Daikin Trailblazer AGZ030E-070E - Page 122

IOM 1207-6 • TRAILBLAZER
®
MODEL AGZ CHILLERS 122 www.DaikinApplied.com
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Modbus Communication
The VFD controller (frequency controller) is a native Modbus
device. In other words, it does not require any additional
communication card or other hardware for integration into a
building automation system (BAS) via the Modbus network.
The conguration process is described in the following section.
It is assumed that the user is familiar with Modbus technology
and terminology.
Standard Modbus network rules apply. The network is a daisy-
chain of unit controllers including the master (in this case, the
BAS) and all slaves (VFD controller). The Modbus standard
recommends that the network be terminated on each end with
the characteristic impedance of the network (about 120 ohms).
Follow the guidelines stated in the Modbus specications.
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Table 85 denes the network parameters of the Modbus
Communication Module that are available via the graphical
interface. The Modbus network address and data transmission
rate (Baud Rate) are available via the local control panel. At
a minimum, you must set the network address and verify the
correct baud rate before establishing network communication
between the VFD controller and the BAS. Change remaining
parameters as required for your network.
1. Set the Modbus network parameters as described
in Table 85. It is recommended that remaining items
in menus 8-* remain at factory defaults. See VFD
installation manual, available on www.DaikinApplied.com
for further details.
2. Cycle power to the VFD controller for changes to take
e󰀨ect.
3. Verify connection from BAS to VFD - terminals 68 (+)
and 69 (-) on the main control board of the frequency
converter.
4. The VFD controller is now ready for network
conguration from the BAS. Refer to the Modbus
Operations Manual for the AGZ-E VFD Controller, which
is available on www.DaikinApplied.com, for a complete
points list and additional conguration information.
Table 85: Modbus Network Parameters
Parameter  Default Value
8-02 Control
Source
FC Port [1]/ On-board RS-485 port FC Port [1]
8-30 Protocol
Modbus RTU [2]/The protocol
setting for the communication port
FC [0]
8-31 Address
1-247/The Modbus Address of
VFD; this address must be unique
throughout the entire Modbus
network.
1
8-32 Baud
Rate
2400 - 115200/This value should be
set the same as all other devices on
the trunk.
9600 baud [2]
8-33 Parity/
Stop Bits
Even parity, 1 stop bit [0]; Odd
Parity, 1 Stop Bit [1]; No Parity,
1 Stop Bit [2]; No Parity, 2 Stop
Bits [3]/Set to match the network
settings
Even parity, 1
stop bit [0]
NOTE: Remaining items in menus 8-* should likely remain
at factory defaults. See VFD installation manual for
further details.
Figure 94: Modbus RTU Connection