IntesisBox
®
ModBus RTU
– Fujitsu
User Manual r1.0 EN
© Intesis Software S.L.U. - All rights reserved
This information is subject to change without notice
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®
is a registered trademark of Intesis Software SLU
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11/21
o
This configuration is done via a Fujitsu remote controller connected to the indoor unit (Function
number “42” – setting value “1” / operation of Thermosensor button) and must be done by Fujitsu
authorized installers at the time of the installation of the AC.
o
Register value after FJ-AC-MBS-1 startup is -32768, which means that no temperature reference is
provided to the AC indoor unit. In that case, AC indoor unit will use its own return path temperature
sensor as reference for its control loop.
o
Virtual temperature mechanism will be activated once the first temperature value is received on
register 23
– in PLC addressing:
S
AC
= S
u
– (T
u
– S
U
)
Where:
S
AC
- setpoint value currently applied to the indoor unit
S
u
- setpoint value
T
u
- external temperature reference written at BACnet side
When FJ-AC-MBS-1 detects a change in any of the values of {S
u
, T
u
}, it will send the new setpoint
(S
AC
) to the indoor unit.
Moreover,
notice that temperature’s values of all these four registers are expressed according to the temperature´s
format configured through its onboard DIP-Switches (See
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). These following formats are possible:
•
Celsius value
: Value in Modbus register is the temperature value in Celsius (i.e. a value “22” in the
Modbus register must be interpreted as 22ºC).
•
Tenths of value
: Value in Modbus register is
the temperature value in decicelsius (i.e. a value “220”
in the Modbus register must be interpreted as 22.0ºC).
•
Fahrenheit value
: Value in Modbus register is the temperature value in Fahrenheit (i.e. a value “72”
in the Modbus register must be interpreted as 72ºF (~22ºC).
