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Chapter 6 Communication mode
6.6
Simple data link mode
Simple data link function is established by EH-SIO as a host by sending task codes "Read I/O (series N points) (A0)"
and "Write I/O (series N points) (A2)" to other PLC.
The functionality is similar with CPU LINK function, but the data refresh cycle is little bit longer than CPU LINK
function because of using serial communication. Advantage is simple data link system can be easily made without
other special module required than EH-SIO.
The physical layer of simple data link is RS-422, the protocol is Hi-Protocol (Communication procedure 2) is used.
The PLCs (EHV series / MICRO-EHV series / EH-CPU316A / 516 / 548, MICRO-EH series) which have these
functionality can be connected. Since the link system is handled only by master (EH-SIO), no other setting is
necessary on slave PLCs than communication parameter configuration.
« Note »
If simple data link mode is configured, port 1 does not work.
In case that initial setting for port 1 has been completed, simple data link mode cannot be configured
on port 2.
Do not use to mix devices with different communication protocols in the simple data link network.
request
request
response
response
No need user project
Figure 6.61 Simple data link mode basic operation
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