Error Messages For Loop And Analog Alarm Entries; Error Checks For Sf Statements - Siemens SIMATIC VPU200 Programming Manual

A.1 Types of Error Checking
A-2 Error Messages
When loops, analog alarms, and special function programs are entered, the
VPU200 checks for errors. Table A-1 lists the error messages that are given
when incorrect entries are made when programming loops and analog
alarms. The messages tell you why the entry is incorrect. Special Functions
Statements are also checked for illegal entries. Table A-2 gives you the types
of error checks made. When the VPU encounters one of these error types at
entry, the cursor returns to the field for correction of the error. The
guidelines given in this table will enable you to determine the correction you
should make; i.e., check variable type, range, etc., when an error is
indicated.
Table A-1 Error Messages for Loop and Analog Alarm Entries
An input must be entered at this field
Low must be less than high
Values must be within PV range
Values must be within PV span
Values must be within PV span
Low–low must be less than or equal to low
High must be less than or equal to high–high
Yellow must be less than or equal to orange
Address is out of range
No memory has been configured for the address type selected
Table A-2 Error Checks for SF Statements
Only certain classes of responses (integer or real constant, integer, real, or
discrete variable, yes or no, etc.) are allowed for certain parameters. (The
allowable responses are given in the tables in the Loop, Analog Alarm,
and Special Function Programming sections of this manual.)
A read-only variable (X, K, STW, WX, TCC, or LERR) may not be specified
as the output of an SF Statement.
The variable name (one to four characters) must be a valid name as
defined in the Loop, Analog Alarm, and Special Function Programming
sections of this manual.
The variable must be within range for its type, based on the memory
configuration for the P/C.
Certain variables may be accessed as integers only or as reals only. (This
information is given in the Loop, Analog Alarm, and Special Function
Programming sections of this manual.)
SIMATIC VPU200/565 Programming Manual