Toshiba VF-A7 Instruction Manual

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3210.8 Performance TipsThis section offers several configuration tips which can help to optimize theperformance of communications with the ETH-100 and attached drives.1. Configure Modbus programmable pointer registers to also be drive scanregisters. In the example configuration shown in Table 3, Modbus registersFC00 ~ FC07 are configured to point to the ASD scan registers. In this case, aModbus transaction beginning at address FC00 with a length of 8 can beprocessed extremely fast. Of course, pointer registers can still be accessed ifthey are not configured as scan registers, but the transactions are slower, as theyrequire transferring the request to the drive for processing.Table 3: Efficient Scan/PPR ConfigurationASD Scan Registers Modbus Pointer RegistersRegister R/W Value Register Points ToÖFA01 Read FC00 FA02FA00 Read FC01 FA01FD00 Read FC02 FD01FE01 Read FC03 FE02FC90 Read FC04 FC91FE03 Read FC05 FE04FE42 Read FC06 FE43FA22 Read FC07 FA232. Donít leave a gap in the access sequence. For optimal network response,make sure all of the pointer registers that you are going to access are alsoconfigured to be ASD scan registers. The ETH-100 is most effective when all ofthe pointer registers that are going to be accessed are also ASD scan registers.In the example shown in Table 4, the high-speed processing of a Modbus registerread starting at register 0xFC00 with a length of 8 will be delayed by the necessityto interact with the drive to obtain the values of drive registers 0xFC90 and0xFE03.Table 4: Inefficient Scan/PPR ConfigurationASD Scan Registers Modbus Pointer RegistersRegister R/W Value Register Points ToÖFA01 Read FC00 FA02FA00 Read FC01 FA01FD00 Read FC02 FD01FE01 Read FC03 FE02FC04 FC91FC05 FE04FE42 Read FC06 FE43FA22 Read FC07 FA23