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Response:
ADDRESS
fUnC-
TIOn
nO. ByTES SLAVE ID
RUn STA-
TUS
CRC
100
17
2
4
255
18, 116
4.3.5 EXCEPTIOn RESPOnSE
With an incorrect inquiry an Exception Response is transmitted and the
inquiry is rejected.
ILLEGAL fUnCTIOn:
The function code received in the inquiry is not sustained by the slave.
ILLEGAL DATA ADDRESS:
The register address does not exist. It must be smaller than 1152. With
the inquiries „Read holding Registers” and „Preset Multiple Regs” the
address comprises the register’s start address and the number of registers. So
that the following applies
Re number <1152; 128+8x128.
ILLEGAL DATA VALUE:
The data in the inquiry are not permitted. for example the number of
registers to be read is too high (max. 120).
4.4 REGISTER ALLOCATIOn
The registers are split up into the following areas:
PARAMETERS
REGISTER ADDRESSES
J-BUS
MODBUS
Bus module
0 - 127
40001 - 40128
Controller X1
128 - 255
40129 - 40256
Controller X2
256 - 383
40257 - 40384
Controller X3
384 - 511
40385 - 40512
Controller X4
512 - 639
40513 - 40640
Controller X5
640 - 767
40641 - 40768
Controller X6
768 - 895
40769 - 40896
Controller X7
896 - 1023
40897 - 41024
Controller X8
1024 - 1151
41025 - 41152
TAB. 3 REGISTER ALLOCATIOn Of ThE BUS MODULE fOR J-BUS AnD MOD-
BUS RTU