Description
Allen‑Bradley 1756-L73 is a ControlLogix 5570 PAC Controller (Processor Module) from Rockwell Automation
Product Title & Description
Model: 1756-L73 The Allen‑Bradley 1756-L73 is a ControlLogix 5570 PAC Controller (Processor Module) from Rockwell Automation. It is a mid-high tier rack-based programmable automation controller with 8MB user memory, designed for complex discrete, process and motion control applications. Widely used in automotive production lines, packaging machinery, power plants, water treatment, metallurgy and petrochemical plants. It supports redundant controller architecture, high-speed backplane communication, multi-axis motion control and abundant network expansion for large-scale automation systems.
1756-L73S
Core Product Overview
1756-L73 belongs to ControlLogix 5570 processor family. It executes control logic, handles backplane I/O data exchange, motion control and network communication. It has no built-in Ethernet port; EtherNet/IP or other fieldbus functions are realized by adding separate 1756 communication modules. It features a front-panel 4-character alpha-numeric status display, USB 2.0 local programming port, and SD card slot for program backup/firmware upgrade. It supports hot standby redundancy when paired with another identical 1756-L73 in redundant chassis. It can manage up to 128,000 digital I/O points and 4,000 analog I/O points, supports maximum 100 motion axes, and works with the full range of 1756 series I/O, communication and specialty modules. Program development and download use Studio 5000 Logix Designer software.
Main Technical Specifications
- Manufacturer: Rockwell Automation (Allen‑Bradley)
- Part Number: 1756-L73
- Product Type: ControlLogix 5570 PAC Processor
- User Memory: 8 MB
- I/O Memory: 0.98 MB
- Max Digital I/O: 128,000
- Max Analog I/O: 4,000
- Supported Motion Axes: 100
- Local Port: USB 2.0 full speed for programming
- Storage: SD card slot (for backup / firmware update)
- Redundancy: Support 1:1 hot standby redundant system
- Backplane Power: 5.1VDC @ 800mA; 1.2VDC @ 5mA
- Power Dissipation: 2.5 W
- Mounting: Single slot inside 1756 ControlLogix chassis
- Operating Temperature: 0°C ~ +60°C
- Storage Temperature: -40°C ~ +85°C
- Relative Humidity: 5% ~95%, non-condensing
- Certifications: CE, UL, CSA, CCC
- Retention: 1756-ESMCAP energy storage module for data retention
Quality Control Procedures
Rockwell ControlLogix controllers comply with ISO9001 and IEC 61131‑2 standards.
- Incoming Component Inspection: CPU, memory chips, PCBs, USB & SD interface components screened from approved suppliers.
- Automated Assembly & Serial Traceability: SMT automated assembly. Unique serial number enables full lifecycle traceability.
- Full Functional Test: Logic execution test, backplane communication, USB/SD function, motion instruction simulation and redundancy synchronization verification.
- Environmental Stress Screening: Thermal cycling, vibration, EMC and power cycling test for industrial cabinet environments.
- Final Inspection & Packing: Visual inspection, anti-static packaging, factory test documentation included.
1756-L73S
Brand Related Model Recommendations
- 1756-L71: 2MB memory, entry level 5570 controller for small projects.
- 1756-L72: 4MB memory, mid-range processor.
- 1756-L74: 16MB memory, high-performance model for very large programs.
- 1756-L73XT: Extreme temperature version, wider temperature range -25°C ~ +70°C.
- 1756-EN2T: EtherNet/IP communication module commonly paired with 1756-L73.
Frequently Asked Questions (FAQ)
Q1: What software programs 1756-L73? A1: Studio 5000 Logix Designer (formerly RSLogix 5000). Firmware version must match the software release.
Q2: Does 1756-L73 have built-in Ethernet port? A2: No. You need to add separate 1756 communication modules (such as 1756-EN2T) for EtherNet/IP networking.
Q3: Does it support hot standby redundancy? A3: Yes, it can form redundant control system with a second 1756-L73 and redundant chassis/power supply.
Q4: What is the SD card used for? A4: Backup application program, store tag data and perform firmware upgrade.
Q5: What is the warranty for original Allen‑Bradley 1756-L73? A5: Original Rockwell module carries standard 12-month factory warranty against manufacturing defects under proper installation and operation.
Installation & Configuration Guide
7.1 Pre-installation Preparation
Verify 1756-L73, inspect front display, USB and SD slot for damage. Prepare 1756 chassis, power supply, I/O modules, communication modules, Studio 5000 software, SD card. Cut chassis power before handling the module, wear ESD protection. Confirm firmware compatibility if building redundant system.
7.2 Installation Steps
Insert 1756-L73 into the designated CPU slot of ControlLogix chassis and lock the module. Install power supply, I/O and communication modules in remaining slots. Wire backplane power, field I/O cables and network cables. Keep proper cabinet ventilation. If redundant, install second identical CPU, redundant power and redundancy cable.
7.3 System Configuration & Commissioning
Open Studio 5000, add 1756-L73 and all I/O/comm modules into hardware tree. Configure redundancy settings if required. Write control logic, motion programs and tag definitions. Download project to controller via USB or EtherNet/IP. Power up chassis and check front LED and numeric display. Perform offline simulation first, then no-load and on-load commissioning. Test redundancy switchover for redundant system. Backup program to SD card and save commissioning logs.
7.4 Maintenance & Precautions
Check cabinet temperature, power supply health and module status during shutdown outages. Inspect SD card and USB port for dust. Do not remove or insert module when chassis is powered unless supporting RIUP. If communication or logic faults occur, check backplane, firmware version and network modules before replacing the processor.
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