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Chapter 4: Programming the PLC
Table 4-3: Logic Inspector Field Definitions
Field Name
Description
OPER
Name of selected operator. This field cannot be edited; it is for reference purposes only.
ADDR
Register to associate with selected object. For control objects, ADDR would be the register of
the destination - the register to which this object's output is sent.
NAME
Text string (up to 20 characters) that describes, or names, the selected object. This field cannot
be left blank.
0/UNITS
Text string. For digital registers, this is the label to display during the 0 state. For analog
registers, this is the unit of measurement (e.g., Degrees, PSI, etc.)
1/SCALE
Text string. For digital registers, this is the label to display during 1 state. For analog registers,
this is the resolution, or minimum change to be reported. Enables you to set the number of
decimal places.
LOW ENG
Used with auto control objects. This is the low threshold, or control level, in engineering units.
LOW RAW
Used with auto control objects. This is the low threshold, or control level, in raw values.
HIGH ENG
Used with auto control objects. This is the high threshold, or control level, in engineering units.
HIGH RAW
Used with auto control objects. This is the high threshold, or control level, in raw values.
INITIAL
Float decimal. Value to which this operator should be set at startup.
LOG
Not used at this time.
LOCAL
Y or N. Enabling Local confines this object to the PLC; it isn't broadcast to the rest of HT3.
Disabling Local for objects that are only used in equations (are not "real" I/O) helps to conserve
disk space.
TYPE
Typical I/O type for the selected object. This is for informational purposes only; the field cannot
be edited.
S ELECTING AND M OVING
SELECTING AN OBJECT
Before an object can be manipulated or edited in any way, you must first select it. Selecting an object
is simply a matter of clicking it. When an object has been selected it is surrounded by a bright blue
line and the Message bar displays "[object name] selected."
SELECTING MULTIPLE OBJECTS
It is also possible to select multiple objects so that an action can be simultaneously performed on the
group. This is useful when you want to copy a group of objects to a new location or need to delete a
group of objects. Instead of selecting and copying/deleting each item, you select all the objects and
then perform the function.
To select a group of objects: click on any object in the group, then hold down the Shift key and click
on the second, third, fourth, etc. As you click on objects, the Message bar displays "1 objects
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