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13.19 Bar Graph
The Bar Graph displays PLC register data as a bar graph in
proportion to its value as defined by the SPAN and ZERO settings.
Procedure to place a Bar Graph
1. Click the Bar Graph Tool or select
Bar Graph
from the
Parts
menu.
2. Fill in
General
Tab Items:
Description
: A reference name (not displayed) that you
assign to the Bar Graph.
Read Address
: First Word of 3 possible that are used to
control the Bar Graph display.
Device type
is the word prefix.
Device address
is the word number.
Data format:
Defines data from the controller as
binary (
BIN
) or binary coded decimal (
BCD
).
See Word Lamp 13.2 for format description.
No. of words
: Restricted to 1 or 3. Three words are
needed when variable alarm is selected. The Bar
Graph continuously retrieves 3 data words, one
for data and one each for high and low alarm
limits. One word is needed when fixed alarms are
selected.
Tag
is used to select the Read address from a list of
predefined Tags.
Aux.
directs the Read address to be retrieved from the Auxiliary Port.
3. Fill in
Shape
Tab Items. Bitmaps with transparent portions can be used to make irregular bargraphs such as tanks with cut
away views.
4. Go to
Bar Graph
Tab and make settings.
Attribute:
Direction
: Up, Down, Left and Right. Select the direction
for the bargraph to travel.
Variable alarm
:
Yes:
The high and low alarm limits are retrieved from
PLC data registers as described below.
No:
The high and low alarm limits are set in the “Value”
fields.
Variable Alarm
YES
NO
Read Address
Bar graph data
Bar graph data
Read 1
Low alarm
--
Read 2
High alarm
--
Summary of Contents for MMI-1500
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