FBM208-P0914TB 单输入/单输出 提供了一个检测输出通道故障的回读功能

FBM208-P0914TB具有高可用性要求的单输入/单输出控制方案可以利用FBM208作为冗余对的优势。提供了一个检测输出通道故障的回读功能。在维修情况下，当更换单个模块时，输入和输出由冗余模块维护。HART信号与4-20 mA信号电气兼容，允许工厂升级现场设备而无需更改控制系统。FBM208-P0914TB提供相同的功能，用于从旧的fbm05升级。

一对冗余的模块组合在FieldbusModule (FBM)级别提供冗余，将字段I/0连接到一个公共终端组件。每个模块独立地尝试将输出保持在其指定的输出值，并且每个模块独立地报告其观察到的输入值

Foxboro DCSControl软件中的冗余模拟输入和冗余模拟输出块与来自模块的信息一起验证每个输入和输出。

FBM208与标准HART信号在电气上兼容。

4个0 ~ 20ma直流模拟输入通道

4个0至20 mA直流模拟输出通道，带回读

比较FBM的输出值和当前的回读值。如果readback值与期望的输出相差超过+ 2%，则FBM将其输出通道标记为BAD

监控FBM内部通道电流环路功率，并标记通道BADif功率小于16v dc

将通道标记为坏会导致冗余模块中相应的通道继续驱动输出

冗余模块提高可靠性

终端组件(TAs)用于本地或远程连接现场布线到fbm208

FBM将其输出值与当前的回读值进行比较。如果readback值与期望的输出相差超过+2%，则FBM将其输出通道标记为BAD。此外，如果输出值比期望输出值大于+2%，则该通道的电源将被关闭，以帮助防止不良通道干扰冗余伙伴FBM对该通道的控制。故障通道的电源保持关闭状态，直到FBM被用户替换或重新启动。

当FBM的输出通道被标记为BAD时，CP将该信息呈现给Foxboro DCS，作为系统管理报警消息和控制块报警显示。

FBM208-P0914TB 单输入/单输出 提供了一个检测输出通道故障的回读功能

Fbm208-p0914tb Single input/single output control solutions with high availability requirements can take advantage of the FBM208 as a redundant pair. Provides a read-back function to detect output channel faults. In the case of maintenance, the inputs and outputs are maintained by redundant modules when a single module is replaced. HART signals are electrically compatible with 4-20 mA signals, allowing factories to upgrade field equipment without changing control systems. The FBM208-P0914TB provides the same functionality and is used to upgrade from an older fbm05.

A combination of redundant modules provides redundancy at the FieldbusModule (FBM) level, connecting the field I/0 to a common terminal component. Each module independently attempts to keep the output at its specified output value, and each module independently reports the input values it observes

Redundant analog inputs and redundant analog output blocks in the Foxboro DCSControl software verify each input and output together with information from the module.

The FBM208 is electrically compatible with standard HART signals.

Four 0 to 20ma DC analog input channels

4 0 to 20 mA DC analog output channels for back reading

Compare the output value of FBM with the current read-back value. If the readback value differs from the desired output by more than + 2%, FBM marks its output channel as BAD

Monitor the internal channel current loop power of the FBM and mark the channel BADif power less than 16v dc

Marking a channel as bad causes the corresponding channel in the redundant module to continue driving output

Redundant modules improve reliability

The Terminal Component (TAs) is used to connect field cabling to the fbm208 locally or remotely

FBM compares its output value with the current read-back value. If the readback value differs from the desired output by more than +2%, FBM marks its output channel as BAD. In addition, if the output value is greater than +2% of the desired output value, the power to the channel is turned off to help prevent the bad channel from interfering with the redundant partner FBM's control of the channel. The power supply to the faulty channel remains off until the FBM is replaced or restarted by the user.

When the output channel of the FBM is marked BAD, CP presents this information to the Foxboro DCS for display as a system management alarm message and control block alarm.