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Appendix B Frequently Asked Questions
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Appendix B
Frequently Asked Questions
This appendix lists some FAQs, and of course their answers
.
• What is the maximum limit of number of points?
For Machine Edition projects it is possible to create an application with up
to 500 user defined points. In theory each of these could be an array of
1024 elements totalling 512,000 addresses. For PLUS edition there is a
limit of 8000 user defined points, totalling over 8 million addresses if using
arrays !!
In practice the communications medium, number of active points and their
frequency of updates determine the maximum limit.
See "What is the maximum limit of communication updates?"
• What is the maximum limit of communication updates?
The charts below show the number of simultaneous reads per second
depending on each PLC and Network used. The maximum number of CX-
Supervisor points depends on the update rates and element sizes. For
example, 1000 reads per second could be 1000 points of 1 element, with
a 1 second update rate, or 200 array points with 5 elements with a 1
second update rate, or 20 array points with 5 elements with a 100
millisecond update rate, or any combination of variations.
The figures should be self-explanatory, but its worth noting that Toolbus is
better than twice as good as SYSMAC WAY at the same baud rate, and
depending on the PLC supports higher baud rates. This is a very cheap
way to improve performance.
Note 1: These figures assume best-case scenario, where data is in
contiguous addresses. Lesser performance will be achieved as memory
areas are fragmented.
Note 2: These tests stopped at 1000 updates so actual limits are beyond
this figure, except for CS1H Ethernet and Controller Link Networks, which
has been tested for 10,000 updates per second.