Omron CS1W-LC001 Operation Manual page 35

Outline
Example 1
Example 2
Note 1
Note 2
Note 3
 Likewise, data exchange with the CPU Unit is handled not in engineering
units but in percentage units. Values in I/O memory words are converted to
percentage units based upon the specified range before they are input to
the Loop Control Unit. Alternatively, percentage values are converted to
Hex values based upon the specified range before they are output to CPU
Unit I/O memory.
At input from the CPU Unit, the values of 0000 to 0FA0 Hex in the I/O
memory words are converted to 0.00 to 100.00% before they are input to the
Loop Control Unit when the range 0 to 4000 (0000 to 0FA0 Hex) is specified.
At output to the CPU Unit, the values of 0.00 to 100.00% are converted to
0000 to 0FA0 Hex before they are output to the Control Unit when the range
0 to 4000 (0000 to 0FA0 Hex) is specified.
In data exchange with the CPU Unit, data can be actually exchanged within
the range -320.00 to +320.00% and not within the range 0.00 to 100.00%.
So, in the above example, the conversion range for 0 to 4000 (0000 to 0FA0
Hex) is 0.00 to +100.00. However, in actual operation, 8300 to FFFF Hex and
0000 to 7D00 Hex are converted to -320.00 to -0.01 and 0.00 to +320.00%,
respectively, before they are processed.
Any data range in CPU Unit I/O memory corresponding to 0 to 100% on the
Loop Control Unit can be specified. (The data range is dependent on the
specified input range and output range on the CPU Unit Terminal block or the
Expanded CPU Unit Terminal block.)
CX-Process Tool scales these percentage values to engineering units
values, and CX-Process Monitor monitors and sets the values in engineering
units. (For details, see 3-1 Configuration of Function Blocks.)
The Loop Control Unit does not process analog data in engineering units
(scaled values). (All analog data is processed in percentage values.) To
monitor/and set analog data in engineering units, the analog data must be
scaled on CX-Process Tool and then monitored and set on CX-Process
Monitor.
Section 1-1
15