Overview
The Allen-Bradley 1747-L524 is a modular SLC 500 processor (SLC 5/02) designed for industrial automation and control systems. This processor unit delivers scalable I/O capacity, integrated DH485 communication, and advanced control features including built-in PID algorithm support. It occupies Slot 0 of the SLC 500 chassis and supports a wide range of digital, analog, and specialty I/O modules, making it suitable for process machinery, HVAC systems, packaging equipment, and general manufacturing automation.
Key Features
- Modular Design: Single-slot processor supporting up to 4096 discrete inputs and 4096 discrete outputs, with maximum 480 local analog I/O points
- 4K User Memory: Integrated 4KB battery-backed RAM with optional EEPROM module support for nonvolatile program backup
- DH485 Communication: Built-in serial port for messaging with HMIs, SCADA systems, and other Allen-Bradley controllers (PLC-5, CompactLogix, ControlLogix)
- Advanced Control Logic: Native support for PID algorithms, address indexing, process interrupts, and 32-bit signed arithmetic operations
- Diagnostics & Monitoring: Front panel LED indicators for CPU mode, fault status, I/O forcing, communication status, and battery voltage
- User-Replaceable Battery: Battery (1747-BA) is field-replaceable with 2-year estimated lifespan and does not require power-down
Technical Specifications
- Processor Type: SLC 5/02 (SLC 500 modular)
- User Memory (Max): 4K instructions
- Maximum I/O Addressing: 4096 discrete inputs + 4096 discrete outputs
- Analog I/O (Local, Max): 480 points
- Program Scan Time: Approximately 0.9–8.0 ms/K (instruction dependent)
- I/O Scan Time: 0.25–2.6 ms (module and configuration dependent)
- Communication Port: DH485 serial (optional RS-232 available on some models)
- Local I/O Chassis Support (Max): 3 chassis
- I/O Module Slots per Chassis (Max): 30
- Chassis Slot Position: Slot 0 (fixed, single-slot module)
- Memory Backup: Battery-backed RAM (1747-BA battery required)
- Operating Temperature: Typical 0 to 60°C (specifications vary by series revision)
- Certifications: UL, CE (varies by revision)
- Series Designation: Series C (also available in earlier series)
Typical Applications
- Industrial machinery control and sequencing
- HVAC and process temperature management
- Packaging and conveyor system automation
- Water treatment and environmental control systems
- General discrete and analog process control
- Material handling and warehouse automation
- Building automation and facility management
- Third-party integration via DH485 messaging protocols
Compatibility & Replacements
Compatible With
- SLC 500 modular I/O chassis (1746-A2, 1746-A4, 1746-A10, 1746-A13)
- Over 60 SLC 500 I/O modules (digital input/output, analog input/output, scanner, intelligent, and specialty modules)
- SLC 500 communication networks: DH485, Remote I/O (up to 4096 I/O via Remote I/O)
- Allen-Bradley HMI systems (PanelView, FactoryTalk View)
- SCADA platforms supporting DH485 or serial protocols
- Third-party automation systems with DH485 interface capability
- Programming and diagnostics: RSLogix 500 (legacy), CompactLogix, and ControlLogix messaging
- 1747-PIC programming cable for local program upload/download
Replaces / Drop-In Replacement For
- Earlier SLC 5/02 revisions of the 1747-L524 (e.g., Series A, Series B)
- Verify exact revision compatibility with system integrator before replacement, as some EEPROM modules or ancillary equipment may require testing
- Not directly interchangeable with SLC 5/01 (1747-L511), SLC 5/03, SLC 5/04, or SLC 5/05 processors without system reconfiguration
Works With
- Programming Software: RSLogix 500 (legacy platform)
- Communication Protocols: DH485, Remote I/O, optional Ethernet via separate gateways
- Companion Hardware: 1747-BA battery (backup power), 1747-M2 EEPROM modules (program storage), 1747-PIC programming interface
- Integration Platforms: FactoryTalk View HMI, third-party SCADA systems, EtherNet/IP gateways (via external modules)
