1757-SRM 控制逻辑机箱系统冗余模块

1757-SRM 是一个 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。这是通过使用与安装在两（2）个不同 ControlLogix 机箱上的主控制器同步的辅助控制器来完成的。

实施冗余控制器系统时，必须安装两（2）个相同的 ControlLogix 机箱。机箱尺寸、安装和定位的模块、系统电源和模块版本应相互匹配。这符合冗余控制器设置的条件。其中一个机箱将称为主机箱，而另一个机箱称为辅助机箱。

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1757-SRM 控制逻辑机箱系统冗余模块

概述：

1757-SRM 具有光纤端口，其中连接了带 SC 连接器的 62.5/125 微米多模光纤电缆。缆线的另一端连接到安装在另一个 ControlLogix 机箱上的合作伙伴 1757-SRM。此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，指示表示模块运行状态的文本代码。PRI LED 通知用户这对机箱中的哪个机箱用作主机箱。COM 指示灯表示通信和同步状态。运行状况 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 是插槽 4 或 5;1756-A10 是插槽 5 或 6;1756-A13 是插槽 4 或 5,1756-A17 是插槽 5 或 6。

Allen-Bradley 1757-SRM ProcessLogix 和 ControlLogix 系统冗余模块是一种固态设备，用于在任何情况下都不应停止的关键工业应用，以便通过使用一对相同的 PLC 来提供冗余系统，以保证始终运行。1757-SRM 冗余模块设计用于安装在 ControlLogix 机箱的任何空闲插槽中，但建议预先定义要在每个 ControlLogix 插槽中安装的卡的顺序。两个 PLC 系统（称为主 PLC 系统和辅助 PLC 系统）应相同，以使冗余系统正常工作。

安装在主 PLC 机箱和辅助 PLC 机箱中的 Allen-Bradley 1757-SRM ProcessLogix 和 ControlLogix 系统冗余模块需要使用 1757-SRCxx 光纤电缆进行互连。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）。组装并连接两个机箱后，可以指定哪个机箱为主机箱，哪个机箱为辅助机箱。如果它们相同，则将保证冗余控制，如果第一个PLC发生故障，第二个PLC将接管应用程序过程并发出警报以通知最终用户事件，而无需同时停止关键过程。

The 1757-SRM is an Allen-Bradley ProcessLogix and ControlLogix module for controller redundancy to improve the availability of process systems. This is done by using a secondary controller that is synchronized with the primary controller installed on two (2) different ControlLogix cases.

When implementing a redundant controller system, two (2) identical ControlLogix enclosures must be installed. The chassis dimensions, installed and located modules, system power supply, and module version must match each other. This meets the conditions set by the redundant controller. One case will be called the main case, while the other case will be called the auxiliary case.

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

The 1757-SRM is a two-slot module. It has a module status display indicating a text code that represents the module's operational status. The PRI LED informs the user which case of the pair is used as the main case. COM indicator indicates the communication and synchronization status. The health LED indicates whether the module is performing a self-test, experiencing a critical failure, or operating normally.

1757-SRM and ControlLogix chassis 1756-A4, 1756-A7, 1756-A10, 1756-A13 or 1756-A17 and system power supply 1756-PA72, 1756-PA75, 1756-PB72 or 1756-PB75 Be compatible. For 1756-A4, slot 1 or 2 is recommended; 1756-A7 is slot 4 or 5; 1756-A10 is slot 5 or 6; 1756-A13 is slot 4 or 5 and 1756-A17 is slot 5 or 6.

Allen-Bradley 1757-SRM ProcessLogix and ControlLogix System Redundancy Module is a solid-state device for critical industrial applications that should not be stopped under any circumstances in order to provide a redundant system by using a pair of identical PLCS to guarantee always operation. The 1757-SRM redundancy module is designed to be installed in any free slot in the ControlLogix chassis, but it is recommended to pre-define the order in which cards are to be installed in each ControlLogix slot. The two PLC systems (called the main PLC system and the auxiliary PLC system) should be the same to make the redundant system work properly.

The Allen-Bradley 1757-SRM ProcessLogix and ControlLogix system redundancy modules installed in the main PLC chassis and the auxiliary PLC chassis require interconnections using 1757-SRCxx fiber optic cables. 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). After the two chassis are assembled and connected, you can specify which chassis is the primary chassis and which chassis is the secondary chassis. If they are the same, redundant control will be guaranteed, and if the first PLC fails, the second PLC will take over the application process and send an alarm to notify the end user of the event without having to stop the critical process at the same time.