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Configuration of Instrumentation System
Section
1-2
32
Note 1
In addition to the above number of points, the CPU Unit Terminal block differs
from the Expanded CPU Unit block as follows:
With the CPU Unit Terminal block, analog output to another function block
must go via the Variable ITEM Setting block (Block Model 172). Whereas,
with the Expanded CPU Unit Terminal block, analog output can be output
directly without going via the Variable ITEM Setting block (Block Model 172).
Also, with the CPU Unit Terminal block, analog input/output to and from
another function block is possible from only either "analog input" or "analog
output" type ITEMs. Whereas, with the Extended CPU Unit Terminal block,
input/output is also possible from all ITEMs (mainly parameter ITEMs) that
can be written by the Variable ITEM Setting block (Block Model 172) in
addition to the above ITEMs for the CPU Unit Terminal block.
Note 2
In data exchange above, the AI Terminal from CPU Unit block or Expanded
AI Terminal from CPU Unit treats data in the words as decimal data, and
specifies which values are to be converted to 0% and 100% values for any
specified range. For example, when the range 0 to 4000 (0000 to 0FA0
Hex) is specified for input from the CPU Unit, the AI Terminal from CPU
Unit block converts the values of 0000 to 0FA0 Hex in I/O memory words to
0.00 to 100.00% before inputting them to the Loop Control Unit.
Alternatively, the AO Terminal to CPU Unit block or AO Terminal to
Expanded CPU Unit can specify the target conversion values (decimal) at
0% and 100%. When the range 0 to 4000 (0000 to 0FA0 Hex) is specified
for output to the CPU Unit, the AO Terminal to CPU Unit block converts the
values of 0.00 to 100.00% to 0000 to 0FA0 Hex before outputting them to
the I/O memory words.
These percentage unit values are scaled to engineering units values by
CX-Process Monitor.
When the CPU Unit Terminals or the Expanded CPU Unit Terminals are
used to exchange Analog I/O Unit allocated CIO converted values and
setting values, data exchange functionally differs with data exchange using
the Field Terminal blocks as follows:
Item
When field terminal blocks are used
When CPU Unit Terminals or
the Expanded CPU Unit
Terminal block are used
Address specification
The I/O memory address need not be
specified. (Set only the unit number.)
I/O memory address must be
specified.
Range conversion
At which values (for example, 0000 to 0FA0
Hex) the 0 to 100% values are stored to the
allocated area by the Analog I/O Unit need
not be set as the "range."
(This, however, is required on isolated-type
Analog I/O Units.)
At which values (for example,
0000 to 0FA0 Hex) the 0 to
100% values are stored to the
allocated area by the Analog
I/O Unit must be set as the
"range."
Value of allocated
relay area
Analog input
The 1st word of the allocated relay area is
forcibly set by the Loop Control Unit. As a
result, the peak hold function is disabled.
Regular use
Analog output The 1st word of the allocated relay area is
forcibly set by the Loop Control Unit. As a
result, the Analog Output Conversion Enable
flag is always "1" (output after conversion
ON). When the mode is changed to the
PROGRAM mode, the hold output function
does not work.
Regular use
When the mode is changed to
the PROGRAM mode, the hold
output function works when the
Analog Output Conversion
Enable flag turns OFF.