Hitachi S10Mini SV.Link, Hardware Manual, Page: 53 / 75

4 USER GUIDE
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4.12 Limitations
The following limitations are imposed on the use of SV.LINK:
(1) Simultaneous use of SV.LINK and ET.NET modules
When mounting the SV.LINK module and ET.NET module on the same mount base, perform
setup so that the main module and submodule are distinctively defined. If both of them are
defined as main modules or submodules, they do not normally operate because the CPU cannot
distinguish between ET.NET and SV.LINK.
Example: When the ET.NET module is defined as the main module, be sure to define the
SV.LINK module as the submodule. When it is defined as the submodule, be sure to
define the SV.LINK module as the main module.
Also, note that no more than two modules (ET.NET and SV.LINK modules) can be mounted on
the same mount base.
You should also keep in mind that only one SV.LINK module can be mounted even if no
ET.NET module is mounted.
(2) Use of a dedicated line
If the line is highly loaded, the communication cycle may extend, adversely affecting the
equipment operations. To avoid such a problem, ensure that the physical line between the
S10mini and MELSEC is exclusively used for high-speed I/O communications. Do not
connect this physical line to a device other than the S10mini or MELSEC. When using two
high-speed I/O communication channels, provide a physical line for each channel.
(3) I/O data consistency guarantee unit
Owing to hardware limitations, I/O data consistency is guaranteed on an individual word basis.
The contents of numeric data longer than a longword cannot be guaranteed. Therefore, do not
exchange data longer than a longword with the MELSEC.
(4) Communication response wait time and communication delay time
Although the communication response wait time and communication delay time settings are both
variable in 1-ms units, the actual settings are determined by disregarding digits below 10 due to
SV.LINK internal timer limitations. When the selected value is between 1 and 9 ms, however,
the following special rules apply to the operation:
Communication response wait time: The digits below 10 are disregarded so that the operation is
performed at a wait time setting of 0 ms.
Communication delay time: The operation is performed at a setting of 10 ms.