CHAPTER 17 – Best Practices OMRON
Page 256 Release 2.0
Figure 2, Good grouping example
However in Figure (2) we see the PLC Programmer and SCADA developer have reorganised the
memory now there are only 3 blocks, which would be the same for up to 3000 memory addresses.
This is clearly far better than just 9 memory addresses with 9 communication requests. To achieve
this, design your application using the following rules:
1. Group together points that will be configured as “Always Update” in contiguous PLC
memory addresses
2. Group together points that will be configured as “Update when On Display”, grouping
for each page
3. Within groups from steps 1 & 2, create sub-groups for each required update rate
4. Within update rate sub-groups, sort and group data by data format (BCD, Float etc).
These points can be defined as 1 or more arrays.
Inte
e
BCD
Float
PLC Memory
} 1 sec
Inte
e
BCD
Float
} 5 sec
Inte
e
BCD
Float
} 1 sec
} Page 1
} Page n...
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