PLC Data Collection Validation Using Error Detection Code Matching

The patent applies preliminary action by performing verification of definition information before actual data collection begins. The controller compares the definition information from the input module with the stored virtual copy in advance, and only after successful verification does it permit data collection to proceed. This preliminary check ensures data integrity is maintained while avoiding unnecessary interruptions to data collection, as the verification happens once at the start rather than continuously during operation.

The patent reduces system complexity by using a virtual copy of definition information stored in the controller's memory rather than implementing complex hardware verification mechanisms. The copying approach allows the controller to simply compare data values between the incoming definition information and the stored copy using standard processing operations. This method provides robust security against corrupted data while avoiding the need for additional specialized hardware or complex verification algorithms, thereby maintaining data security without significantly increasing device complexity.