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5.2.6 Map of MDT software version
The version number of the MDT software can be used for diagnostic purposes. Write
access to this parameter returns an error message, since the version number cannot
be edited.
5.3 SLK register area
The SLK register area contains all variables used to control how the SLK functions.
These variables can always be read or written, regardless of whether or not an MDT
is in the HF field.
5.3.1 Actual link state
The actual link state (operating state) of the SLK is an important parameter. The
link state indicates whether or not the SLK is waiting for an MDT (HF field is on),
whether or not an MDT is ready for data exchange, or whether or not the system is in
an error state.
Only the actual link state tells the application whether or not the command request
(see below) was also executed on the SLK.
An application (e.g., a PLC) has to implement all link states listed here. If the
application does not use prefetch, for example, the actual link state can also
temporarily return the value PRECONNECTED.
The actual link state is available by default in the event-oriented data channel of the
fieldbus and does not have to be read from a command. The application evaluates
the states using the coding in the following table:
Table 9: Actual link state
State Code Display Description
DISCONNECTED 1 OFF The SLK field is off. MDTs cannot sign on to the SLK.
Read access to the data from the previous MDT is pos-
sible through the fieldbus.
CONNECTING 2 WAI The SLK is ready for MDT sign-on. The field is on and
the next MDT will sign on to the SLK.
PRECONNECTED 3 PRE An MDT has signed on to the SLK. Automatic data ex-
change is running if prefetches were parameterized.
CONNECTED 4 CON The MDT is connected in the HF field, data can be
exchanged with the MDT.
ERROR 5 E00 The SLK has gone into the ERROR state, the field is off.
No other MDTs can sign on to the SLK. Active com-
munication with the MDT was interrupted without the
MDT signing off.
PROGRAM 6 PRG Temporary state
BUSY 7 BSY The SLK is processing the commanded link state.
PROOF COPY 1 | 20.05.2014 | FOR INTERNAL USE ONLY
ENGLISH
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