HSLink Introduction
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3
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Modular design of slave I/O
All kinds of slave I/O module are mechanically of the same size and follow
the identical connecting PIN assignment. To fit into various wiring situations
to keep flexibility, the HSLink Terminal Base is introduced. HSLink TB acts
as an carrier of salve I/O module with wiring function. The Ethernet
connector and screw terminal on HSLink TB makes it easier for users to
replace I/O module without power off and wire off when necessary.
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Easy to program
Every HSLink master card is equipped with 4K SRAM, and it is the 4K SRAM
that carries all the I/O status information of this HSLink system. The ASIC on
every HSLink master card takes charge of communication with all remote
slave I/O modules at constant scanning period and keeps the most updated
I/O status information in the SRAM. What users do is to read and write
through PCI bus the data in the 4K SRAM on HSLink master card. So, no
protocol is needed.
1.1.3
Application of HSLink
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HSLink as Distributed PLC
First we review the evolution history of distributed PLC:
In the past decades, PLC had token an important character in the field of
industry automation. With the help of communication modules, such as
RS232, RS485, PLC could also perform distributed control. The traditional
architecture of distributed PLC application is showed at Figure 1.2, in which
the MPC take the character of medium for data transmission from field to
MIS.
Figure 1.2: Tradition architecture of distributed PLC
MPC
MPC
PLC
PLC
PLC
PLC
PLC
RS485
RS232
RS232
Network
