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Learn how to set up communication between Unity and M340 PLCs using Explicit Messaging for CIP Modbus Read. Detailed guide with configuration steps for seamless data exchange.
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CIP Modbus Object ReadExample M340 BMXNOC0401 usingExplicit unconnected_send request via DATA_EXCH to a Quantum 140NOC78000 Dec, 17, 2012 Rev 1.0
100.100.100.102 100.100.100.103 Unity7 PLC Hardware Configuration • BMXNOC0401 (100.100.100.103) to query NOC78000 (100.100.100.102) with Explicit Messaging CIP Modbus Object Read holding register • The USB connection is for Unity to M340 PLC communications.
M340 Unity Program • Note to add the ‘Pin negation’ on the activity bit ManagParam[0].0 • Configuring the DATA_EXCH ADR Input: • ADDM(‘0.1.0{100.100.100.102}UNC.CIP’) • Rack = 0 Module (Slot Number) = 1 Channel = 0 Remote Device IP address = 100.100.100.102 • Message Type = Unconnected_send Protocol = CIP
Declaring Variables 1- data to send / CIP Request header 24 bytes message footer Length of data to send in ManagParam[3] The DataToSend array has 3 part: the header (5 first word), the message (5 next word), the footer (2 last word)
Declaring Variables 2- Management parameters (array of 4 INT) 3- Reception data (array of 53 INT)
Example program in Quantum PLC • This data is incrementing every sec in the PLC to observe the data changing in the response. %MW2 is referring to the DataToSend[8], first and only Word to be read in this example
