Siemens 6DD1607-0AA2 - Error Class (ECL) and Error Code (ECO); Application Example - PROFIBUS DP Coupling

Configuring
Application Module FM 458-1 DP - User Manual 4-27
A5E01078222-02 Edition 03.2009
Bit 7, 8 of the header byte Significance
Bit 7, 8= 00 Device-related diagnostics
Bit 7, 8= 01 Identification-related diagnostics
Bit 7, 8= 10 Channel-related diagnostics
Table 4-8 Significance of bit 7 and bit 8 of the header byte
Bits 1 to 6 define the following:
 For device- and identification-related diagnostics the length of the
diagnostic block including the header byte, value range 2...63.
 For channel-related diagnostics, the identification number, value
range 0...63.
4.4.5.2 Error class (ECL) and error code (ECO)
Significance of the outputs ECL, ECO at function block @PRODP:
 Error class>0: An error is present. Function block @PRODP issues
a communications error (CF-LED on the FM 458-1 DP is bright)
These connections are hardly of significance for users as the appropriate
communication errors can be read-out through the diagnostics buffer. If
you contact the hotline with fatal/difficult faults/errors, then you will be
asked about the values at these connections.
4.4.6 Application example - PROFIBUS DP coupling
A project example (D7-FM_DP) is supplied with D7-SYS. which is
opened in the SIMATIC Manager under Open  Project example,
which includes a basic DP-configuration for the FM 458-1 DP.
Outputs ECL, ECO