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Reference Manual
00809-0100-4696, Rev AA
September 2004
Rosemount 848L
D-4
ERROR HANDLING The syntax of the entered equation is parsed when the target mode transitions
from OOS to AUTO. Each equation is checked in order, and when an error is
encountered in an equation, the parsing is suspended for the remaining
equations, and the target mode is set back to OOS. The equation where the
problem was encountered is indicated along with a message as shown in the
table below.
Bounds checking on the values of parameters used in the functions are
checked during run-time when ACTUAL MODE is AUTO. Errors of this type
will be indicated by a bad status in the equations computed value.
TON 2 2 TON (a, time);
This function is an on delay. When 'a' is false, this
function will set its' output to false. When 'a' transitions
to true, the function's output will remain false for 'time' *
100 milliseconds before going true.
10
TP 2 2 TP (a, time);
This function is a pulse timer. When 'a' transitions to
true, this function will set its' output to true for 'time' *
100 milliseconds, and then return false.
10
XOR 2 10 XOR(a, b,...);
This function is false if all parameters are in the same
state, either all true or all false. Otherwise the function
is true.
NO LIMIT
Table D-1. Supported Functions
Function Name
Required number
of parameters
Maximum number
of parameters
Function Description
Maximum
Instances
Table D-2. Error Handling
Conditions Status response
No semi-colon appears in the equation. Missing semi-colon.
More left parenthesis than right parenthesis. Un-matched (.
More right parenthesis than left parenthesis. Un-matched ).
A comma placed without a preceding function parameter. Badly placed comma.
Open and Closed parenthesis without a parameter or
statement contained.
Empty ().
A semicolon is contained prior to finishing an expression. Badly placed semicolon.
A function call is missing one or more parameters. Too few parameters in function.
A bad character is present, or a parameter appears outside
of a function call.
Syntax error.
An unknown function is called out. Unknown function.
An opening parenthesis is located after the closing
parenthesis of a function call.
Badly placed (.
A function call contains too many parameters. Too many parameters in
function.
A decimal number was found where an integer was
expected.
Invalid number.
A function result was used as a function parameter where a
literal integer number was expected.
Invalid parameters in function.
A function has been used more than the maximum allowed
instances.
Insufficient resources.
All equations were parsed successfully. Equation completed.