69
Zehnder Eversky
25. Variable exchange tables
The Modbus addresses shown in the tables use the generic Modbus standard. There is no address offset to be expected,
the 1st existing variable is addressed at value 0 (not 1).
Scaling factor = 10 means that the value read must be divided by 10 to be converted into a real value. Example: if the
value read in the variable supply temperature is 230, this means that the temperature value is 230 / 10 = 23.0°C.
It is not possible to acknowledge alarms via communication. Acknowledgement must be performed manually in the
presence of a natural person directly on the machine's HMI after having identified and resolved the cause of the
problem.
The instructions sent by the communication have priority over all the other instructions (external and internal) except for
the on/off command of the screen which has absolute priority: if the local command is off, the unit cannot start even if
the BMS requests it. Therefore, in order for the BMS to work, the control must be on.
Specificity of Bacnet: the list of variables is linked to the configuration of the unit. For example, if the temperature
control is in constant supply, the air law variables are not accessible. If the unit is in pressure regulation (LOBBY), the
flow variables (MAC2) are not accessible.
