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AB Industrietechnik srl – Via Julius Durst, 70 – 39042 BRESSANONE (BZ) Italy – Tel: +39 0472/830626 – info@industrietechnik.it – www.industrietechnik.it
Broadcast writing from MASTER to SLAVE
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MASTER_WR_ON_OFF
the MASTER controller ON/OFF sent depending on the
I90
parameter
(see paragraph
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20
)
MASTER_WR_EXT_TEMP
Value of the external temperature sensor connected to the MASTER controller
MASTER_WR_SEASON
Operational season set on the MASTER controller
MASTER_WR_SUPPLY_T
Value of the delivery temperature on the MASTER controller
MASTER_WR_ALARM_DEWPOINT
Alarm for temperature control lower than dew tempe
I45
on the MASTER controller
(see paragraph
³'HZSRLQWIXQFWLRQLQFRROLQJPRGH´SDJH
59
)
MASTER_WR_ALARM_CONDENS
Indication of condensation alarm from external contact (
M04
=4 or
M06
=4) connected to the MASTER controller
MASTER_WR_ALARM_GEN
Indication of general alarm from external contact (
M04
=6 or
M06
=6) connected to the MASTER controller
MASTER_WR_ALARM_LIM
Indication of limit alarm on the MASTER controller, if the limit function is enabled
(see paragraph
³6XSSO\OLPLWVIXQFWLRQ´SDJH
56
)
MASTER_WR_ALARM_TEMP_CT
Indication of high temperature from external contact (
M04
=7 or
M06
=7) connected to the MASTER controller
MASTER_WR_AUTHORIZATION
Validity key of the broadcast data.
Register value = 32478 if the sent data is valid
Register value
32478 if the sent data is not valid
Data sent by the MASTER controller prevail over the local settings performed on the SLAVE controllers.
SLAVE FROM MASTER register reading
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MASTER_RD_REG_ACTIVATION
Fluid control request (request for column pump, circulator activation and valve control)
MASTER_RD_DEHUM_REQUEST
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MASTER_RD_DEWPOINT_SLAVE
Dew temperature value +
I45
of the slave controller
MASTER_RD_ALARM_DEWPOINT
Alarm for temperature lower than dew tempe
I45
on the SLAVE controller
MASTER_RD_ALARM_CONDENS
Indication of condensation alarm from external contact (
M04
=4 or
M06
=4) connected to the SLAVE
controller
Sequence of messages sent or received by the MASTER controller:
Time (seconds)
Messages on the Modbus network
0
Ļ
MASTER reading of the SLAVE 1 controller registries
1
Ļ
MASTER reading of the SLAVE 2 controller registries
2
Ļ
MASTER reading of the SLAVE 3 controller registries
n (*)
Ļ
MASTER reading of the SLAVE n (
I85
) controller registries
n + 1
Broadcast writing from the MASTER controller to all SLAVE controllers
(*) Number n depends on the number of available slaves. To optimize the Modbus communication, set the parameter
I85
=n.
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controls the valve.
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-
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,I DW OHDVW RQH 6/$9(B; FRQWUROOHU LQGLFDWHV WKH GHZ RU FRQGHQVH SRLQW WKH ÀXLG FRQWURO LV QR ORQJHU SHUIRUPHG RQ WKH
0$67(5FRQWUROOHUFROXPQSXPSFLUFXODWRUDQGYDOYHDUHGLVDEOHGWKHGHKXPLGL¿HULIDQ\LVHQDEOHG6HHSDUDJUDSK
“26.
$ODUPV´SDJH
63
.
If the communication between the MASTER controller and the SLAVE controller is interrupted, after 120 seconds, the SLAVE
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and continues controlling based on its local settings.
Note: The MASTER controller is also able to manage a system without a slave controller composed of a pump, control valve,
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The next pages contain system examples.
