Percent Data - Omron CXONE-ALC-V4 - 10-2010 Operation Manual

Percent Data

5-5

Percent Data

In a CSV tag file, the scaling upper limit, scaling lower limit, and decimal point
position are stored for every tag ITEM. The scaling upper limit, scaling lower
limit, and decimal point position are, however, the default values registered by
the user in for individual tag names (i.e., function blocks) from the CX-Process
Tool. Therefore, for the same tag name (function block), the scaling upper
limit, scaling lower limit, decimal point position, and unit characters are all the
same for the tag ITEM, i.e., the engineering unit is the same.
For example, when the scaling upper limit value=500, scaling lower limit
value=0, and decimal point position=1 the values in the PLC or communica-
tions are scaled to the values shown in the following table.
Value in PLC or communications
−1,000 (−10%)
0 (0%)
5,000 (50%)
10,000 (100%)
11,000 (110%)
Scaling is based on the CSV tag file, according to the Integer Decimal setting
and Unit and Scale No. data for NS-series Numeral Display and Input objects.
The Integer Decimal is automatically set based on the decimal point position
in the CSV tag file.
Unit and Scale No. data items are created based on the scaling upper/lower
limit, and unit characters for tag names from the beginning of the CSV tag file.
Up to 66 sets of these items can be created for system version 2.0 and up to
207 can be created for system version 4.0 (632 if Segment Program 3 blocks
are set). When building, use the Unit Number Offset setting to specify which
of the Unit and Scale No. data items will be allocated. (System version 2 set-
ting range: 12 to 800, System version 4 setting range: 12 to 700, System ver-
sion 6.6 setting range: 12 to 700 (upper limit changes if Segment Program 3
blocks are set).
When the Tag ITEMs are required to display with the engineering units, the
units from the CSV tag file are used.
Note In NS project files built with the Face Plate Auto-Builder for NS, the following
two Unit and Scale settings are always registered: 0.01 multiplier, 0 offset,
and 0.1 multiplier, 0 offset.
Due to face plate design restrictions, when the decimal point position is 6 or
higher, only 5 decimal places will be displayed.
Data such as the MV for Basic PID is referred to as percent data, and is dis-
played using a base of 0.00% to 100.00%.
and used in the PLC or communications are 0 for 0%, and 10,000 for 100%
(e.g., the value for 50% is 5,000, and for −15% is −1,500).
When the values of tag ITEMs for percent data are displayed on the PT
screen or receive a set value, the values are displayed using two decimal
places and the percentage unit.
Value in device or communications
−1,000 (−10%)
0 (0%)
5,000 (50%)
Scaled value
−5.0
0.0
25.0
50.0
55.0
Display value
−10.00%
0.00%
50.00%
Section 5-5
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