CPU 31x-2 as DP Master/DP Slave and Direct Communication
2-26
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Station Status 2
Table 2-11 Structure of Station Status 2 (Byte 1)
Bit Meaning
0 1: New parameter assignment and configuration of the DP Slave is
required.
1 1: A diagnostic message has arrived. The DP slave cannot continue
operation until the error has been rectified (static diagnostic message).
2 1: This bit is always “1” when there is a DP slave with this DP address.
3 1: The watchdog monitor has been activated for this DP slave.
4 0: This bit is always “0”.
5 0: This bit is always “0”.
6 0: This bit is always “0”.
7 1: DP slave is deactivated, that is to say, it has been removed from the
scan cycle.
Station Status 3
Table 2-12 Structure of Station Status 3 (Byte 2)
Bit Description
0
to
6
0: These bits are always “0”.
7 1: More diagnostic messages have arrived than the DP slave can
buffer.
The DP master cannot enter all the diagnostic messages sent by the
DP slave in its diagnostic buffer.
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