Analog Output Control
Using the fieldbus for analog output control requires:
•
Drive parameter values set as defined below.
• Fieldbus controller supplied reference word(s) in the
appropriate location. (The location is defined by the
Protocol Reference, which is protocol dependent .)
Table 55: Analog Output Control Protocol Reference
Drive Parameter
Value
Setting
Protocol Reference
Modbus
N2
FLN
BACnet
abb drv
dcu profile
1501
AO1 CONTENT SEL
135
(COMM VALUE 1)
Analog Output 1 controlled by
writing to parameter 0135 .
—
—
—
—
0135
COMM VALUE 1
—
40135
AO14
46
AO0
PID Control Setpoint Source
Use the following settings to select the fieldbus as the setpoint source for PID loops:
Table 56: PID Control Setpoint Source Protocol Reference
Drive Parameter
Value
Setting
Protocol Reference
Modbus
N2
FLN
BACnet
abb drv
dcu profile
4010
SET POINT SEL
(Set 1)
8 (COMM VALUE 1)
9 (COMM + AI1)
10 (COMM*AI1)
Setpoint is either: Input Reference
2 (+/-/* AI1) . Control requires
parameter 1106 value = comm .
Process PID setpoint . Control
requires parameter 1106 value =
pid1 out and parameter 4010 value
= comm .
40003
AO2
61
AV17
4110
SET POINT SEL
(Set 2)
4210
SET POINT SEL (Ext/
Trim)
Communication Fault
When using fieldbus control, specify the drive’s action if serial communication is lost.
Table 57: Communication Fault Reference
Drive Parameter
Value
Description
3018
COMM FAULT FUNC
0 (NOT SEL)
1 (FAULT)
2 (CONST SP7)
3 (LAST SPEED)
Set for appropriate drive response .
3019
COMM FAULT TIME
Set time delay before acting on a communication loss .
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