Siemens CP 243-2 User Manual

Signaling Errors and Diagnostics in the User Program

4-3

SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02

The following example in STL applies to a CPU 222 with a CP 243-2 plugged in
directly beside it:

If an AS-i configuration error occurs in the protected mode, the CP 243-2  sets bits
SM 9.0 and SM 11.0 (both bits provide the user with the same information: AS-i
configuration errors).

To obtain more detailed information (which slave has failed), you can read in the
delta list via bank 1 of the analog input area (see Section 2.5.1).

Table 4-1

 

NETWORK 1
LD     SM0.1

//If: bit “First Scan”:

SI     Q1.7, 1

//PLC_RUN = 1

RI     Q1.0, 6

//Select bank 0

LD     I1.1

//If: CP_READY

CALL   2

//Then: AS-i diagnostics

NETWORK 1

//Read delta list

LD     SM0.0

//Always 1

=I     Q1.0

//Select bank 1

BMW    AIW0, VW316, 4

//Read delta list

NOT
=I     Q1.0

//Select bank 0

//Below, there are several accesses to the delta list:
LD     V316.1

//If slave 1 has failed

O      V319.7

//Or if slave 31 has failed

=      Q0.0

//Then CPU output bit = 1