点击图片查看原图
对一台工业网关而言，处理能力是非常重要的，因为它支持各种工业以太网接口，无论是作为主站或从站，都能处理多个连接。当作为从站，管理人员可通过网关同时获取多个主站发来的数据信息；而作为主站，网关又必须连接多台从站设备，并且保证设备之间的正常通讯。若要处理一个广域网连接，网关必须具备足够的处理能力来支持多个连接，同时在一个预设的时间范围内处理所有请求，而不影响响应时间。
有些网关只使用16 位元处理器，这样会限制网关在设备支持和响应时间上的能力。而具备更高处理能力的网关可以同时支持多台设备，但并不影响响应时间和数据传输的可靠性。这就是为什么某些网关最多可支持16 个接入连接，而某些网关只能提供8 个连接。
智能机制
除处理能力外，网关还必须支持智能机制，可优先传送紧急请求，并确保可以得到尽快处理。请求优先级的判断可通过Modbus TCP 命令功能代码、slave ID 或IP 地址/TCP 端口进行判断。当一个网络连接中有不同设备发出多个请求时，网关可设定过滤特定的Modbus TCP 命令作为紧急命令，并将其发送到队列前面，就好像是一个紧急的“暂停”命令来停止驱动一样。管理人员还可以指定某特定slave ID 的优先级别最高，因为该设备发出的重要I/O 信号可能会关联到整个系统的安全性。
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