7
1–2 System Configuration
Depending on your control requirements, you can combine various Units for
a total number of I/O points ranging anywhere from 20 to 148.
For example, a single C20K CPU, with no Expansion I/O Units connected,
has a total of 20 I/O points, broken down into 12 input points and 8 output
points. If it is used in combination with a C4K Input Unit, there will be a total
of 16 input points and 8 output points. If combined with a C4K Output Unit,
the total will be 12 input points and 12 output points.
If the C20K is combined with a C16P Expansion I/O Unit, there will be a sum
total of 36 I/O points. If the C16P is an Input Unit, they will be broken down
into 28 input points and 8 output points; if it is an Output Unit, there will be 12
input points and 24 output points. For a listing of possible Unit combinations
and numbers of I/O points, see Appendix E System Configuration Chart.
Only one Expansion I/O Unit with the suffix ”P” can be connected to any
given CPU. It is possible to add more than one C4K, but under no circum-
stances can the total number of I/O points exceed 148. Either one Analog
Timer Unit or one I/O Link Unit can be added to any other possible combina-
tion of Units.
When determining which configuration to use, another factor to consider is
the ease with which I/O points can be assigned. In order to make the process
as simple as possible, it is recommended that a CPU be used which has
more I/O points than the largest Expansion I/O Unit. For example, rather than
combining a C20P CPU with a C20P Expansion I/O Unit, it would be prefer-
able to use a C40P CPU. Similarly, combining a C60P CPU with a C40 Ex-
pansion I/O Unit would be better than using a C40P CPU and a C60P Expan-
sion I/O Unit.
This is intended only as a brief overview of system configuration possibilities.
In addition to Appendix E System Configuration Chart (mentioned above),
see the I/O tables in the operation manual for details on various possible
combinations of Units and the particular I/O bits and IR area work bits which
are available for use in each configuration.
System Configuration Section 1–2
To Next Page
Loading...
Need help?
General
