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Advanced Configuration Features

31004624 8/2009 107

A Modbus View of the Island’s Data Image

Summary

A block of Modbus registers is reserved in the NIM to hold and maintain the island’s

data image. Overall, the data image holds 9999 registers. The registers are divided

into contiguous groups (or blocks), each dedicated to a specific purpose.

Modbus Registers and Their Bit Structure

Registers are16-bit constructs. The most significant bit (MSB) is bit 15, which is

displayed as the leftmost bit in the register. The least significant bit (LSB) is bit 0,

displayed as the rightmost bit in the register:

The bits can be used to display operating data or device/system status.

Each register has a unique reference number, starting at 40001. The content of each

reference and its assignment in the control logic program remain constant.

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 169 170

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Schneider Electric INTERBUS Basic Spezifikationen Seite 107