PROFIBUS DP
5.1 CPU 41x-3 PN/DP as DP master / DP slave
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
5-27
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 S7-CPU as recipient
PROFIBUS
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).
Event detection
The following table shows you how the CPU 41x as recipient detects interruptions in data
transfer.
Table 5-19 Event detection of the 41x CPUs as recipients during direct communication
Event What happens in the recipient
Bus interruption (short-
circuit, connector
removed)
• 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)
To Next Page
Loading...
