Siemens SIMATIC C7-613 Manual page 173

System Message
$ 016
Entry < lower limit value
$ 017
Value not permissible for
data type
$ 018
CPU is in RUN mode!
$ 019
Screen cannot be shown
C7-613 Control System
A5E00138934-03
Error Information for HMI FBs and System Messages
Cause
The input value is less
than the lower limit value.
The original value is
retained.
The entered value does
not match the data format.
The CPU is in RUN mode.
However, HMI functions
are not possible, since the
"HMI API" FB is not being
called.
The selected screen is a
standard screen.
Standard screens cannot
be selected by means of
the job interface or the
"HMI MENU" FB.
A special screen with the
selected name is not
available.
Remedy
Repeat the entry with a higher value.
Reenter the value using a value that is
permissible for the data format.
Check the configuration data of the variables.
Check your program. Ensure that the "FB HMI"
is called.
Check the number of the selected screen. The
permissible numbers for special screens are
found in Section 4.5.3
B-13