Rockwell Automation 2711P Creating Modbus Applications - Manual (Page 70)

Publication 2711P-UM002B-EN-P - March 2007
70 Modbus ASCII Address Definitions
Internal Registers Defaults are shown in bold.
Arrays
Arrays are also supported for the internal and holding 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
Decimal Addressing
Type Word, Short, BCD
Format 3xxxxx
Security
Read only
(1)
(1)
For unsolicited device 127.0.0.1.0, these locations are Read/Write.
Range 300001 - 365535
Type Boolean
Format 3xxxxx.bb
Security
Read only
(1)
Range 3xxxxx.0 - 3xxxxx.15
Type Float, DWord, Long, LBCD
Format 3xxxxx
Security Read only
Range 300001 - 365534