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page 54
field bus PROFIBUS-DP
PacDrive™ M
6 Configuration, Parametrization
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Table 6-13: PROFIBUS-DP Slave / Parameter ModState
DataExMode
Access mode to Profibus data:
Table 6-14: PROFIBUS-DP slave / Parameter DataExMode
IOTrigger
Source giving the start signal for I/O data matching between
Profibus card and IEC address ranges.
4
not used
3
not used
2
PdAck Bit:
With every changing bit, a data exchange between module and Dpm is
indicated. Data exchange is triggered by the real-time process. The cycle
is equivalent to the real-time bus interval
1
DevAck Bit:
Handshake bit for controlling mailbox communication between MAx-4
PacController firmware and Profibus module
0
HostCom Bit:
Handshake bit for controlling cyclic Profibus process data communication
between MAx-4 PacController firmware and Profibus module
Parameter
values
Meaning
sync. buffered
firmware access to
PB data / 0
Access from the IEC program to the Profibus data is
synchronized. This means that consistent access via
system components is possible.
async. direct
firmware access to
PB data / 1
Access from the IEC program to the Profibus data is not
synchronized. This means that only byte consistent
access is possible. For write/read operations with larger
data, it is not guaranteed that the data bytes were
received/sent in the same data cycle.You should only use
the system components PrMaReceiveBYTE and
PrMaSendBYTE.
Trigger source
Meaning
no automatic IO
image matching /
0
No matching between IEC I/O ranges and DPM data on
Profibus card.
Bit
Meaning
Summary of Contents for PacDrive M
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