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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

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 149 150

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