Rockwell Automation 20-750-BNETIP BACnet/IP Option Module - Manual (Page 39)

Rockwell Automation Publication 750COM-UM005B-EN-P - June 2014 39
Using BACnet Services and Objects Chapter 4
Basic Drive Operation on
the Network
This section describes how to operate a drive on the network using a combination
of BACnet object types for basic control.
Basic Drive Control (Start/Stop)
Write a speed reference value (in %) to the Reference 1 Analog Value object
(AV0) Present Value property.
1. To start the drive, write a value of ‘1’ to the Run/Stop Binary Value object
(BV10) Present Value property.
2. To stop the drive, write a value of ‘0’ (zero) to the Run/Stop Binary Value
object (BV10) Present Value property.
Using an Alternate Speed Reference
Follow these steps to assign an alternate speed reference to the drive.
1. Write a speed reference value (in %) to the Reference 2 Analog Value
object (AV1) Present Value property.
2. Write a value of ‘1’ to the Ref2/Ref1 Binary Value object (BV12) Present
Value property.
Changing Motor Rotation Direction
To command a reverse direction of motor rotation when the drive is running,
write a value of ‘1’ to the Rev/Fwd Binary Value object (BV11) Present Value
property. To command a forward direction when the drive is running, write a
value of ‘0’ (zero) to the Rev/Fwd Binary Value object (BV11) Present Value
property.
Clearing a Drive Fault
To clear a drive fault, write a value of ‘1’ to the Clear Faults Binary Value object
(BV13) Present Value property.
ATTENTION: Control information written to the option module by a
BACnet controller is volatile. That is, it will be erased by an option module
reset or power cycle. For example, if a BACnet controller writes to a Binary
Output (BO) object to energize an output relay on the drive and then that
drive is reset or power cycled, the drive returns the relay to its default
(de-energized) state. The option module does not attempt to restore the
relay to the energized state unless a BACnet controller writes to it again.