Group Number Setting - Mitsubishi Electric CC-Link IE Basic Reference Manual

Group number setting

This function divides slave stations into groups by setting a group number to each slave station and each of groups performs
the cyclic transmission.
By organizing groups separating slave stations with shorter response processing time from ones with longer response
processing time, the differences of the reference response times of each slave station does not badly affect the cyclic
transmission.
(1)
(2)
(1)The total number of occupied stations for one group is 16 maximum.
(2)Up to four groups can be organized.
Before using the group number setting, check the versions of the CPU module and the engineering tool. (
Page 58 Added and Enhanced Functions)
Note, however, there is no restriction for the R00CPU, R01CPU, and R02CPU.
How to organize groups
Organize groups considering the following.
■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.
• By dividing slave stations into groups with similar reference response time, the gap of the response time of each slave
station does not badly affect the cyclic transmission. For details on the reference response time, refer to manuals for slave
stations used. Link scan times vary from group to group. The link scan time of each group is affected by a slave station that
has the longest reference response time in a group. ( Page 31 Data flow of cyclic transmission)
■Merging slave stations into one group
• To perform cooperating operation between slave stations, 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 flow on the line, the more groups are organized, the
larger the line load becomes.
7 FUNCTIONS
30
7.1 Cyclic Transmission
Group No.1
Group No.2