1757-SRM是Allen-Bradley ProcessLogix和ControlLogix模块，用于实现控制器冗余，以提高过程系统的可用性。这是通过采用与安装在两(2)个不同ControlLogix机箱上的主控制器同步的辅助控制器来实现的。

实施冗余控制器系统时，必须安装两(2)个相同的ControlLogix机箱。机箱大小、安装的模块和定位、系统电源和模块版本应该相互匹配。这验证了冗余控制器的设置。其中一个机箱将被称为主机箱，而另一个是辅助机箱。

1757-SRM具有一个光纤端口，其中连接了一根带SC连接器的62.5/125微米多模光缆。电缆的另一端连接到安装在另一个ControlLogix机箱上的partner 1757-SRM。该电缆用作模块和整个辅助机架的同步链路。

1757-SRM是一个两(2)插槽模块。它具有模块状态显示，指示代表模块运行状态的文本代码。PRI LED告知用户这对机箱中的哪个作为主机箱运行。COM LED表示通信和同步状态。健康状态LED指示模块是否正在执行自检、遇到严重故障或运行正常。

1757-SRM与ControlLogix机箱1756-A4、1756-A7、1756-A10、1756-A13或1756-A17以及系统电源1756-PA72、1756-PA75、1756-PB72或1756-PB75兼容。对于1756-A4，建议安装插槽为1或2；1756-A7是槽4还是5；1756年，A10是第五或第六名；1756-A13是插槽4或5，1756-A17是插槽5或6。

Allen-Bradley 1757-SRM process logix和ControlLogix系统冗余模块是一种固态设备，用于关键的工业应用中，在任何情况下都不应停止，以便通过使用一对相同的PLC来提供冗余系统，从而保证始终运行。1757-SRM冗余模块设计用于安装在ControlLogix机箱的任何空闲插槽中，但建议预先定义卡在每个ControlLogix插槽中的安装顺序。称为主要和次要PLC系统的两个PLC系统应该是相同的，以使冗余系统正常工作。

安装在一级和二级PLC机箱中的Allen-Bradley 1757-SRM process logix和ControlLogix系统冗余模块需要使用1757-SRCxx光缆进行互连。电缆的长度可以是1米(3英尺)、3米(9英尺)、10米(30英尺)、50米(150英尺)或100米(300英尺)。一旦组装并连接了两个机箱，就可以指定哪一个将是主机箱，哪一个将是次机箱。如果它们是相同的，那么冗余控制将得到保证，并且在第一个PLC出现故障的情况下，第二个PLC将接管应用过程并发出警报，以通知最终用户该事件，同时不停止关键过程。

1757-SRM

1757-SRM is an Allen Bradley ProcessLogix and ControlLogix module used to achieve controller redundancy and improve the availability of process systems. This is achieved by using an auxiliary controller synchronized with the main controller installed on two (2) different ControlLogix chassis.

When implementing a redundant controller system, two (2) identical ControlLogix chassis must be installed. The size of the chassis, installed modules and positioning, system power supply, and module version should match each other. This verifies the setting of the redundant controller. One of the chassis will be called the main chassis, while the other will be the auxiliary chassis.

The 1757-SRM has a fiber optic port that connects a 62.5/125 micron multimode optical cable with an SC connector. The other end of the cable is connected to partner 1757-SRM installed on another ControlLogix chassis. This cable serves as a synchronization link between the module and the entire auxiliary rack.

1757-SRM is a two (2) slot module. It has a module status display, indicating the text code representing the module’s operating status. PRI LED informs the user which part of the chassis operates as the main chassis. COM LED indicates communication and synchronization status. The health status LED indicates whether the module is performing self check, encountering serious faults, or running normally.

1757-SRM is compatible with ControlLogix chassis 1756-A4, 1756-A7, 1756-A10, 1756-A13, or 1756-A17, as well as system power supplies 1756-PA72, 1756-PA75, 1756-PB72, or 1756-PB75. For 1756-A4, it is recommended to install slot 1 or 2; Is 1756-A7 slot 4 or 5; In 1756, A10 ranked fifth or sixth; 1756-A13 is slot 4 or 51756-A17 is slot 5 or 6.

The Allen Bradley 1757-SRM process logic and ControlLogix system redundancy module is a solid-state device used in critical industrial applications and should not be stopped under any circumstances, in order to provide a redundant system by using a pair of identical PLCs to ensure continuous operation. The 1757-SRM redundant module is designed to be installed in any idle slot of the ControlLogix chassis, but it is recommended to pre define the installation sequence to be stuck in each ControlLogix slot. The two PLC systems, referred to as the primary and secondary PLC systems, should be identical in order for the redundant system to function properly.

The Allen Bradley 1757-SRM process logic and ControlLogix system redundant modules installed in the first and second level PLC cabinets require the use of 1757-SRCxx optical cables for interconnection. The length of the cable can be 1 meter (3 feet), 3 meters (9 feet), 10 meters (30 feet), 50 meters (150 feet), or 100 meters (300 feet). Once two chassis are assembled and connected, it is possible to specify which one will be the main chassis and which one will be the secondary chassis. If they are the same, redundant control will be guaranteed, and in the event of a failure in the first PLC, the second PLC will take over the application process and issue an alarm to notify the end user of the event without stopping the critical process.

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