1757-SRM 系统冗余模块 以提高过程系统的可用性
【产品详情】
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。这是通过使用与安装在两(2)个不同的ControlLogix机箱上的主控制器同步的辅助控制器来完成的。
当实现冗余控制器系统时，必须安装两(2)个相同的ControlLogix机箱。机箱尺寸、模块安装定位、系统供电、模块改版等应匹配。这符合冗余控制器设置的条件。其中一个底盘将被称为主要，而另一个是次要底盘。
1757-SRM具有光纤端口，连接62.5/125微米多模光纤电缆，带有SC连接器。线缆的另一端连接到安装在另一个ControlLogix机箱上的partner 1757-SRM。该电缆作为各模块和整个二级机架的同步链路。
1757-SRM为2槽位模块。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，在这对机箱中，哪一个是主机箱。COM指示灯表示通信和同步状态。“健康状态”指示灯显示模块是否处于自检、严重故障或正常运行状态。
1757-SRM兼容ControlLogix机箱1756-A4、1756-A7、1756-A10、1756-A13或1756-A17和系统电源1756-PA72、1756-PA75、1756-PB72或1756-PB75。对于1756-A4，推荐安装槽位为1或2;1756-A7是槽位4或5;1756-A10为5或6槽位;1756-A13为4号或5号槽位，1756-A17为5号或6号槽位。
Allen-Bradley 1757-SRM ProcessLogix和ControlLogix系统冗余模块是一种固态器件，用于关键工业应用，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，以保证始终运行。1757-SRM冗余模块可安装在ControlLogix机箱的任意空闲槽位，但建议预先定义每个ControlLogix槽位的卡的安装顺序。两个PLC系统，称为主PLC系统和辅助PLC系统，应该是相同的冗余系统工作适当。
安装在主PLC和辅助PLC机箱中的Allen-Bradley 1757-SRM ProcessLogix和ControlLogix系统冗余模块需要通过使用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)。一旦两个底盘组装并连接起来，就可以指定哪个是主底盘，哪个是副底盘。如果它们是相同的，那么将保证冗余控制，并且在第一个PLC出现故障的情况下，第二个PLC将接管应用程序并发出警报以通知最终用户该事件，而不会同时停止关键进程。
1757-SRM 系统冗余模块 以提高过程系统的可用性
【英文介绍】
The 1757-SRM is an Allen-Bradley ProcessLogix and ControlLogix module that is used for implementing controller redundancy to increase a process system availability. This is done by employing a secondary controller synchronized with a primary controller installed on Two (2) different ControlLogix chassis.
When implementing a redundant controller system, Two (2) identical ControlLogix chassis must be installed. The chassis size, the modules installed and positioning, System power supply and module revisions should match each other. This qualifies the redundant controller setup. One of the chassis will be termed as primary while the other is secondary chassis.
The 1757-SRM features a Fiber Optic port where a 62.5/125-micron multi-mode fiber-optic cable with SC connector is connected. The other end of the cable connects to the partner 1757-SRM installed on the other ControlLogix chassis. This cable serves as the synchronization link of the modules and the entire secondary rack.
The 1757-SRM is a Two (2) slot module. It has module status display that indicates text codes that represent the module operational status. The PRI LED inform the user which of the chassis within the pair operates as the primary chassis. The COM LED represents the communication and synchronization status. The Health status LED indicates if the module is performing self-test, experienced critical failure or operating normally.
The 1757-SRM is compatible with ControlLogix chassis 1756-A4, 1756-A7, 1756-A10, 1756-A13, or 1756-A17 and System Power Supplies 1756-PA72, 1756-PA75, 1756-PB72, or 1756-PB75. For 1756-A4, recommended installation slot is 1 or 2; 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.
The Allen-Bradley 1757-SRM ProcessLogix and ControlLogix System Redundancy Module is a solid-state device that is employed in critical industrial applications that should not be stopped under any circumstances in order to provide a redundancy system by using an identical pair of PLCs to guarantee operation at all times. The 1757-SRM redundancy module is designed for installation in any free slot of a ControlLogix chassis but predefining the order of the cards to install in each ControlLogix slot is recommended. Both PLC systems, called the primary and secondary PLC systems, should be identical for the redundancy system to work appropriately.
The Allen-Bradley 1757-SRM ProcessLogix and ControlLogix System Redundancy Modules installed in primary and secondary PLC chassis will need to be interconnected by using a 1757-SRCxx Fiber-optic Cable. 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 both chassis are assembled and connected, it can be designated which one will be the primary chassis and which will be the secondary chassis. If they are the same, then redundant control will be guaranteed and in case of a failure in the first PLC, the second one will take over the application process and signal an alarm to inform the final users of the event without stopping the critical process in the meantime.
1757-SRM 系统冗余模块 以提高过程系统的可用性
【其他型号推荐】
| A-B | 1794-ACN15通讯模块 | A-B | 1756-CN2R | A-B | 1747-L514 |
| A-B | 1786-TPS/C通讯电缆连接器 | A-B | 1761-NET-ENI | A-B | 1746-NI8 |
| A-B | 1746-NO4I | A-B | 1756-1F16 | A-B | 1756-OW16I |
| A-B | 1794-ACNR15XT/D | A-B | 1768-L43 | A-B | 1756-IM16I |
| A-B | 1756-ENBT/A | A-B | 1756-L74 | A-B | 1756-TBCH |
| A-B | 80026-044-06-R | A-B | 1756-PB75 | A-B | 2711P-T10C4D8 |
| A-B | 1756-L73 | A-B | 1756-PA72 | A-B | 1769-L32E |
| A-B | 1756-EN2T | A-B | 1756-IM16I | A-B | 2098-DSD-020X |
| A-B | 1756-A4 | A-B | 1769-OW8I | A-B | 2098-DSD-020X |
| A-B | 1756-OB32 | A-B | 1769-IQ32 | A-B | MVI56-MCM水晶头 |
| A-B | 1756-OB32 | A-B | 1756-A13 | A-B | MVI56-MCM光盘 |
| A-B | 1756-IF16 | A-B | 1756-IRT8I | A-B | 1769-ADN |
| A-B | 1783-ETAP | A-B | 1756-OA8 | A-B | 1797-PS2E2/A |
| A-B | 2711P-RTMC | A-B | 1756-L71 | A-B | 1756-IF16 |
| A-B | 1761-NET- ENI | A-B | 1756-TBCH | A-B | 1756-EN2TR |
【常见问题】
1）备件
2）保修期：12个月！
3）包装：原包装与纸箱。
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5）所有货物将在发货前进行测试。
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