HSLink Master
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2.5 Function Description
PCI-7851/7852 is equipped with one/two HSLink masters that control the
communication inside HSLink system. The purpose to communicate with
HSLink I/O modules is to gather input data from or set output value to them.
In order to doing that, each HSLink master manages a 2K byte SRAM on
7851/7852 boards to keep data.
In every polling cycle, master refreshes all input data from I/O modules and
set newest output data to I/O modules. The 2K SRAM keep these data, and
the software drivers mine I/O information for users.
Block Diagram
Figure 2.2 Block diagram of HSLink master
The Block Diagram a bove shows how HSLink communicates with user’s
AP or ISaGRAF. The SRAM act a buffer-like character.
