ATR243 User Manual - Northern Industrial

The parametercycle .The parameterhas the same meaning as the heating time(cooling fluid) pre-selects the proportionalband multiplier and the cooling PID time cycle basingon the type of cooling fluid:Cooling fluid typeAir 1.00 10Oil 1.25 4Water 2.50 2Once selected, the parameter , the parameters ,andcan however be changed.9 Serial CommunicationATR243-21ABC-T, equipped with RS485, can receive and broadcastdata via serial communication using MODBUS RTU protocol. Thedevice can only be configured as a Slave. This function enables thecontrol of multiple controllers connected to a supervisory system(SCADA).Each controller responds to a master query only if the query containsthe same address as that in the parameter . The addressespermitted range from 1 to 254 and there must not be controllers withthe same address on the same line.Address 255 can be used by the master to communicate with all theconnected equipment (broadcast mode), while with 0 all the devicesreceive the command, but no response is expected.ATR243 can introduce a delay (in milliseconds) in the response to themaster request. This delay must be set on parameter 72Each parameter change is saved by the controller in the EEPROMmemory (100000 writing cycles), while the setpoints are saved with adelay of ten seconds after the last change.NB: Changes made to words that are different from those reported inthe following table can lead to malfunction.ηττπ://νιχοντρολσ.χοm25