Instructions

Intesis
TM
INMBSSAM001R000
User’s Manual r1.3 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
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4.2.3 Considerations on Temperature Registers
• AC unit temperature setpoint (R/W)
(register 4 – in Protocol address / register 5 – in PLC address):
This is the adjustable temperature setpoint value that must be required by the user. This
register can be read (Modbus function 3 or 4) or written (Modbus functions 6 or 16). A
remote controller connected to the Samsung indoor unit will report the same
temperature setpoint value as this register, but only will happen when no AC unit´s
external reference is provided from INMBSSAM001R000 (see detail for register 22/23
below).
• AC unit temperature reference (R)
(register 5 – in Protocol address / register 6 – in PLC address):
This register reports the temperature that is currently used by the Samsung indoor unit
as the reference of its own control loop. Depending on the configuration of the indoor
unit, this value can be the temperature reported by the sensor on the return path of the
Samsung indoor unit or the sensor of its remote controller. It is a read-only register
(Modbus functions 3 or 4).
• AC unit external temperature reference (Modbus) (R/W)
(register 22 – in Protocol address / register 23 – in PLC address):
This register allows us to provide an external temperature’s sensor from the Modbus
side. Samsung indoor unit does not allow on devices like INMBSSAM001R000 to provide
directly temperature to be used as a reference of the control loop of the AC indoor unit.
In order to overcome this limitation and enable the usage of an external temperature
sensor (i.e.from Modbus side), INMBSSAM001R000 applies the following mechanism
(only if “external temperature’s reference” is being used):
o After a couple of values have been entered in the “AC unit external temperature’s
reference” (register 22/23) and “AC unit temperature set point” (register 4/5),
INMBSSAM001R000 is going to estimate the temperature chosen implied (e.g. if a
“temperature setpoint (register 4/5)” of 22ºC, and an “external temperature
reference (register 22/23)” of 20ºC are entered, INMBSSAM001R000 will assume
that the user is demanding a +2ºC increase in temperature).
o By knowing at any time the ambient temperature currently used by the indoor
unit to control its own operation (register 5/6), INMBSSAM001R000 can calculate
the required temperature setpoint needed to apply the decrease/increase on the
real temperature and reach the temperature chosen by the user (following the
example above, if INMBSSAM001R000 reads an “ambient temperature” (register
5/6) of 24ºC in the indoor unit, it will apply a final setpoint of 24ºC + 2ºC =
26ºC).
o At this moment, each time that INMBSSAM001R000 detects a change on the
ambient temperature reported by the indoor unit (register 5/6), it will also
change the required setpoint, in order to keep the temperature required by the
user at any time. If we follow the last example, if INMBSSAM001R000 receives a
new temperature´s value coming from the indoor unit of 25ºC,
INMBSSAM001R000 will automatically adjust the temperature setpoint required of
the AC indoor unit to 25ºC + 2ºC = 27ºC).
o In general, INMBSSAM001R000 is constantly applying the “Virtual Temperature”
formula:
S
AC
= S
u
– ( T
u
– T
AC
)