Functioning description:
The unit configured as Master constantly communicates with the slave connected by means of
485, sending them data of the steam to be produced (0-100%) and managing the priorities of the
various units relating to discharges for deconcentration or test.
The functioning mode of the Master/Slave unit set is set only on Master by means of variable
S9, as well as the eventual connection of the ambient humidity probe, of the channel humidity
probe, of the signal of reference 0-10V, the ON-OFF enabling and the setting of the wanted
humidity set.
Whereas, the Pr variable representing the steam output percentage at maximum output, is set on
each individual unit.
The lacking of enabling (clamps 24 and 25 open on 100Master board) behaves as follows:
- On Master unit, stops (OFF flashing) the same unit and all slave units connected.
- On Slave units, stops (OFF flashing) only slave unit of interest.
The insertion of the stand-by, by means of dedicated key, behaves as follows:
- If activated on Master unit, places machine in stand-by (LED on stand-by button flashing)
and bring the steam output request of the connected slave to zero.
- On Slave units, stops only the slave unit of interest, placing the machine in stand-by (LED
on stand-by button flashing).
Should Master not find a slave, after a 15 sec timeout, it signals the problem with an alarm
message that can be switched off (E7). Such alarm does not block normal functioning. Slave
interrogation continues and if communication starts again, the error is automatically reset.
If Slave is not interrogated by Master within a 15 sec timeout, Slave considers connection with
the same interrupted and brings steam output to 0, disconnecting the electrodes and signalling
the anomaly with an alarm that can be switched off (E8). Should connection start again, the
error is automatically reset and normal functioning starts again.
Variable S9 on humidifiers configures as Slave (mS=1) is not taken into consideration; steam
output proportionally follows data sent by Master on RS485.
Test and deconcentration discharge priority management:
The priorities of discharge for deconcentration and for diagnostic test, are managed as follows:
When interrogated, the Slave units send eventual discharge request to Master that manages them
with FIFO (first input/first output).
Master awaits 3 minutes before giving successive consent to unit in stand-by, following priority
in FIFO; this allows the unit currently in discharge, to start steam output again.
The Slave unit having requested a discharge, awaits 45 minutes for consent from Master, after
which discharged is performed anyhow (Time out).
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