Festo CP-FB13-E Programming And Diagnostics Manual page 86

3. Diagnosis
3-10
Busy bit
During device-related diagnosis 1, the CP system supplies
status information as bit 1:
– Busy Bit = CP system in starting phase and therefore not
ready for data exchange
If the busy bit is set (= "log. 1"), the diagnostic bits in bytes
2...5 contain "logical 0". Only device-related diagnosis 1 is
supported.
Diagnostic possibilities
The CP system offers extensive diagnostic possibilities via the
PROFIBUS-DP. The diagram below shows the steps which are
important for diagnosing the CP system. Only those diagnos-
tic bits, which require a further diagnostic step, are repre-
sented.
7 6 5 4 3 2 1
1
Device-related
diagnosis 1 is sensible
7 6 5 4 3 2 1
Device-related
diagnoses 2...5 are sensible
Fig. 3/2: Diagnostic steps
0 Bit
Station status 1
0
Bit
1
Device-related diagnosis 1
Festo P.BE-CP-FB13-E-EN en 0112e