9 Modbus RTU – integrated Modbus port specification
9.3 Modbus register map
PXR Electronic trip unit 01/21 MN012005EN www.eaton.com 71
9.3.5 Block of registers
The data object registers of an Eaton product can be rearranged by setting up
a block of registers based on the register column in ￫ table 26, page 61.
The block of registers is stored in the non-volatile memory.
Function code 16 will load the object assignments for the block of registers.
The block assignments are stored starting with registers 401001/420481
(0x03E8/0x5000). Only the first register address of the data object is
assigned within the block. For example, although the data object “I
L1
(I
A
)”
occupies registers 0x1202 and 0x1203, only register 0x1202 will be loaded
into the assigned block of registers. The verification of this block of assigned
registers can be read by the release from the registers 401001/420481
(0x03E8/0x5000) using the function codes 03 or 04.
The data of the objects configured in the assigned block of registers are
mapped to the registers starting with 401201/420737 (0x04B0/0x5100) and
continue successively for each assigned object. The number of objects and
their order in this data block depends on the configuration of the assigned
block of registers. The total number of data blocks in the registers is limited
to 100.
The data can be obtained from the data block of the registers by reading
function codes 03 or 04. The address of the start object must match the start
address of an object in the data block of the registers. The number of
registers to be obtained must match the end address of an object within the
data block of the registers.
Table 33: Configuration register
Definition of the register
R/W Modbus register number Modbus register address Number
Low High Low High
Assigned block of the register configuration R/W 401001 420481 0x03E8 0x5000 100
Assigned block of register data
R 401201 420737 0x04B0 0x5100 100 x 2
Invalid object access configuration
R/W 402001 425345 0x07D0 0x6300 1
Configuration of the word order of floating-point data
R/W 402002 425346 0x07D1 0x6301 1
Configuration of the word order of fixed-point data R/W 402003 425347 0x07D2 0x6302 1
Remote control R/W 402901 425089 0x0B54 0x6200 3
Time and date register R/W 402921 0x0B68 8
To Next Page
Loading...
