To fully understand the system, it is vital to grasp what happens when a button is pressed or released (digital input closed or opened); every time
there is a change to an input, the corresponding module sends a message over the bus which, as mentioned previously, can be destined for various
recipients:
- a module and one or more of the outputs on it;
- a zone;
- the supervisor (touch pc or operator panel).
If the recipient is a module, its serial number and one or more of the outputs involved should be indicated, while if it is a zone, its identi cation
number should be indicated. Finally, if the recipient is supervisor, nothing else has to be indicated, as it is always open to bus communication and
will receive the command originating from the module, applying for example a programmed scenario.
The type of command transmitted by a module can be classi ed as follows:
- NORMAL: the output(s) receive the message and, if it is compatible with their pro le, are activated, otherwise their status does not change;
- SET or RESET: the output(s) are forced into action, regardless of how they are programmed, so if a RESET command is sent, the output(s) are de-
energised.
Analogue inputs, on the other hand, can perform the following functions:
- ONLY ON DEMAND: the module constantly reads and logs the input value (converted into scale from 0 to 255), only sending it when requested (by a
supervisor, for example);
- SEND STATUS AUTOMATICALLY: the module constantly reads and logs the input value (converted into scale from 0 to 255), sending it at regular
intervals as speci ed;
- AUTOMATIC ACTIVATION ON SETPOINTS: if this function is used, up to 8 setpoints can be selected, meaning that when the measured value exceeds
or falls below these values a message is sent to a module/output, a zone or the supervisor, as if it were a digital module;
- BCD ROOM THERMOSTAT: this function is suitable for temperature sensor (20046708) connection, for the correct reading of the value in degrees
Centigrade. At each pre-set time interval, the module checks the difference between the measured value (with a resolution of 0.1°C) and the selected
setpoint (summer/winter, day/night/room empty) and sends the activation or deactivation command to a module/output.
1.7 - DIGITAL AND ANALOGUE OUTPUT OPERATING PRINCIPLE
Each digital output has a function associated with it. When an output receives a "Normal" message from an input, it carries out the programmed
function; otherwise, if it receives a forced command (SET or RESET), it carries out that command regardless of the function for which it was
con gured. Being multifunctional modules, different types of output are available on a programming level.
DIGITAL OUTPUT TYPES
MONOSTABLE
When the output receives an active input status (e.g. button pressed) it is activated, when it receives an inactive input
status it is deactivated (e.g. doorbell or bathroom pull-cord).
BISTABLE
When the output receives an active input status (e.g. button pressed), it changes its own status in turn. If it receives an
inactive input status, it does not make any changes (e.g. lights). This type of output can only be controlled by buttons.
INVERTER
When the output receives a message from the input, regardless of whether it is an input active or inactive message, it
changes status (e.g. lights).
N.B. This type of output allows use of the bistable function if the command originates from switches, diverters or
inverters already present in the system instead of from buttons.
TIMED
When the output receives an input active status, it is in turn activated, starting a timer; when the set time has elapsed,
it is deactivated automatically. If it receives an inactive input status, it does not make any changes (e.g. timed stair
lights or boxes).
N.B. This type of output can only be controlled by buttons.
1.6 - DIGITAL AND ANALOGUE INPUT OPERATING PRINCIPLE
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