Profibus DP 55/176
3 842 530 344/2014-05, MIT: ID 40, Bosch Rexroth AG
The following functions have been completed when the counter value changes:
• Pretransmit data has been entered in the MDT (if parameterized)
• Prefetch data was read from the MDT (if parameterized) and is ready to be
imported to a PLC DB
• If auto reconnect is active, the MDT was closed and the link state is CONNECTING
• If auto disconnect is active, the MDT was closed and the link state is
DISCONNECTED
• If no auto mode is active, the link state is CONNECTED. Data can be exchanged
with the MDT.
Table 15: Status byte 01 of event-oriented data exchange
Byte 1 (bits 0–7)
7 6 5 4 3 2 1 0
Actual link state Data
transfer
status
Prefetch
param.
open
Prefetch
param-
eterized
Operative
flag
Bit 0 shows the status of the SLK operative flag, see Chapter 5.3.4.
Bits 1 and 2 show the current status of prefetch parameterization. The flags apply
both to the unbuffered prefetch function and the buffered prefetch.
Bit 1 Prefetch is parameterized:
‘0’ = no prefetch currently parameterized in system
‘1’ = at least one unbuffered prefetch or one buffered prefetch is parameterized
Bit 2 Prefetch parameterization is open:
“0” = prefetch parameterization is closed. If prefetches have already been
parameterized, these are executed once the system completes the PRECONNECTED
state.
‘1’ = prefetch parameterization is open. No prefetches are executed in this state.
Bit 3 Data transfer status (see Chapter 6.6 “‘Open transfer’ and ‘Close transfer’
functions”):
‘1’ = “Open transfer” command executed
‘0’ = “Close transfer” command executed
Bits 7 to 7 show the actual link state (see Chapter 5.3.1 “Actual link state”).
7.3.2 Data array for event-oriented data channel
The SLK provides the data from the unbuffered prefetch starting with the third byte
of the event-oriented data exchange. If no prefetch was executed, the value of each
byte is zero.
PROOF COPY 1 | 20.05.2014 | FOR INTERNAL USE ONLY
ENGLISH
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