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Additional resources for Modbus messaging on TCP-IP implementation guide.Rev 1.0
The maximum number of simultaneous MODBUS requests the server can accept is one of the main characteristics of a MODBUS server. This number depends on the server design and its processing and memory capabilities. This implementation parameter is called "NumberMaxOfSeverTransaction" and must be described as one of the MODBUS server features. It may have a value from 1 to 16 depending on the device capabilities. The behavior and the performance of the MODBUS server are significantly affected by the "NumberMaxOfTransaction" parameter.
Iddle [Server init] Wait [Invocation to User application done] [MB Indication discarded] Invoke back end interface [Response from user Application] [Reception of a MODBUS indication from TCP Mgt] [MB Transaction refused] MODBUS_PDU_Checking... [MODBUS transaction accepted] [Processing not complete] [Need user Application processing] MODBUS_Service_Processing Response processing [Processing NOK] [Processing Not OK] [Processing OK] [Processing OK] Build a MODBUS response Build a MODBUS Exception [MB Exception OK] [MB Response OK] Send response to TCP_Mgt [processing end] Release the MODBUS server transaction Figure 15: Process MODBUS Indication activity diagram As shown in the previous activity diagram: § Some services can be immediately processed by the MODBUS Server itself, with no direct interaction with the User Application ; § Some services may require also interacting explicitly with the User Application to be processed ; § Some other advanced services require invoking a specific interface called MODBUS Back End service.
2 MODBUS PDU Checking The following diagram describes the MODBUS PDU Checking activity. Parse the MBAP header MB Indication discarded [Error on MBAP ] [MBAP OK] Instanciate a MB Transaction [No Transaction av ailable] [Transaction av ailable] Parse The MB PDU [Error on MB PDU] MB Transaction refused [OK] MB Transaction accepted Figure 16: MODBUS PDU Checking activity diagram The MODBUS PDU Checking function consists of first parsing the MBAP Header. The Protocol Identifier field has to be checked : § If it is different from MODBUS protocol type, the indication is simply discarded.