Quatech INTERBUS S manual Structure of the in- and output data for Modbus from firmware

Structure of the in- and output data for Modbus (from firmware V2.3)

The module is a combined special function input and output module with 2 x 16 Bit in- and output data.

Input

Word

n(Bit0-Bit15) n+1 (Bit16-Bit31)

Description

High

Input byte0

Input byte2

Low

Input byte1

Input byte3

Output

Word

n(Bit0-Bit15) n+1 (Bit16-Bit31)

Description

High

Output byte0

Output byte2

Low

Output byte1

Output byte3

Attention:

For Interbus S the data is written in Motorola format (high Byte first). In connection with other fieldbus systems the Bytes in the data word are changed.

Attention:

The control byte allows the changing of the registers of the module. It must always be 0 in order to avoid a change in the registers. A wrong mapping can change the function of the module!

Data￿￿￿￿￿￿￿￿exchange module 750-654 5

￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿:$*2Ç,￿2Ç6<67(0