Allen-Bradley 1756-L74是一种可编程自动化控制器(PAC ),用于实现工厂和过程自动化要求。该控制器采用现代设计，专为满足当今工业自动化要求而设计。

1756-L74是一个单槽宽度控制器，设计紧凑，装配简单。它是一种基于机箱的设备，由分配给机箱电子电路的背板电源在内部供电。该控制器可兼容安装在为ControlLogix系统制造的所有可用机箱中，如1756-A4、1756-A4K、1756-A7、1756-A7K、1756-A10、1756-A10K、1756-A13、1756-A13K、1756-A17、1756-A17 K

1756-L74是一种环境友好型控制器，因为它利用储能模块而不是电池来保存随机存取存储器(RAM)的内容。能量存储模块是基于电容器的，这意味着RAM存储器通过存储在电容器内的能量来保持。这些能量存储模块是可拆卸和可更换的。对于此控制器，预安装了1756-ESMCAP，而其他兼容模块包括1756-ESMNSE、1756-ESMNSEK、1756-ESMNRM和1756-ESMNRMK。

1756-L74配有16MB用户内存、0.98 MB I/O内存，并通过1784-SD1配有1GB非易失性内存。通过更换现有的1784-SD2、2 GB安全数字(SD)卡，非易失性存储器可扩展至2GB。

1756-L74通过内置USB通信端口进行通信，但是，该端口不适合工业通信。出于上述目的，用户可以安装额外的通信适配器，以支持特定的通信协议，如以太网/IP、控制网、设备网、数据高速公路Plus、远程I/O、SynchLink和第三方过程和设备网络。

它还兼容通过以太网/IP、控制网、设备网、Data Highway Plus、远程I/O和SynchLink进行的通信。其集成运动功能包括SERCOS接口、模拟选项和以太网/IP网络上的集成运动。编程语言有继电器梯形图、结构化文本、功能图和顺序功能图。

1756-L74控制器有一个16 MB的用户存储器和一个0.98 MB的I/O存储器。它总共有128，000个数字I/O和4000个模拟I/O。控制器具有兼容的储能模块，如1756-ESMCAP、1756-ESMCAPK、1756-ESMNSE、1756-ESMNSEK、1756-ESMNRM和1756-ESMNRMK模块。1756-L74控制器仅需要2.5 W的功耗和8.5 BTU/hr的散热。它有一个USB端口到系统的基本绝缘类型。对于宽度为1个插槽的1756系列，它在任何插槽上都有一个基于机箱的模块位置。可能的机箱包括1756-A4、1756-A4K、1756-A7、1756-A7K、1756-A10、1756-A10K、1756-A13、1756-A13K、1756-A17和1756-a17k。1756-L74使用标准电源，如1756-PA50、1756-PA72和175k对于电源冗余，它仅使用1756-PA75R、1756-PA75RK、1756-PB75R、1756-PB75RK、1756-PSCA2或1756-PSCA2K。1756-L74具有开放式外壳，工作温度为0-60°C，非工作温度为-40-85°C。在500 Hz、2 g时，其工作振动为10g，工作冲击为30 g，非工作冲击为50 g。

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1756-L74

The Allen-Bradley 1756-L74 is a Programmable Automation Controller (PAC) that is used for implementing factory and process automation requirements. This controller has a modern design that is specifically catered to meet the requirements of today’s industrial automation requirements.

The 1756-L74 is a single slot width controller, designed with a compact and assembly. It is a chassis-based device that is powered internally by the backplane power distributed to the chassis’ electronic circuitry. This controller is compatible for installation in all of the available chassis made for the ControlLogix system such as 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K,1756-A17, 1756-A17 K.

The 1756-L74 is an environment-friendly controller, as it utilizes energy storage module instead of batteries for keeping the contents of the Random Access Memory (RAM). Energy storage modules are capacitor based which means RAM memory is retained by the energy stored within the capacitors. These energy storage modules are removable and replaceable. For this controller, a 1756-ESMCAP is pre-installed while other compatible modules include 1756-ESMNSE, 1756-ESMNSEK, 1756-ESMNRM, and 1756-ESMNRMK.

The 1756-L74 comes with a 16MB user memory, 0.98 MB I/O memory and ships with a 1GB non-volatile memory via the 1784-SD1. The non-volatile memory may be expanded up to 2GB by replacing the existing unit the 1784-SD2, 2 GB Secure Digital (SD) card.

The 1756-L74 communicates via the built-in USB communication port, however, this port is not ideal for industrial communication. For the mentioned purpose, user may install additional communication adapters that supports specific communication protocols such as EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SynchLink and Third-party process and device networks.

It is also compatible communicating through EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, and SynchLink. Its integrated motion features are SERCOS interface, analog options, and integrated motion on the EtherNet/IP network. The programming languages are relay ladder, structured text, function diagram, and sequential function chart.