X20 system modules • Analog output modules • X20AO2438
422
X20 system User's Manual 3.10
4.4.3.10.6.3 Extended configuration
The additional configuration registers are specified values when the module is started. In most systems, the user
does not need to make any adjustments here. Register values should only be changed if HART network commu-
nication is not taking place satisfactorily.
HartNodeDisable
Name:
HartNodeDisable_1 to HartNodeDisable_2
These registers are intended for things like maintenance. They make it possible to cut off configured HART nodes
to suppress error messages for a certain period of time. During normal operation, the configured nodes must be
switched active to guarantee that the procedure runs smoothly.
Data type
Value
UINT
See bit structure.
Bit structure:
Bit
Name
Value
Information
0
Enabled (bus controller default)
0
Node 0 (default mode)
Node 1 (multidrop mode)
1
Disabled
0
Enabled
1
Node 2 (multidrop mode)
1
Disabled (bus controller default)
...
...
0
Enabled
13
Node 14 (multidrop mode)
1
Disabled (bus controller default)
0
Enabled
14
Node 15 (multidrop mode)
1
Disabled (bus controller default)
15
Reserved
-
HartProtTimeOut
Name:
HartProtTimeOut_1 to HartProtTimeOut_2
These registers specify the time span within which the slave must respond for the response to be valid.
Data type
Values [ms]
Information
UINT
0 to 65535
Bus controller default: 256 [ms]
HartProtRetry
Name:
HartProtRetry_1 to HartProtRetry_2
These registers determine how many times the master retries a request if it receives an invalid response or no
response at all.
Data type
Value
Information
UINT
0 to 65535
Bus controller default: 3 attempts
HartPreamble
Name:
HartPreamble_1 to HartPreamble_2
The length of the preamble can be set in these registers. The preamble is used to synchronize the receiver to the
transmitter. The longer the declared preamble, the less chance that a communication error will occur. Nevertheless,
a useful signal is not transmitted during synchronization so the preamble should be kept as short as possible.
Data type
Value
Information
UINT
5 to 20
Bus controller default: 20
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