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Modbus CMP Ethernet Driver for JMobile

Modbus CMP Ethernet Driver for JMobile

Tech-noteCT

Tech-noteCT Modbus CMP Ethernet DriverThe Modbus CMP communication protocol is known also as “Modbus over CTNet”CMP stands for CTNet Message Protocol; it is a messaging system designed to implement distributedcontrol applications. The protocol permits exchange of parameters between Control Techniquesdrives and HMI devices, SCADA systems or other computer applications.CMP is normally encapsulated in an existing network protocol. CMP has been successfullyencapsulated also into the Modbus network. The communication protocol support implements theModbus encapsulation of CMP.Unidrive SP drives support the CTNet network using optional communication units called “SMApplications” modules.Please note that changes in the communication protocol specifications or PLC hardware may haveoccurred since this documentation was created. Some changes may eventually affect the functionalityof this communication driver. Always test and verify the functionality of your application. To fullysupport changes in PLC hardware and communication protocols, communication drivers arecontinuously updated. Always ensure that the latest version of communication driver is used in yourapplication.Concept of OperationThe network topology supported by the HMI communication protocol is shown in Figure 1.The HMI panel will communicate with a set of drives over the network; drives are addressed usingtheir Modbus ID node number.Each drive can host up to three SM application boards; they may be used for CTNet communication.The addressing model is based on a three level space; from the HMI point of view, each drive isidentified with a unique ID composed of a maximum of three numbers; the ID can be calculatedlooking to the network topology.ptn0410-0.doc - 28.03.2013Control Techniques Unidrive - Modbus CMP Ethernet Driver for JMobile 4

Tech-noteFigure 1Protocol Editor SettingsAdd (+) a driver in the Protocol Editor and select the protocol called “CT Modbus CMP ETH” from thelist of available protocols.ptn0410-0.doc - 28.03.2013Control Techniques Unidrive - Modbus CMP Ethernet Driver for JMobile 5

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