Allen-Bradley 1747-L541 SLC 5/04 Processor Overview

The Allen-Bradley 1747-L541 is an SLC 5/04 processor for SLC 500 modular hardware. This controller features 16 KB of battery-backed RAM memory. The 1747-L541 handles up to 4,096 input points and 4,096 output points. It also supports 480 analog I/O channels. User memory capacity reaches 16,000 words for programs and data. The I/O scan time is only 0.225 milliseconds for fast response. Consequently, the 1747-L541 excels in medium-sized control applications.

Communication Interfaces

The Allen-Bradley 1747-L541 includes two built-in communication ports. First, a Data Highway Plus (DH+) port supports extended messaging capabilities. This port enables high-speed communication and multi-drop topology. Second, an RS-232 port supports DF1 radio modem, DH-485, ASCII, and Modbus RTU protocols. The RS-232 port default settings include 19.2 Kbaud, CRC error check, duplicate packet detection, and no parity. The DH+ port defaults to 57.6 Kbaud with node address 1. Therefore, the 1747-L541 connects easily to various networks.

You can also use the RS-232 port with a 1761-NET-AIC adapter. This configuration allows the serial port to connect to a multi-drop DH-485 network. This flexibility expands the 1747-L541 connectivity options.

Performance Specifications

The Allen-Bradley 1747-L541 delivers impressive performance for its class. Program scan time per keyword is 0.9 milliseconds . The controller supports 3 I/O chassis with up to 30 module slots total. Backplane current draw is 1 Amp at 5 Volts DC . Additionally, it draws 200 mA at 24 Volts DC . The 1747-L541 includes a 1-millisecond Selectable Timed Interrupt (STI) . It also provides 0.5 millisecond Discrete Input Interrupt (DII) for fast event handling. For program and data table backup, use a 1747-M13 flash memory device with 64 KB capacity. The processor uses a 1747-BA battery for memory backup.

Front Panel Features

The Allen-Bradley 1747-L541 includes a convenient front panel design. A 3-position key switch allows selection of Run, Remote, or Program modes. The processor includes several LED status indicators for diagnostics. These include RUN, FLT, BATT, FORCE, DH+, and RS-232 indicators. Therefore, troubleshooting becomes quick and straightforward. The battery LED warns when you need to replace the 1747-BA battery.

Environmental & Certification Specifications

The Allen-Bradley 1747-L541 operates reliably in industrial environments. Ambient operating temperature ranges from 0°C to 60°C . The controller holds UL listing to US and Canadian Safety Standards. It also carries CE compliance and C-Tick marking . Therefore, the 1747-L541 meets international regulatory requirements.

Typical Applications

The Allen-Bradley 1747-L541 suits a wide range of industrial applications. Common uses include HVAC control, SCADA systems, and material handling. The controller supports distributed I/O applications. For this purpose, use a communication adapter on the CPU rack and communication scanners on I/O racks. The 1747-L541 also supports remote I/O, DeviceNet pass-through, and indirect addressing. Advanced math instructions and various additional instructions simplify complex programming.

Key Features & Benefits

• 16 KB user memory – The 1747-L541 stores up to 16,000 words of program and data.

• Dual communication ports – DH+ and RS-232 provide flexible networking options.

• High I/O capacity – Handles 4096 discrete I/O and 480 analog I/O points.

• Fast scan times – 0.225 ms I/O scan and 0.9 ms program scan per K.

• Interrupt capabilities – STI and DII support time-critical event handling.

• Comprehensive diagnostics – Six LED indicators show processor and network status.

Installation Guidelines

Follow these steps to install the Allen-Bradley 1747-L541 correctly. First, power down the SLC 500 chassis completely. Second, select the leftmost slot (slot 0) for the processor module. Third, align the 1747-L541 with the card guides in the chassis. Fourth, push the module firmly into the backplane connector until fully seated. Fifth, secure the module with the retaining screws. Finally, connect the DH+ and RS-232 cables to the appropriate ports.

Set the key switch to the desired mode before applying power. Configure the communication ports using your programming software. The 1747-L541 requires an SLC 500 power supply to power the backplane.

Package Contents

Your shipment includes the following items:

• 1 x Allen-Bradley 1747-L541 SLC 5/04 processor module

• 1 x 1747-BA battery (installed)

• 1 x Installation instructions manual

No communication cables are included with the 1747-L541 . Therefore, you must order DH+ or RS-232 cables separately. No programming software is provided.

Frequently Asked Questions (FAQ)

1. What is the maximum I/O capacity of the 1747-L541?
The Allen-Bradley 1747-L541 handles up to 4,096 discrete inputs and 4,096 discrete outputs. It also supports 480 analog I/O channels.

2. What memory backup options does this processor support?
The 1747-L541 uses a 1747-BA battery for RAM backup. For non-volatile program storage, use the 1747-M13 flash memory module.

3. Can I use the RS-232 port for DH-485 networking?
Yes. You can connect the RS-232 port to a 1761-NET-AIC adapter. This configuration allows the 1747-L541 to join a multi-drop DH-485 network.

4. What is the program scan time of this controller?
The Allen-Bradley 1747-L541 has a program scan time of 0.9 milliseconds per kiloword. The I/O scan time is 0.225 milliseconds.

5. Is this processor suitable for distributed I/O applications?
Yes. The 1747-L541 supports distributed I/O using a communication adapter on the CPU rack. Install communication scanners on remote I/O racks for expansion.

Why Choose the Allen-Bradley 1747-L541?

This SLC 5/04 processor delivers reliable control for medium-sized automation applications. For starters, the Allen-Bradley 1747-L541 provides 16KB of battery-backed memory for programs and data. It handles up to 4,096 discrete I/O points and 480 analog I/O channels. The built-in DH+ port supports high-speed multi-drop communication. The RS-232 port offers DF1, DH-485, ASCII, and Modbus RTU protocol support. You can also connect the serial port to a 1761-NET-AIC adapter for DH-485 multi-drop networks. Program scan time of 0.9 ms per K ensures responsive control. I/O scan time of only 0.225 ms minimizes input-to-output delay. The 1747-L541 includes STI and DII interrupts for time-critical event handling. Six LED indicators provide clear status information for troubleshooting. The 3-position key switch allows convenient mode selection. Most importantly, this processor integrates seamlessly into existing SLC 500 systems.

Order the Allen-Bradley 1747-L541 today for your SLC 500 control needs. Specifically, this processor is perfect for HVAC control, SCADA systems, material handling, and other medium-sized applications requiring DH+ networking and robust performance.