Diagnostics In Direct Data Exchange - Siemens SIMATIC S7-400 Manual

5.1.8.2

Diagnostics in direct data exchange

Diagnostic addresses
In direct data exchange you assign a diagnostic address in the recipient:
Table 5-18 Diagnostic address for the recipient during direct data exchange
S7-CPU as sender
Event detection
The following table shows you how the CPU 41x as recipient detects interruptions in data
transfer.
Table 5-19
Event
Bus interruption (short-
circuit, connector
removed)
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
PROFIBUS
Event detection of the 41x CPUs as recipients during direct communication
What happens in the recipient
5.1 CPU 41x-3 PN/DP as DP master / DP slave
S7-CPU as recipient
Diagnostic address
During configuration you specify a diagnostic address in the
recipient that is assigned to the sender.
By means of this diagnostic address, the recipient obtains
information on the status of the sender or a bus interruption
(see also following table).
OB86 is called with the station failure message (event
•
entering state; diagnostic address of the recipient
assigned to the sender)
In the case of I/O access: OB122 called (I/O access
•
error)
PROFIBUS DP
5-27