系统分为两级:操作管理级和过程控制级。在操作管理级上不仅实现传统的控制系统监控操作功
能
(操作和显示，打印，趋势显示和报警)，而且还完成系统硬件诊测及不同系统间数据交换等功
能
。过程控制级实现包括复杂控制在内的各种回路调节(各种PID、比值、Simith 等)和高速逻辑控
制、顺序控制以及批量间歇控制功能。
过程控制站内部通讯(控制器与I/0 等各种智能设备或现场
仪表间)采用的是国际标准现场总
线。现场控制器支持Profibus等各种现场总线，Profibus 是目
前世界上应用最广泛的开放型现场总
线国际标准，分为FMS、DP 及PA三级，DP 通讯速率可高达
12Mb。而CAN (DIN/IS011898 标准)总线
最大特点是它的超级坚固性和数据安全性。系统当然也支
持Modbus。与智能现场仪表间的通讯则通过
IART协议或现场总线(31. 25Kb的ProfibusPA和FF总线
)。
操作管理级和过程控制级之间的系统通讯由Di giNetS网络(工业以太网/IEE802.3标准)实现，
用户可根据应用的实际情况选择通讯传输介质(普通电缆或光纤)和网络拓朴结构。
without a permanent connection to the system.
Freelance 800F Process Control Stage
At the process control level, the Freelance 800F system can be controlled by
It consists of a number of process control stations connected to I/O units. you can choose this
Some process stations are in redundant mode (CPU redundancy, fieldbus module redundancy
redundant) or non-redundant mode. Modular pluggable input/output modules
Blocks are freely selected and used according to the type and number of system process signals.
AC800F controller connects remote I/O or field device via fieldbus
ready.
system communication
Communication between operator level and process control level using TCP/IP
Protocol system bus (based on Ethernet), you can choose different
transmission medium such as AUI, twisted pair, fiber optic or coaxial cable.
Freelance OPC server for connecting to higher-level operators
station (800xA) or other OPC
