ABB ACS310 - Fieldbus References; Reference Selection and Correction

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 – 1103 or 1106 – to COMM, COMM+AI1 or
COMM*AI1. When 1103 REF1 SELECT or 1106 REF2 SELECT is set to COMM, the
fieldbus reference is forwarded as such without correction. When parameter 1103 or
1106 is set to COMM+AI1 or COMM*AI1, the fieldbus reference is corrected using
analog input AI1 as shown in the following examples.
Setting When COMM > 0 When COMM < 0
COM
M+AI1
COMM(%)
· (MAX-MIN) + MIN
+ (AI(%) -50%) · (MAX-MIN)
COMM(%) · (MAX-MIN) - MIN
+ (AI(%) -50%) · (MAX-MIN)
Maximum limit is defined by parameter 1105 REF1 MAX / 1108 REF2 MAX.
Minimum limit is defined by parameter 1104 REF1 MIN / 1107 REF2 MIN.
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
Aotewell Ltd
www.aotewell.com
Industry Automation
HongKong|UK|China
sales@aotewell.com
+86-755-8660-6182