CPU 31x-2 as DP Master/DP Slave and Direct Communication
2-33
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
2.8 Diagnosis with Direct Communication
Diagnostic Addresses
With direct communication you allocate a diagnostic address on the receiver:
PROFIBUS
CPU 31x-2 as ReceiverCPU 31x-2 as Sender
Diagnostic address
During configuration you define in the
receiver a diagnostic address that is
allocated to the sender.
The receiver receives information on the
status of the sender or on a bus
interruption via this diagnostic address
(see also Table 2-15).
Figure 2-11 Diagnostic address for receiver with direct communication
Event Detection
Table 2-15 shows how a CPU 31x-2 operating as receiver recognizes data
transmission errors.
Table 2-15 Event Detection by CPU 31x-2 Acting as Receiver in Direct Communication
Event
What Happens in the Receiver
Bus
interruption<FJ>(short-
circuit, plug
disconnected)
OB 86 is called and a station failure reported
(incoming event; diagnostic address of the receiver, assigned
to the sender)
on peripheral access: Call of OB 122 <FJ>(Peripheral access
error)
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