Online Status Indicators; Watch Window - Control Techniques Epsilon EP-P Reference Manual

Problem/Message
The mix of variable or
expressions types can not
be compared(=)
The mix of variable or
expression types can not be
multiplied or divided
The Source Event-
<variable name> can only
be assigned <max number>
The Selection variable can
only be assigned a
Selection value
This instance does not exist
This is not a fully qualified
This variable cannot be
assigned a selection value
This variable type cannot be
assigned a value
The selection is not valid for
Trying to assign a selection
variable with bad selection
7.4

Online Status Indicators

7.4.1

Watch Window

PowerTools Pro contains a diagnostic utility called the Watch Window. The Watch Window can be used while PowerTools Pro is running and
the PC is online with the device. The Watch Window allows the user to monitor the status of all the desired system parameters in one location.
200
This message occurs in conditional
Expressions (i.e. If then). Variables are
type identified, so equation and
assignments (x = 9) can be verified. In
an expression numerical, Boolean and
event values can be compared for
equality conditions. Selections and text
This message occurs in equations.
Variables are type identified, so equation
and assignments (x = 9) can be verified.
In an equation only numerical values can
be multiplied or divided. Booleans,
Selections, text and events can not be
The limits to Source Event assignments
are the number of destinations assigned
to a single Output event is limited.
Generally this is three. For Selections it
is one. The Waitfor Instruction
times temporarily assigns its Output Event
Operands. This is subject to the
The destination variable only accepts
selection values. Selection values are
fixed unquoted text. The selection text
must exactly match the available
selections of the Destination variable.
This variable is referencing an instance
that has not been created in your
application. For example "Index.9.vel"
the instance 9 of index has not been
To use a variable it must be fully defined.
Some variables are global variables and
only the name is defined. Other
Variables require a name.name
variable convention. Other variables require an
instance number (index.1.vel). All the
components identifying the variable
must be available to qualify the variable.
The variable that you are attempting to
define with a selection does not accept
The Variable is of a type that does not
accept any assignments. A Source
Event variable is an example. You can
not assign a value to an output event.
The variable that you are attempting to
define with a selection does accept
selection values. However the selection
this variable
you are attempting to use is not
When checking to see if the selection
goes with the destination variable, the
source is not a defined selection for the
data
www.controltechniques.com
Cause
can not be used.
compared.
assignment limitations.
defined.
selection values.
accepted by this variable.
destination variable.
Solution
To use an Output Event in a Waitfor
instruction, there must be at least one free
assignment.
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