Siemens SIMATIC NET CP 243-2, Manual

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Signaling Errors and Diagnostics in the User Program
4-3
SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02
4.2 Example: Reading the Delta List
STL Example
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
OB1 (STL)
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
SBR 2 (STL)
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