Siemens SIMATIC CP 440 Manual page 131

Calling the SFCERR Variable
You can obtain more information on errors 14 (1E0EH) and 15 (1E0FH) in event
class 30 by means of the SFCERR variable.
You can load the SFCERR variable from the instance DB belonging to the
corresponding function block.
The error messages entered in the SFCERR variable are described in the System
Software for S7 300/400, System and Standard Functions reference manual in
Section 2.1 "Common Parameters for SFCs" and in the information on the system
functions SFC 58 "WR_REC" and SFC 59 "RD_REC".
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Diagnostics with the CP 440
8-13