industrie technik evolution AHU-XXXSX1 series, User Manual

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41. Modbus (for AHU-xMxSx1 models)
The regulator implements the Modbus Slave protocol and can communicate remotely with a Modbus Master unit.
All parameters and variables are accessible as holding registers and R/W operations can be implemented as function codes
(FC=03, 06, 16).
Given the large number of parameters, the protocol can read up to 125 variables at a time.
Select a suitable timeout between readings, in relation to the baud rate.
A timeout of 1.5 is sufficient for baud rates of 19200 and 9600. For other baud rates, increase the timeout value to 2 seconds.
To obtain the address of a register indicated in the following tables, subtract 1 from the register number indicated:
example: the address of the Modbus variable
STATE_DI1
is 10000 - 1 = 9999
• MODBUS VARIABLES FOR CONTROLLER STATUS:
Register Description Min Max R/W
10000 STATE_DI1
→ 0=contact
DI1
open, 1=contact
DI1
closed
0 1 R
10001
STATE_DI2 → 0=contact DI2 open, 1=contact DI2 closed
0 1 R
10002
INT_TEMP_COMP → internal sensor temperature (°C [°F])
(Note1)
-250 [-13] 900 [195] R
10003
TEMP_AI1 → remote sensor temperature 1 (°C [°F])
(Note1) -250 [-13] 900 [195] R
10004
TEMP_AI2 → remote sensor temperature 2 (°C [°F])
(Note1)
-250 [-13] 900 [195] R
10005
TEMP_AI3 → remote sensor temperature 3 (°C [°F])
(Note1) -250 [-13] 900 [195] R
10006
INT_HUM_COMP → internal humidity sensor (% R.H.)
0 100 R
10007 0_10V_AI3
→ value connected to the input 0...10 V
AI3
(Note4)
-999 9999 R
10008
STATE_REL1 → 0=relay 1 deactivated, 1=relay 1 activated
0 1 R/W
10009
STATE_REL2 → 0=relay 2 deactivated, 1=relay 2 activated
0 1 R/W
10010
STATE_REL3 → 0=relay 3 deactivated, 1=relay 3 activated
0 1 R/W
10011
STATE_REL4 → 0=relay 4 deactivated, 1=relay 4 activated
0 1 R/W
10012
STATE_REL5 → 0=relay 5 deactivated, 1=relay 5 activated
0 1 R/W
10013
OUT_A → output value AO1 (volt)
(Note3)
0 100 R/W
10014
OUT_B → output value AO2 (volt)
(Note3) 0 100 R/W
10015
OUT_C → output value AO3 (volt)
(Note3)
0 100 R/W
10016 WORKING_TEMP
→ working temperature
(Note1)
-250 [-13] 900 [195] R
10017
WORKING_SET_HEAT → heating operation setpoint WHS
(Note2) see parameters see parameters R
10018
WORKING_SET_COOL → cooling operation setpoint WCS
(Note2)
see parameters see parameters R
10019
SET_MAND_CALC → calculated supply setpoint in cascade control mode
(Note2) see regulation. see regulation. R
10020
SET_COMP_HEAT_CALC → calculated compensation setpoint for winter compensation
control mode
(Note2)
see regulation. see regulation. R
10021
SET_COMP_COOL_CALC → calculated compensation setpoint for summer compensation
control mode
(Note2)
see regulation. see regulation. R
10022
WORKING_SET_DEHUM → dehumidifying operation setpoint WDS
(Not5)
see regulation. see regulation. R
10023
WORKING_SET_HUM → humidifying operation setpoint WUS
(Note5) see regulation. see regulation. R
10024
YEAR → current year
2012 2100 R
10025
MONTH → current month
1 12 R
10026
DAY → current day
1 31 R
10027
DAY_NAME → name of current day
0=sunday
1=monday
2=tuesday
3=wednesday
4=thursday
5=friday
6=saturday
0 6 R
10028 HOUR → current time (hour) 0 23 R
10029 MIN → current time (min.) 0 59 R
10030 SEC → current time (sec.) 0 59 R
10031
TOTAL_HOUR_OF_FAN → number of hours of operation of the fan (only if the parameter
192
is not equal to 0; otherwise, the value read is always 0)
0 9999 R
10032
CURRENT_WORKING_SET → current operation setpoint
(Note2)
see controllers. see controllers. R