Mitsubishi Electric MELIPC MI5000 Series, Руководство пользователя

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7 CC-Link IE Field Network Basic FUNCTION
7.1 Cyclic Transmission
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Group number setting
This function divides slave stations into groups by setting a group number to each slave station and each of groups performs
cyclic transmission.
By separating slave stations with a shorter response processing time and slave stations with a longer response processing
time into groups, the differences of the standard response times of each slave station does not affect the cyclic transmission.
Group number setting
Group numbers are set in "Network Configuration Settings" of "CC-Link IEF Basic Setting". (
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Page 177 Network
Configuration Settings)
How to organize groups
Consider the following when organizing groups.
■ Dividing slave stations into groups
• Organizing two or more groups can configure a network with slave stations that occupy 17 or more stations in total.
• Organizing slave stations into groups with similar standard response times reduces the effect of differences of the standard
response times of slave stations. For the standard response times, check the manual of the slaves station to be used.
Because link scan times differ by group, slave stations with the longest standard response time of the groups are affected.
(
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Page 77 Cyclic transmission data flow)
■
Merging slave stations into one group
• To perform operation among slave stations in cooperation, merge them into the same group.
• When the line load is large, merging slave stations into the fewest number of groups as possible according to the number of
slave stations connected to the master station is recommended. For example, merge slave stations into one group if the
slave stations are 16 or less. When two or more groups are organized, the master station sends requests to each of them.
Since the packets of the cyclic transmissions performed for each group are sent on the line, the more groups are organized,
the larger the line load becomes.
(1) The total number of occupied stations for one group is 16 maximum.
(2) Slave stations can be divided into up to four groups.
(1)
(2)