Modbus Tcp/Ip; Drive Channel Access; Supported Modbus Functions - Toshiba VF-A7 Instruction Manual

Ethernet communications interface for the toshiba 7 series and 9 series adjustable speed drives

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10. Modbus TCP/IP

The ETH-100 interface supports Schneider Electric's Modbus TCP/IP protocol,

release 1.0. The ETH-100 is conformance class 0 and partial class 1 compliant, and

allows up to 8 simultaneous Modbus TCP/IP client connections (sockets). Socket

timeouts are set to 30s, which means that if a particular open socket experiences no

activity for more than 30s, then the interface assumes that the client has experienced

some sort of unexpected problem, and the ETH-100 will close that socket.

Each specific drive channel (Channel A, Channel B and Channel C) is accessed via

the "Unit Identifier" (UI) field of a Modbus TCP/IP packet. Drive channel A is

accessed when the UI field is set to "1", channel B is accessed when the UI field is

set to "2", and channel C is accessed when the UI field is set to "3". Any other UI

setting is invalid and will result in a GATEWAY PATH UNAVAILABLE exception

(Modbus TCP/IP exception code 0A).

The ETH-100 interface supports the Modbus TCP/IP function codes indicated in

Table 1.

Table 1: Supported Modbus TCP/IP Functions

Function Code

Read multiple registers

Write single register

Write multiple registers

Function

Class

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Eth-100