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Tapas Thakker posted a topic in Allen BradleyHello Guys, I am very new to CIP messaging and in our project, we are trying to Controllogix to SCADA server using CIP messaging: What I understand from the process right now is : 1. SCADA Opens a connection for Large forward Open ( Connection size set at 2500 bytes) 2. PLC responds and establishes a connection 3. SCADA send an MSP request to access tags from PLC 4. PLC responds to this request The problem we are facing is the PLC doesn't send out a response of more than 240 bytes, Have any of you guys have faced a similar issue or can help me with troubleshooting? Thanks in advance Attached screen captures from wire