基本功能:数据缓冲:由于I/0设备的速率较低而CPU和内存的速率却很高，故在控制器中必须设置一缓冲器。在输出时，用此缓冲器暂存由主机高速传来的数据，然后才以I/O设备所具有的速率将缓冲器中的数据传送给I/O设备;在输入时，缓冲器则用于暂存从I/O设备送来的数据，待接收到一批数据后，再将缓冲器中的数据高速地传送给主机。差错控制:设备控制器还兼管对由I/O设备传送来的数据进行差错检测。若发现传送中出现了错误，通常是将差错检测码置位，并向CPU报告，于是CPU将本次传送来的数据作废，并重新进行一次传送。这样便可保证数据输入的正确性。数据交换:这是指实现CPU与控制器之间、控制器与设备之间的数据交换。对于前者，是通过数据总线，由CPU并行地把数据写入控制器，或从控制器中并行地读出数据;对于后者，是设备将数据输入到控制器，或从控制器传送给设备。为此，在控制器中须设置数据寄存器。
PPC322BE
Freelance 80OF系统由一个和多个机架式过程控制站或AC8OOF现场控制器组成，这些控制器可以通过1/O从站来进行扩展。您也可以选择配置控制站和AC80OF为冗余方式(CPU元余，现场总线冗余，1/0模块冗余)，或者非冗余方式。安装在导轨上的模块化的即插即用的/0模块可以根据您需要的类型和控制信号点数来与之相配。AC800F具有灵活的现场总线技术，可根据您的需求来选择:FOUNDATION Fieldbus，PROFIBUS或者HART。您可以连接相适应的现场1/O组件，如远程S800或S9001/O模块，或者通过现场总线模块直接将现场设备连接到AC80OF控制系统。
PPC322BE
Basic function: Data buffering: Due to the low speed of the I/O device and the high speed of the CPU and memory, a buffer must be set in the controller. When outputting, use this buffer to temporarily store the data transmitted by the host at high speed, and then transmit the data in the buffer to the I/O device at the rate that the I/O device has; At input, the buffer is used to temporarily store the data sent from the I/O device. After receiving a batch of data, the data in the buffer is high-speed transmitted to the host. Error control: The device controller also manages error detection of data transmitted by I/O devices. If an error is found during transmission, the error detection code is usually set and reported to the CPU, so the CPU discards the data transmitted this time and performs a new transmission. This ensures the correctness of data input. Data exchange: This refers to the implementation of data exchange between CPUs and controllers, as well as between controllers and devices. For the former, data is written to or read out from the controller in parallel by the CPU through the data bus; For the latter, the device inputs data to the controller or transfers it from the controller to the device. To achieve this, data registers must be set in the controller
PPC322BE
The Freelance 80OF system consists of one and multiple rack mounted process control stations or AC8OOF field controllers, which can be extended through 1/O slave stations. You can also choose to configure the control station and AC80OF as redundant mode (CPU redundancy, fieldbus redundancy, 1/0 module redundancy), or non redundant mode. The modular plug and play/0 module installed on the rail can be matched according to the type and number of control signal points you need. AC800F has flexible fieldbus technology, which can be selected according to your needs: FOUNDATION Fieldbus, PROFIBUS, or HART. You can connect suitable on-site 1/O components, such as remote S800 or S9001/O modules, or directly connect on-site devices to the AC80OF control system through a fieldbus module
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