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AS-Interface
Appendix: Example for startup on a Siemens S7
Subject to reasonable modifications due to technical advances.
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12.2.4.3
Hex parameterizing
DPV1_Status
Hexadecimal representation of the data resulting from the settings for parameter
bytes 0 to 2.
User_Prm_Data
Hexadecimal representation of the data resulting from the settings for parameter
bytes 3 to 37.
12.2.5
SIMATIC StepS7 blocks
After the hardware has been configured, these can be sent to the CPU. Since data
transmission of the AS-i data is done in this example directly to the process image,
no additional Step7 program is needed for data refreshing. Therefore there is no
program code in OB1.
OB1
Cyclical program block Access to the AS-i data is via the parameterized
address space in the in-/outputs process image.
OB82
PROFIBUS diagnostic alarm. This OB is invoked as soon as a PROFI-
BUS slave has set the ExtDiag flag in the telegram reply. This ExtDiag
flag allows a PROFIBUS slave to report an error condition to a PROFI-
BUS master. If OB82 is not present, the CPU is stopped when a PROFI-
BUS slave sets the ExtDiag flag.
OB86
PROFIBUS peripheral error. This OB is invoked when the PROFIBUS
master detects a PROFIBUS slave failure.
OB100
Startup OB. This OB is run once when the CPU starts up.