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ACH550-UH User’s Manual 1-197
Embedded fieldbus
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.)
PID control setpoint source
Use the following settings to select the fieldbus as the setpoint source for PID loops:
Communication fault
When using fieldbus control, specify the drive’s action if serial communication is lost.
Drive Parameter Value Setting
Protocol Reference
Modbus
N2 FLN BACnet
ABB
DRV
DCU
PROFILE
1501
AO
1
CONTENT
SEL
135 (
COMM
VALUE
1)
Analog Output 1
controlled by
writing to
parameter 0135.
– – – –
0135
COMM VALUE
1 – 40135 AO14 46 AO0
1507
AO
2
CONTENT
SEL
136 (
COMM
VALUE
2)
Analog Output 2
controlled by
writing to
parameter 0136.
– – – –
0136
COMM VALUE
2 – 40136 AO15 47 AO1
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
+
AI
1)
10
(
COMM
*
AI
1)
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)
Drive Parameter Value Description
3018
COMM FAULT FUNC
0 (
NOT SEL
)
1 (
FAULT
)
2 (
CONST SP
7)
3 (
LAST SPEED
)
Set for appropriate drive response.
3019
COMM FAULT TIME
Set time delay before acting on a communication loss.