294 Fieldbus control with the embedded fieldbus
Fieldbus references
Reference selection and correction
Fieldbus reference (called COMM in signal selection contexts) is selected by setting a
reference selection parameter –
– to
or
. When
is set to
, the
fieldbus reference is forwarded as such without correction. When parameter
is set to
, the fieldbus reference is corrected using
analog input AI1 as shown in the following examples.
Setting
When COMM > 0
When COMM < 0
COMM(%)
· (MAX-MIN) + MIN
+ (AI(%) -50%) · (MAX-MIN)
COMM(%) · (MAX-MIN) - MIN
+ (AI(%) -50%) · (MAX-MIN)
Maximum limit is defined by parameter
.
Minimum limit is defined by parameter
/
.
AI = 50%
AI = 100%
AI = 0%
50
Corrected
reference
(Hz)
25
0
Max limit
Min limit
COMM
REF
(%)
100%
50%
0%
AI = 50%
AI = 0%
AI = 100%
Max limit
Min limit
COMM
REF
(%)
Corrected
reference
(Hz)
0
-25
-50
-100%
-50%
0%
AI = 50%
AI = 100%
AI = 0%
Corrected
reference
(Hz)
Max limit
Min limit
COMM
REF
(%)
100%
50%
0%
50
25
0
40
10
AI = 50%
AI = 0%
AI = 100%
Max limit
Min limit
COMM
REF
(%)
Corrected
reference
(Hz)
0
-25
-50
-100%
-50%
0%
-10
-40
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