Schneider Electric 890USE17700 - Manual (Page 166)

Advanced Configuration Features
166 890USE17700 April 2004
The Data Image The 9999 contiguous registers in the Modbus data image start at register 40001.
The illustration below shows a graphical representation of the data image and how
it is subdivided into nine distinct blocks:
Block 1 output data process image (4096 registers available)
Block 2 fieldbus master-to-HMI output table (512 registers available)
Block 3 reserved (512 registers available)
Block 4 128-register block reserved for future read/write use
Block 5 54-register block reserved for future read/write use
Block 6 54-register block reserved for future read-only use
Block 7 35 predefined island bus status registers
Block 8 input data/status process image (4096 registers available)
Block 9 HMI-to-fieldbus master input table (512 registers available)
Each block has a fixed number of registers reserved for its use. Whether or not all
the registers reserved for that block are used in an application, the number of
registers allocated to that block remains constant. This permits you to know at all
times where to begin looking for the type of data of interest to you.
For example, to monitor the status of the I/O modules in the process image, look at
the data in block 8 beginning at register 45392.
44609
45120
512 registers Block 3
40001
44096
4096 registers Block 1
44097
44608
512 registers Block 2
45121
45248
Block 4 128 registers
45249
45302
54 registers Block 5
45356
54 registers
45303
45392
49487
4096 registers
Block 8
49488
49999
512 registers Block 9
Block 6
45391
35 registers
45357
Block 7