Small" Network Solutions - Daikin FWTOUCH Manual De Instalacion Y Uso

7.2 "SMALL" NETWORK SOLUTIONS

The "SMALL" network solutions constitute a Mas-
ter/Slave network system in which one of the
controllers FWTOUCH carries out the function
of MASTER while all the other network control-
lers FWTOUCH carry out the function of SLAVE.
There are two possibilities of implementa-
tion, each with different functions and type of
connection:
Ū SMALL network on RS485
Ū SMALL network on POWER-LINE COMMUNI-
CATION
7.2.1 SMALL network on RS485
In this case the connection is made via an RS485
bus, consisting of a twisted and shielded 2-con-
ductor data cable. See 11.2 p. 144
INFO:
For details on the network wiring it is
recommended to read the document "RS485
network guidelines", available in the Daikin
website's download area.
The MASTER controller sends the following set-
tings to the SLAVE controllers:
Ū Operating mode: (Cooling or heating);
Ū ON/OFF status of the controller: all SLAVE
controllers will conform to the ON/OFF status
of the MASTER controller;
Ū Enabling minimum room temperature con-
trol;
Ū Room temperature SET-POINT;
or (according to the "Temperature control from
MASTER" parameter in the "Networks and Con-
nections" menu):
Ū Limits for adjusting the room temperature
SET-POINT (in both SUMMER and WINTER
modes): on each SLAVE controller the SET-
POINT can be adjusted by ± 2°C around the
SET-POINT value programmed on the MAS-
TER controller.
As regards the ON/OFF status, on each SLAVE
controller the following is allowed:
Ū automatic local ON, in the event of a request
from the minimum room temperature con-
trol function
Ū Automatic local ON/OFF according to the
time slots, where enabled;
Ū OFF on SLAVE controller from digital input if
enabled.
Each SLAVE controller retains autonomy with
respect to fan speed, activation of the ECON-
OMY function and selection of the SETPOINT
(within the above-described limits).
This type of network does not allow the pres-
ence also of a monitoring network because the
RS485 serial ports of all controllers (both MAS-
TER and SLAVE) are already occupied due to the
implementation of the SMALL network.
Once you have wired the network, you must
configure each FWTOUCH controller. Enter the
list of network and connection parameters (ac-
cessible via the key in the USER MENU) and set
the RS485 SETUP parameters as follows:
Ū MST/SLV = set "Master" on the FWTOUCH
controller that constitutes the MASTER of
the network, and set "Local Slave" on all FW-
TOUCH controllers that constitute the SLAVES
of the network.
Ū Protocol = "Modbus"
Ū Serial address = set a value from 1 to 255 only
in the SLAVE controllers.
Ū Speed = do not change (9600)
Leave the PLC set-up parameters unchanged
(MST/SLV = none).
7.2.2 SMALL network on power-line
communication
This type of configuration makes it possible to
control up to a maximum of 32 hydronic indoor
units via a single user interface.
The connection is made via a PLC bus, consist-
ing of a twisted and shielded 2-conductor data
cable. See 11.3 p. 144.
The MASTER controller, in this case, imposes on
all SLAVE controllers connected to the network
an operation (instant by instant) that is identical
to that of the MASTER controller itself. Therefore,
each SLAVE controller has no decision-mak-
ing autonomy and does not have its own user
interface.
Before connecting the circuit boards to the net-
work, it is necessary to configure each circuit
board.
Connect the user interface to each circuit board.
Enter the list of network and connection param-
eters (accessible via the key in the USER MENU)
and set the PLC SETUP parameters as follows:
Ū MST/SLV = set "Master" on the circuit board
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FC66006287