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13 Programmable Logic Controller (PLC)
Equation Status
The PlcEquationsStatus feature displays the first of any errors that occur as the video interface processes
the Boolean equations. The status appears if errors occur after you click the PlcEquationApply button.
If no errors occur, the status displays
OK
.
The following table provides descriptions of the possible equation errors displayed in the
PlcEquationsStatus box.
Table 2: Equation Error Status Descriptions
Equation Error Status Description
LUT now out of sync with PlcEquations:
PlcEquationApply required The equations have been updated and are no longer
synchronized with the LUT contents.
You must click PlcEquationApply to fix this error.
PlcEquation <equation number>: identifier too large at
column <column number The identifier used for the equation, identified in the
error message by number, is too large
PlcEquation <equation number>: Undefined identifier
<string> at column <column number The equation does not include a valid signal name
PlcEquation <equation number>: Output signal is
already assigned The equation at that location is attempting to use an
output that has already been assigned a value
PlcEquation<equation number>: = expected at column
<column number The equation at that location is missing an “=”
PlcEquation <equation number>: Number of expression
elements exceeds maximum number of <element limit> The equation at that location contains too many
expression elements. You need to simplify the
expression.
Too many input variables in use at PlcEquation
<equation number Number of LUT input variables exceeds maximum
possible LUT inputs
PlcEquation <equation number>: expression too
complicated for PLC The equation at that location is too complicated to be
evaluated. You need to simplify the expression.
PlcEquation <equation number>: illegal expression The equation at that location does not have valid syntax
PlcEquation <equation number>: No matching ( " The equation at that location is missing a “(“
PlcEquation <equation number>: Unmatched (at
column <column number> The equation is missing a “)” to match the “(“ at that
location