Category: Industrial Networks
EtherCAT Replacement Has the Same Inputs but Wrong Data? Check PDO Mapping
Matching channel counts do not guarantee matching process data.
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Ethernet Port Keeps Renegotiating? Read Link Events Before Protocol Logs
Repeated link-down and link-up events point below the application protocol.
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Multicast Works After Reboot Then Stops? Check IGMP Membership
A multicast stream that stops after a repeatable interval may have lost forwarding membership.
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PLC Address Changes After Restart? Check How the Address Is Assigned
An address visible today may have been leased rather than stored permanently.
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SCADA Connects by IP but Fails by Name? Follow DNS Resolution
A successful IP connection with a failed hostname connection points toward name resolution or name-dependent service configuration.
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Modbus Exception 02 Is a Reply, Not a Timeout
Exception 02 means the server replied that the requested data address was not allowed.
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Modbus Register Exists but Reads Wrong? Check Function 03 Versus 04
The same numerical address can identify different objects under different Modbus functions.
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RS-485 Fails When One More Device Is Added? Check the Electrical Bus
Adding one RS-485 device changes more than the address list.
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Imported the EDS or GSDML File but the Device Still Fails? Check What It Describes
Installing a device-description file helps the engineering tool understand a product.
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IO-Link Sensor Is Online but the Value Is Wrong? Open the IODD
An online IO-Link sensor can deliver valid bytes that the PLC decodes incorrectly.
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