Toshiba T300MVi User Manual download pdf (Page 55)

corresponding input register in the range of 1..9999 will be accessed.

Otherwise, a holding register of the same index as the assigned “register”

index will be accessed.

9999

10000

30001

39999

40000

30000

65535

Holding Register

Accessed

Point’s “Register”

Assignment

65535

30000

30001

39999

40000

Input Register

Accessed

CCESSIBLE

OLDING

NPUT

OLDING

Figure 29: "Register" Assignment and Resulting Register Type Accessed

• Input (3X) registers are read-only. Attempts to write to a point associated

with an input register will result in an exception.

15.1.4 Modbus TCP/IP Slave

The interface supports Schneider Electric’s Modbus TCP/IP protocol, release

1.0. The unit is conformance class 0 and partial class 1 and class 2 compliant,

and allows up to 4 simultaneous Modbus TCP/IP client connections (sockets).

• The “unit identifier” (UI) field of the request packets is ignored.

• Standard 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 or network has experienced some sort of

unexpected problem, and the interface will close that socket.

• A “master” IP address and timeout time can be assigned to the unit. Each

point defined in the point database has the capability to be assigned an

optional failsafe timeout value. When an unexpected socket failure from

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Toshiba T300MVi User Manual Page 55