Safety Considerations Guide, Tricon v9.0 - Tuv-fs.com

70 Data Transfer TimeData Transfer TimeThe Peer-to-Peer function blocks require multiple scans to transfer data from thesending node to the receiving node. The time it takes to transfer data depends onthe following parameters of the sending and receiving nodes:• Scan time• Configuration size• Amount of aliased data• Number of TR_USEND function blocks, TR_URCV function blocks, printfunction blocks, and Modbus master function blocks• Number of nodes on the peer-to-peer networkTo estimate the data transfer time, first calculate the number of bytes for aliasedvariables according to the instructions that follow.▼To calculate the number of bytes for aliased variables:1 On the Tricon menu, select Edit Configuration. This will display theconfiguration tree.2 Click Memory Allocation under Tricon System Configuration on theconfiguration tree.This will display the Memory Allocation dialog box to the right of theconfiguration tree. The display gives the allocation for Unaliased, Read Aliased,and Read/Write Aliased Memory points, and if you scroll down you can see theallocation for Input points and Output points. For each data type (BOOLs,DINTs, and REALs), you can see the Maximum, Allocated, Forecast, andCurrent number of variables. The number you need is Allocated.3 Total the number of allocated “Aliased” BOOLs, DINTs and REALs.4 The number of bytes for aliased variables is 376 + BOOLs/8 + DINTs*4 +REALs*4.The basic formula for estimating the data transfer time is as follows:Data transfer time in milliseconds =2 * (larger of TS or SS) + 2 * (larger of TR or SR)Tricon Safety Considerations Guide