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SI-INTERBUS User Guide
33
Issue Number: 1
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Introd
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8.1.1
Mapping for CT Single Word non-cyclic data
To configure an SI-Interbus in slot 3 for CT Single Word mode non-cyclic data, the
following steps must be performed:
•
Set Pr
17.005
to the required mode
•
Set Pr
17.032
to On to reset and reconfigure the SI-Interbus
When the SI-Interbus re-initialises, it will map cyclic data IN word 0 and OUT word 0 to
the CT Single Word protocol parameter, Pr
61.50
. All existing mapping parameters will
be moved down by 1 place, i.e. the previous mapping set in Pr
17.010
and Pr
17.020
will now appear in Pr
17.011
and Pr
17.021
respectively.
Six cyclic words with CT Single Word non-cyclic data mapping
shows
what happens to the mappings when the data format is changed from 6 cyclic words to
6 cyclic words with CT Single Word non-cyclic data.
Table 8-2 Six cyclic words with CT Single Word non-cyclic data mapping
The problem with this setup is that the user defined mappings (Pr
17.012
and
Pr
17.022
) are lost when the SI-Interbus is re-initialised. This is because there is
insufficient mappings available to move the user defined channel into.
To maintain all mappings when adding the CT Single Word non-cyclic data channel,
the cyclic data format (Pr
17.005
) needs to be set to 108, this adds an additional cyclic
channel to accommodate the user defined channel as shown in
words with CT Single Word non-cyclic data mapping
Mapping
Parameter
Before format change
(Pr 17.005 = 6)
After format change
(Pr 17.005 = 6)
Value
Mapping
Value
Mapping
Pr
17.010
1040
Pr
10.40
,
Status Word
6150
Pr
61.50
,
CT Single Word
non-cyclic mode 1
Pr
17.011
201
Pr
2.01
,
Post Ramp
Reference
1040
Pr
10.40
,
Status Word
Pr
17.012
0
User Defined
201
Pr
2.01
,
Post Ramp
Reference
Pr
17.013
to
Pr
17.019
0
Not available
0
Not available
Pr
17.020
642
Pr
6.42
,
Control Word
6150
Pr
61.50
,
CT Single Word
non-cyclic mode 1
Pr
17.021
121
Pr
1.21
,
Preset Reference 1
642
Pr
6.42
,
Control Word
Pr
17.022
0
User Defined
121
Pr
1.21
,
Preset Reference 1
Pr
17.023
to
Pr
17.029
0
Not available
0
Not available