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FOXBORO 731CA-35终端显示控制器
操作和维护计划操作和维护计划有助于确保功能安全可以在系统调试后进行维护。
在役人员操作和维护通常不属于系统集成商可以提供指导和使用确保负责的人员或组织操作和维护可以使系统按规定运行安全级别。
操作和维护计划必须包括以下项目：
•清楚定义通电和断电顺序。这些定义必须确保序列不会导致结果存在危险时系统无法安全运行的时期。
•重新校准传感器和致动器的程序。这个必须包括建议的校准周期。
•定期频繁测试系统的程序，以及测试之间最大间隔的定义。
•用于维护的覆盖定义传感器和执行器。
•维护系统安全的程序。输入模块校准操作和维护计划必须包括以下建议：测量控制器输入模块的校准。
必须每隔两次测量每个模拟输入模块的校准年；
每个数字输入模块的校准必须每五次测量一次年。
计划维护在大多数系统配置中，有些元件未经测试通过系统的内部诊断-例如，最终被动元件输入/输出模块、传感器和执行器本身以及现场接线。
必须规定计划维护测试的制度，以确保任何可能最终导致系统无法完成其安全功能，不要堆积。这些测试之间的最大间隔必须在安装之前指定。强烈建议进行测试间隔小于用于计算PFD值的验证测试间隔。
现场设备维护操作和维护计划必须包括现场维护活动，如现场设备的重新校准、测试和更换。通常，这些措施的充分规定将由客户只要必要的维护覆盖和其他设施实施后，无需其他安全要求。
强烈建议在现场设备期间不要使用I/O强制维护。当AADvance控制器使用双冗余或三冗余模块时，处理模块故障配置，如果其中一个发生故障，控制器可以继续运行它的模块。但是，当模块确实存在故障时，必须将其更换为安全手册中推荐（所有模块都允许带电拆卸和冗余配置中的更换），以确保故障不会累积，多重故障条件不会导致电厂关机。
除了更换保险丝外，不支持现场维修一些终端组件。必须退回所有故障模块进行维修或根据保修和退货政策进行故障诊断随系统提供的文档。
Operation and Maintenance Plan
An Operation and Maintenance Plan helps to make sure that functional safety can be maintained after the commissioning of the system. The in-service operation and maintenance is normally outside the responsibility of the system integrator, but the system integrator can give guidance and use procedures to make sure that the persons or organizations accountable for operation and maintenance can keep the system operating to the specified safety levels. The Operating and Maintenance Plan must include the following items: • Clear definitions of power up and power down sequences. These definitions must make sure that the sequences never cause resulting periods when the system cannot operate safely when a hazard is present. • The procedures for re calibrating sensors and actuators. The recommended calibration periods must be included. • The procedures for frequently testing the system at regular intervals, together with definitions of the maximum intervals between testing. • Definitions of the overrides to be applied to be able to do maintenance to the sensors and actuators. • The procedures for maintaining system security.
Input Module Calibration
The Operation and Maintenance Plan must include recommendations to measure the calibration of controller input modules. The calibration of each analogue input module must be measured every two years; the calibration of each digital input module must be measured every five years. Planned Maintenance In most system configurations there will be some elements that are not tested by the system's internal diagnostics — for example, the final passive elements in I/O modules, the sensors and actuators themselves, and the field wiring. A regime of planned maintenance testing must be specified to make sure that any faults, which could ultimately cause the system's inability to fulfill its safety functions, do not build up. The maximum interval between these tests must be specified before installation. It is highly recommended the test interval be less than the Proof Test Interval used to calculate the PFD values. Field Device Maintenance The Operation and Maintenance Plan must include field maintenance activities, such as re-calibration, testing and replacement of field devices.In general, sufficient provision for these measures will be specified by the client. As long as the necessary maintenance overrides and other facilities are implemented, no other safety requirements will be necessary. It is highly recommended the I/O forcing is NOT used during field device maintenance.
Handling Module Faults
When the AADvance controller uses modules in a dual or triple redundant configuration, the controller can continue to operate if a fault occurs on one of its modules. However, when a module does have a fault it must be replaced as recommended in the Safety Manual (all modules permit live removal and replacement in redundant configurations) to make sure that faults do not accumulate and that multiple failure conditions do not cause a plant shutdown. On-site repair is not supported apart from for the replacement of fuses in some termination assemblies. All failed modules must be returned for repair or fault diagnosis in accordance with the warranty and return policy documentation delivered with your system.
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