IFM Ecomat 300 AC1355, Supplementary Device Manual

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Additional functions
AS-i diagnosis via Profibus DP
12-1
12 Additional functions
12.1 AS-i diagnosis via Profibus DP
12.1.1 Digital inputs
The AS-i master status information in the first byte of the digital input data of the single/A slaves
contains master flags of the corresponding AS-i system:
Byte 0 Bit 7 Bit 5 Bit 5 Bit 4
PLC running in
the controllere
configuration error
in the AS-i circuit
no AS-i slave
detected
periphery faults
12.1.2 Digital outputs
The AS-i master control information in the first byte of the digital output data of the single/A slaves
controls the stored diagnostic information:
Byte 0 Bit 7 Bit 5 Bit 5 Bit 4
reserved reserved
reset of the stored
diagnostic data
activate transfer of
the stored diagnostic
data
If the bits 4 and 5 of the control information (byte 37) are set to 0 (default), the extended diagnosis
contains the current system states. If short-time faults are to be detected as well, the controllere can
be prompted via bit 4 to store the error states. This storage is reset by bit 5 or by switching off the
controllere.
This means if bit 4 is set and a configuration error occurs with a slave, the corresponding bit in the
extended device diagnosis remains set even if the slave is correctly detected again.
If - as described in the preceding section - the parameter "Extended Profibus Diag." was set to
"Disabled" (byte 37 bit 5 = FALSE), the controllere transmits no extended device-specific diagnostic
data. The controllere only transmits the standard diagnostic data which each Profibus DP slave must
at least supply (the first 6 bytes).
In some plants, jitters (
→
chapter 15 , Terms, abbreviations ) in the Profibus DP cycle time - which
occur for example for diagnostic calls - are not allowed, so that in these cases the plant diagnosis is
made via I/O data even if this extends the DP cycle time.