GE DS200PTBAG1B燃机工控
非循环数据通信DP-V1版的关键功能是非循环数据通讯的扩展功能。非循环数据通信主要用于配置和参数化目的。利用非循环DP-V1读写服务，主设备可以向从设备读写任何所需的数据。数据按时隙、索引和长度寻址。每个数据块最多可以有244个字节。DP-V1中的非循环通信：读取服务非循环数据的传输与循环数据通信并行执行，但优先级较低。非循环服务在DP-V0循环结束时的剩余时间内运行。CI854/CI854A的自动主计算确保PROFIBUS上的间隙足够大，可以进行一些非循环通信。如果需要增加一些额外的非循环通信的间隙，可以通过TTR时间来完成。
Acyclic Data Communication
The key feature of version DP-V1 is the extended function for acyclic data
communication. The acyclic data communication is mainly used for configuration
and parameterization purpose. With the acyclic DP-V1 read and write services the
master can read or write any desired data to and from the slave. The data is
addressed by slot, index and length. Each data block can be up to 244 bytes.Figure 3. Acyclic Communication in DP-V1: Read Service
The transmission of acyclic data is executed in parallel to the cyclic data
communication, but with lower priority. Acyclic services are operated in the
remaining time at the end of the DP-V0 cycle.
The automatic master calculation for CI854/CI854A ensures that the gap on
PROFIBUS is big enough for some acyclic communication. If there is a need to
increase the gap for some additional acyclic communication this can be done via the
TTR time.
