ECKELMANN Case Controller UA 4 E Series - Sending and Receiving the Analogue Values Via CAN Bus

Firmware V3.13
21.04.2021
55/466
5.7.9 Sending and receiving the analogue values via CAN bus
It is possible to receive analogue values (t0, humidity, tc) from a remote case controller, and conversely to
sendthemtoasmanycasecontrollerswithinthesystemasdesired.Thisservestoreducethenumberof
pressuretransmittersinstalledinthesystem,thusleadingtoareductionincosts.
The necessary parameterisation is carried out in menu 6-2-6.
Sending the analogue values
By setting the parameter AIN1/2 Send CAN the corresponding analogue value is made available within the
CANbusandcanbereceivedbyothercasecontrollers.
Receiving the analogue values
UsingtheparametersAIN1/2Rcv.CANto„YES“theanaloguevaluescanbereceivedfromaremotecase
controller.TheparametersAIN1/2Rcv.CANrepresenttheCANbusaddressofthecasecontrollerwhichsends
theanaloguevalues.
Priority of the local pressure transmitter
The local pressure transmitter always has a higher priority than analogue values that are transmitted via
theCANbus.Ifvaluesfrombothsourcesareavailablethenthecontrollerwillusethevaluefromthelocal
pressuretransmitter.Thisaffectsthedatarecording,visualisation,andwiththecorresponding
parameterisation,thecontrolfunctions.
Example:Configurationoftheanaloguevaluesforthesendingandreceivingoftheanaloguevaluesfor
Zone 1
Task
Four island freezers are to use the same pressure transmitter. In order to do this the pressure transmitter
isconnectedtoacasecontrollerandthepressurevaluesrecordedmadeavailabletotheotherthreecase
controllers.
The following parameters need to be set:
1.Configurationoftheremotecasecontroller–forexamplethishastheCANbusaddress15
Menu 6-2-6:
ParameterAIN1activsetto“Yes”(analogueinput1isused)
Parameter Refrig.Z 1 (selection of the refrigerant)
Parameter LP Z1 min. (smallest pressure value for pressure monitoring at 4 mA)
Parameter LP Z1 max. (largest pressure value for pressure monitoring at 20 mA)
ParameterAIN1SendCANsetto“Yes”(thisisthereforetheremotecasecontroller)
ParameterAIN1Rcv.CANsetto“–“
ParameterAIN1Rcv.AIN1setto“1”
Acasecontrollerwherethisparameterhasbeensetto“YES”istermeda“RemoteCaseController”.
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ATTENTION
Beware of incorrect parameterisation! If the analogue value measured locally by the pressure
transmitter is not sent directly to the controller then the analogue value received via the CAN bus is
always used!
In the event of unsuitable parameterisation this can result in malfunctioning.
If the analogue value measured locally by the pressure transmitter is sent directly to the controller then
the analogue value received via the CAN bus is never used!
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