Rockwell Automation 2711P Creating Modbus Applications - Manual (Page 78)

Publication 2711P-UM002B-EN-P - March 2007
78 Modbus (RTU) Serial Address Definitions
Internal Registers Defaults are shown in bold.
Arrays
Arrays are also supported for the internal register addresses. The
syntax for declaring an array (using decimal addressing) is 3xxxx[cols]
with assumed row count of 1 and 3xxxx[rows][cols].
For Word, Short and BCD arrays, the base address + (rows * cols)
cannot exceed 65536.
For Float, DWord, Long and Long BCD arrays, the base address +
(rows * cols * 2) cannot exceed 65535.
For all arrays, the total number of registers being requested cannot
exceed the internal register block size that was specified for this
device.
Internal Registers (Function Code 04)
Decimal Addressing Hexadecimal Addressing
Type Word, Short, BCD
Format 3xxxxx H3yyyyy
Security
Read only
(1)
(1)
For unsolicited device 127.0.0.1.0, these locations are Read/Write.
Range 300001 - 365536 H300001 - H310000
Type Boolean
Format 3xxxxx.bb H3yyyyy.c
Security
Read only
(1)
Range 3xxxxx.0 - 3xxxxx.15 H3yyyyy.0 - H3yyyyy.F
Type Float, DWord, Long, LBCD
Format 3xxxxx H3yyyy
Security
Read only
(1)
Range 300001 - 365535 H300001 - H3FFFF