Daikin DCOM-LT/IO — dCOM-LT/IO Reference Manual for Communication and Control [6/12]
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Daikin DCOM-LT/IO — dCOM-LT/IO Reference Manual for Communication and Control [6/12]

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Daikin DCOM-LT/IO Инструкция по монтажу онлайн [6/12] 607332
6 DCOM-LT/IO Reference Manual
English
ACNET LED Q
Colour Pattern Meaning
GREEN
33
Normal Communication
RED
33
Communications Errors
RED
30
Communications Failure
The ACNET LED will ash GREEN at irregular intervals when
a message is received to indicate normal communications
33.
If a communications error occurs the error will be indicated by
the LED ashing RED on each error. If the communications are
permanently in error then the LED will ash RED continuously
30.
RS485 LED
R
Colour Pattern Meaning
GREEN
33
Normal Communication
RED
33
Communications Errors
RED
30
Communications Failure
The RS485 LED will ash GREEN at irregular intervals when
a message is received to indicate normal communications
33.
If a communications error occurs the error will be indicated by
the LED ashing RED on each error. If the communications are
permanently in error then the LED will ash RED continuously
30.
RELAY 1 AND 2 LEDS
S T
Relay 1 and 2 LEDs will illuminate when corresponding relay
contacts are closed. Refer to the Description of Operation
section for specic relay functions.
If the DCOM status is Waiting for Altherma Master or
Synchronising with Altherma Master then Relay outputs will
be open circuit. If the DCOM status is Timeout Waiting for
Master then if a Relay Output is congured for Fault Indication,
then the relay will be closed. Refer to the Description of
Operation for further information.
DESCRIPTION OF OPERATION
The DCOM-LT/IO is a control interface for Daikin Altherma
units, refer to Daikin documentation on the Daikin Altherma
model and the controller compatibility. The DCOM-LT/IO has
4 modes of operation that are selected by the Conguration
Switches SW1. The modes are
• Resistance/Voltage Mode
• Sequencer Mode
• Smart Grid Mode
The conguration and functions of the inputs and outputs in
each mode are described in the following sections. Refer to
the DCOM-LT/IO Reference Manual for description of each
input function.
INPUT CONTROL FUNCTIONS
INFORMATION
Input control values are only applied when the DCOM
is synchronised with the Altherma system.
INFORMATION : ENFORCEMENT
Some Input functions Enforce unit operation to be On
and O󰀨, this will override any user or time schedule
changes to the unit function. Enforce operations
remain in place after an input has been changed.
Other Input functions only change unit operation when
the Input function changes and futher changes are
allowed by user or time schedule operation. Cases
where Enforced operation is in use are indicated in the
description of the Input function.
INFORMATION : STARTUP BEHAVIOUR
When the DCOM powers-up, or resynchronsises with
the Altherma Master, any inputs that are NOT enforced
will not update unit settings until the input value
changes after synchronisation has occurred.
In the case of inputs which change Setpoint and On/
o󰀨 state, the input must transition from an OFF to ON
state to transmit an ON command.
In the case of Enforced inputs the enforcement is
applied when the synchronisation occurs.
RESISTANCE INPUTS
When inputs are congured for resistance mode the following
input methods are available for changing control function
operation.
O/C
Input terminals are open-circuit or have a
measured resistance of >100kΩ
S/C
Input terminals are short-circuit or have a
measured resistance of <50Ω
10kΩ
Input terminals are connected to a xed
resistance of 10kΩ +/- 1kΩ
1-10kΩ
Input terminals are connected to a variable
resistance of 1-10kΩ
VOLTAGE INPUTS
When inputs are congured for voltage mode a 0-10VDC
signal can be used for changing control function operation.
<0.5V
V
+
-
Input terminals are open-circuit or have a
measured voltage of <0.5VDC
>0.9V
V
+
-
Input terminals are connected to an external
voltage source of >0.9VDC
1-10V
V
+
-
Input terminals are connected to an external
variable voltage source of 1-10VDC
NOTICE
Do not exceed the maximum input voltage of 10VDC
SETPOINT AND ON/OFF INPUT
In cases where an input is used for Setpoint and On/
O󰀨 operation, the associated control function is updated
only when the input resistance or voltage is changed. For
resistance mode the input value must change by at least
0.1kΩ, for voltage mode the input value must change by at
least 0.1V. If the control function value is modied by the
user the DCOM will not change the value until the input value
changes by the minimum specied amount.
The control function is switched On and O󰀨 by measurement of
the values specied below.

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