1756-L72 - 4 MB ControlLogix 5572 Processor | Allen-Bradley
料号： 1756-L72 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
1756-L72 概述
A programmable logic controller is an industrial control device that executes user-defined logic according to a stored program. In the broader hierarchy, this product is a PLC processor within the ControlLogix platform, which sits inside modular programmable automation systems. Unlike a standalone embedded controller, the 1756-L72 is designed around a multi-module chassis, where processor, communication, and I/O modules share a common backplane. This architecture lets engineers expand or reconfigure a control system while retaining a common Rockwell Automation programming environment.
The 1756-L72’s 4 MB user-memory figure is its headline capacity specification, while 0.98 MB of I/O memory supports controller-side I/O data handling. The processor includes USB 2.0 connectivity according to the verified distributor listing, and firmware downloads listed on the Rockwell product page include versions for both 1756-L72 and 1756-L72EROM. The available documentation also references the ControlLogix 1756 User Manual and technical-data publications, which should be consulted for complete electrical, environmental, compatibility, and replacement requirements.
Because this is a modular PLC processor rather than an electronic semiconductor, its enclosure package does not use a small IC package designation. The supplied data confirms a ControlLogix rack/chassis module format, but dimensions, terminal details, front-panel pinout, and exact connector mapping were not provided. For system design, select a compatible ControlLogix chassis and communication modules based on the required network protocols and I/O capacity. Confirm firmware revision, replacement status, module revisions, and application compatibility before replacing an existing processor.
Typical applications include high-end machine control, packaging and assembly lines, process plants, batch control, and factory systems with moderate-to-high program complexity. The 4 MB user-memory capacity is useful when the application exceeds the memory available in smaller ControlLogix processors. Network connectivity is provided through compatible ControlLogix communication modules rather than by treating the processor as a standalone Ethernet device.
For a new design, verify chassis size, power-supply capacity, module compatibility, firmware requirements, and network architecture against the manufacturer’s current technical documentation. Existing installations should preserve controller configuration and program files, document communication settings, and follow Rockwell Automation’s replacement and migration guidance. This page synthesizes the verified product specifications, source documents, compatibility references, and engineering cautions not presented as a substitute for the manufacturer’s complete manuals.
直接替换替代料： 1756-L72 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： 1756-L72 （相同外形与封装尺寸） ——差异在于 User Memory.
快速对比工具——选择替代料号进行并排对比：
1756-L72EROM
✅ 直接替换📋 参考替代料（不在目录中）
1756-L71
✅ 直接替换📋 参考替代料（不在目录中）
1756-L73
✅ 直接替换📋 参考替代料（不在目录中）
1756-L55
✅ 直接替换📋 参考替代料（不在目录中）
1756-L71EROM
✅ 直接替换📋 参考替代料（不在目录中）
1756-L72 最大额定值与电气特性
| Product Type | ControlLogix 5572 processor module |
| User Memory | 4 MB |
| I/O Memory | 0.98 MB |
| Communication Port | USB 2.0 |
| Backplane Power at 5.1 VDC | 800 mA |
| Backplane Power at 1.2 VDC | 5 mA |
| 工作温度范围 | 0°C to 60°C |
| Controller Platform | ControlLogix |
| Processor Family | Logix 5572 |
| System Architecture | Modular chassis-based programmable controller |
| Communication Support | Compatible ControlLogix communication interface modules |
| Firmware Support | Firmware versions listed for 1756-L72 and 1756-L72EROM |
| Data Retention and Programming Resources | 1784-SD1 Secure Digital card referenced in supplied ControlLogix documentation |
1756-L72 standard 引脚配置指南
1756-L72（standard 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： 1756-L72.
请参阅 数据手册 以查看完整引脚配置。
典型应用
1756-L72 适用于 6 应用s: Packaging and Assembly Machine Control, Process-Control and Batch Automation, Conveyor and Material-Handling Systems, Factory Cell Network Integration, OEM Machine Builder Platforms, Control-System Retrofit and Replacement.
Packaging and Assembly Machine Control
The Allen-Bradley 1756-L72 fits packaging and assembly systems that need a ControlLogix processor with 4 MB of user memory. Its modular architecture allows machine designers to combine the processor with local I/O and communication modules for conveyors, sensors, actuators, safety interlocks, and station sequencing. The verified 4 MB memory figure provides more capacity than the 2 MB 1756-L71 comparison result, making the L72 more appropriate when the application includes extensive state logic, diagnostics, recipes, or multiple machine sections. Confirm chassis power, module revisions, network topology, and firmware before commissioning. The processor should be installed according to Rockwell installation instructions, with system grounding, cooling, and service access planned into the control cabinet.
推荐
Process-Control and Batch Automation
The 1756-L72 can serve as the central programmable controller for process and batch equipment when the control architecture is already based on ControlLogix. Its 4 MB user memory is relevant for recipe data, alarm handling, sequencing, and equipment logic, while the supplied 0.98 MB I/O-memory figure supports controller-side I/O data handling. A process system can add compatible communication modules for distributed networks and use the ControlLogix platform for coordinated control of valves, pumps, heaters, and interlocks. The verified data does not provide a complete analog-module recommendation or environmental certification, so the engineer must verify process ratings, module accuracy, hazardous-area requirements, and controller temperature limits separately. Firmware and program backups should be controlled before any replacement.
推荐
Conveyor and Material-Handling Systems
The Allen-Bradley 1756-L72 is appropriate for conveyor and material-handling control when the system requires distributed I/O and structured machine logic. A ControlLogix chassis can host digital input and output modules for photoeyes, encoders, zone sensors, drives, and solenoid outputs, while communication interface modules connect the controller to higher-level equipment. The 4 MB user-memory capacity gives the project room for tracking logic, alarms, counters, diagnostic data, and operating modes. The supplied specification identifies 0.98 MB of I/O memory and a 0°C to 60°C operating range, but the complete system rating depends on the selected modules and enclosure. During design, calculate backplane power, maintain service clearances, and use the manufacturer’s installation instructions for grounding and wiring.
推荐
Factory Cell Network Integration
The 1756-L72 can anchor a factory cell when the controls engineer wants a ControlLogix platform rather than a standalone PLC. Its modular backplane supports communication modules and distributed I/O, allowing the same controller platform to coordinate local machine functions with supervisory networks. The supplied documentation specifically states that appropriate communication interface modules provide controller communication, so the processor should not be treated as a standalone network device. Verify the required EtherNet/IP, ControlNet, or DeviceNet architecture, node limits, bandwidth, and firmware compatibility. Because the provided web data does not include full environmental or lifecycle details for every option, confirm current Rockwell product documentation before ordering. Back up the control program and verify module revisions during replacement or migration.
推荐
OEM Machine Builder Platforms
The Allen-Bradley 1756-L72 is useful as the programmable controller in an OEM machine platform that standardizes on ControlLogix. The 4 MB user-memory capacity supports more complex control logic than the supplied 2 MB 1756-L71 comparison, which can help when the machine includes recipes, diagnostics, remote commands, and multiple operating modes. The processor is installed in a compatible chassis and populated with application-specific I/O modules, so the final bill of material must include network interfaces, power supplies, termination, and field wiring. Use the 800 mA at 5.1 VDC and 5 mA at 1.2 VDC values as part of the system power calculation, not as the total cabinet demand. Rockwell documentation should govern mechanical installation, firmware, program download, and service procedures.
推荐
Control-System Retrofit and Replacement
The 1756-L72 can be evaluated for a ControlLogix retrofit or processor replacement when the existing machine already uses the 1756 platform and the application needs more memory than the 1756-L71. The verified 4 MB user-memory specification is the principal sizing distinction identified in the supplied comparison material. However, a replacement should not be treated as automatically interchangeable: verify chassis compatibility, power-supply capacity, communication modules, I/O revision, firmware, program dependencies, and any safety or availability requirements. Preserve the existing project files and controller configuration before removal. Rockwell compatibility tools and the 1756 replacement guidance should be consulted for the exact machine revision. If a cross-manufacturer PLC is considered, engineering redesign and software migration are usually required.
推荐
推荐产品汇总
工程参考数据： 1756-L72 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 1756-L72EROM | 1756-L71 | 1756-L73 | 1756-L55 |
|---|---|---|---|---|---|
| Product Type | ControlLogix 5572 processor module | ControlLogix processor variant | Logix 5571 processor | ControlLogix controller variant | ControlLogix processor discussed in upgrade results |
| Package | ControlLogix chassis module | ControlLogix chassis module | ControlLogix chassis module | ControlLogix chassis module | ControlLogix chassis module |
| Brand | Rockwell Automation | Rockwell Automation | Rockwell Automation | Rockwell Automation | Rockwell Automation |
关键差异点
- Higher verified user-memory capacity than the 1756-L71 comparison （对比 1756-L71)
- ControlLogix 5572 processor positioning （对比 1756-L72EROM)
- Established ControlLogix module ecosystem （对比 1756-L73)
设计说明
Include the processor in the complete ControlLogix chassis power calculation. The verified listing specifies 800 mA at 5.1 VDC and 5 mA at 1.2 VDC for the 1756-L72. Add the current draw of every installed I/O and communication module, then size the power supply and protection for worst-case operating conditions. Do not treat the processor’s backplane figures as the total system demand, and verify the current ratings against the manufacturer’s technical data.
Do not assume that a ControlLogix processor is a universal drop-in replacement. Confirm the chassis, power supply, I/O modules, communication modules, firmware revision, program dependencies, and required controller features. The supplied results discuss 1756-L71 and 1756-L55 comparisons, but they do not prove universal compatibility. Back up the project and controller configuration before removal, and follow Rockwell Automation replacement guidance for the specific machine.
Plan the chassis layout for service access, signal separation, grounding, and thermal performance. Keep high-current field wiring away from sensitive communication and signal wiring where practical, and follow the installation instructions for terminal wiring and cabinet clearances. The verified 0°C to 60°C processor rating does not establish the complete system rating; enclosure temperature, adjacent modules, and chassis configuration must also meet their respective limits.
Use the lowest applicable temperature limit in the installed system rather than the 0°C to 60°C processor specification alone. Control cabinets, chassis, and neighboring modules can reduce the allowable system temperature. The supplied Rockwell technical-data result explicitly describes derating when module and chassis temperature limits differ. Validate thermal conditions during commissioning and maintain airflow and cabinet temperature monitoring for process or continuous-duty installations.
合规信息
The supplied product and distributor results do not provide verified RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification statements. AEC-Q100 is not applicable to this industrial PLC processor based on the supplied data.
