1747-L514 | Allen-Bradley SLC 501 | Modular Processor Unit

Product Overview

The 1747-L514 is a foundational modular processor within the Allen-Bradley SLC 500 family, specifically designated as an SLC 5/01 controller. Engineered for entry-level to mid-range industrial automation tasks, the 1747-L514 (PN: 1747-L514) provides a reliable execution environment for discrete and analog control. It resides exclusively in Slot 0 of an SLC 500 chassis and supports DH-485 communication for networked data exchange and programming.

Technical Specifications

• Manufacturer Allen-Bradley / Rockwell Automation

• Product Line SLC 500 Modular Hardware

• Model Number 1747-L514

• Processor Type SLC 5/01

• User Program Memory 4K Instructions (approx. 4,000 words)

• Memory Storage Capacitor-backed RAM (Internal)

• Non-Volatile Backup Compatible with 1747-M1 (1K) and 1747-M2 (4K) EEPROM modules

• EEPROM Adapter Socket 1747-M5

• Maximum I/O Capacity 960 Discrete I/O points

• Analog I/O Capacity 480 points

• Chassis Expansion Supports up to 3 interconnected chassis

• Max Module Count 30 local I/O modules

• Typical Program Scan Time 8 milliseconds per 1K

• I/O Scan Time 2.6 milliseconds

• Communication Interface DH-485 (RJ-45 port)

• Backplane Current (5V DC) 350 mA

• Backplane Current (24V DC) 105 mA

• Operating Temperature 32-140°F (0-60°C)

• Shipping Weight 0.75 lbs (0.34 kg)

Supported Instruction Sets

The 1747-L514 utilizes a robust instruction set suitable for standard logic and mathematical operations, including:

• Bit-level logic (XIC, XIO, OTE, etc.)

• Timer and Counter instructions (TON, TOF, RTO, CTU, CTD)

• Comparison operations (EQU, NEQ, LES, GRT)

• Basic Math (ADD, SUB, MUL, DIV)

• Data Handling (Move, Copy, Bit Shift)

• Program Flow Control (Jump, Subroutine, MCR)

• Sequencer instructions for automated step-based logic

Frequently Asked Questions

• How long will the capacitor-backed RAM hold the program without power?

  The internal capacitor of the 1747-L514 is designed to retain memory for short periods (typically several days to a few weeks depending on ambient temperature). For long-term storage, a 1747-M1 or 1747-M2 EEPROM is required.

• Does the 1747-L514 support EtherNet/IP or ControlNet?

  Native support is limited to DH-485. Connecting to Ethernet would require an external bridge such as a 1761-NET-ENI or upgrading to a higher-tier SLC processor like the 5/05.

• Can this processor be placed in any slot?

  No, the 1747-L514 must always be installed in Slot 0 (the leftmost slot) of the primary local chassis.