 1769-OW16 |
| 2711P-T7C22D9P | 1756-A10 | 1769-PA4 |
| 2711P-RP8D | 1756-IF16 | 1747-L553/C |
| 2711P-T12W22D9P | 1756-OF8 | 1783-LMS8 |
| 2711P-T7C21DBS | 1756-IB16 | 1783-USBT |
| 2711PT15C21D8S | 1756-OB16 | 1784-CF64 |
| 2711P-T10C21D8S | 1756-TBCH | 1734-OE2C |
| 2711P-T12C4D8 | 1756-TBNH | 1734-IR2E |
| 2711P-RDT10C | 1756 L83E | 1734-OB8S |
| 2711P-K10C4D8 | 1756 IF8H | MVI56E-MNET |
| 2198-H015-ERS | 1756-OB16E | 1715-AENTER |
| 2198-H025-ERS2 | 1756-IR6I | EXTER T150 |
| 2094-BM01-S | 1756-PB72 | 1756-IF16 |
Q1: Which communication ports are built into the 1747‑L541?
The 1747‑L541 has two built‑in ports:
Channel 1 (DH+): Supports Data Highway Plus communication at 57.6 kbps or 230 kbps, enabling messaging with PLC‑2, PLC‑5, SLC, and ControlLogix processors.
Channel 0 (RS‑232): Supports DF1 full/half‑duplex, ASCII, DH‑485, and Modbus RTU protocols.
Q2: Is the 1747‑L541 still in production?
No. The 1747‑L541 has been discontinued by Rockwell Automation. It is now a legacy product available only through the used/refurbished market.
Q3: What is the maximum I/O capacity of the SLC 5/04 system with this processor?
The SLC 5/04 system supports up to 4,096 discrete inputs and 4,096 discrete outputs, plus 480 analog I/O points, across a maximum of 3 chassis and 30 total slots.
Q4: Can I replace a 1747‑L541 with a newer processor without rewriting the program?
Yes, but with considerations:
Within SLC 5/04 family: You can upgrade to 1747‑L542 (32K) or 1747‑L543 (64K). The program will run without modification, and RSLogix 500 allows processor type change in the project.
To SLC 5/05: Migration requires verifying Channel 1 communication differences – SLC 5/05 supports DH+ and Ethernet (Channel 0), but DH+ pin‑out is the same as L541.
To ControlLogix: A complete program conversion is required.
Q5: What programming software is required for the 1747‑L541?
The 1747‑L541 is programmed using RSLogix 500 running on Windows. RSLogix 500 supports the entire SLC 500 family, including SLC 5/01, 5/02, 5/03, 5/04, and 5/05 processors.
The Allen-Bradley 1746-P1 is a rack-mount power supply for the SLC 500 programmable controller family. It accepts 120/240V AC input and provides 2A at 5V DC and 0.46A at 24V DC backplane power, along with a 200 mA user-power output for external sensors.
The Allen‑Bradley 1746‑NI4 is a 4‑channel analog input module for the SLC 500 programmable controller family. It accepts voltage (±10V DC) or current (±20mA) signals from field devices such as pressure transmitters, temperature sensors, and level transducers, converting them into digital values for use in the PLC's control program.
The Allen‑Bradley 1747‑L542 is an SLC 5/04 modular processor from Rockwell Automation's SLC 500 family, offering 32K words of user memory and supporting up to 4,096 discrete I/O points. As the mid-range model in the 5/04 series, it features built-in Data Highway Plus (DH+) and RS-232 communication ports, enabling high-speed peer-to-peer messaging with PLC-5, SLC, and ControlLogix processors.
he Allen‑Bradley 1747‑KFC15 is a ControlNet RS‑232 Interface Module for the SLC 500 platform that acts as a DF1‑to‑ControlNet bridge. It connects SLC 5/03, 5/04, or 5/05 processors to a ControlNet network via the processor's Channel 0 serial port, enabling deterministic data exchange with ControlNet‑capable HMIs, drives, and other controllers.
The Allen‑Bradley 1747‑L541 is an SLC 5/04 modular processor from Rockwell Automation's SLC 500 family, offering 16K words of user memory and supporting up to 4,096 discrete I/O points. It features built-in Data Highway Plus (DH+) and RS-232 communication ports, enabling high-speed peer-to-peer messaging with PLC-2, PLC-5, and ControlLogix processors.
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