GE PACSystems RXi User Manual page 193

Chapter 8. Gigabit Ethernet (GbE) Interface Overview and Operation
(Word 11) Local Controller Starting Address LSW (Write With Data Read From Server): Word 11
determines the least significant word (LSW) of the starting address in the local controller from
which the data is to be written. The value entered is the offset (1-based) from the beginning
of controller memory for the memory type and mode specified in Word 10. This offset will be
either in bits, bytes, or words depending on the mode specified. Valid ranges of values
depend on the controller's memory ranges.
(Word 12) Local Controller Starting Address MSW (Write With Data Read From Server): Word 12
determines the most significant word (MSW) of the starting address in the local controller
from which the data is to be written. This value will typically be 0 unless the address is above
65535 for %W memory.
(Word 13) Remote Device Read Address: Word 13 specifies the register(s) to read from the remote
Modbus TCP device.
(Word 14) Number Registers to Read From Remote Device: Words 14 specifies the quantity of
registers to read from the remote device.
(Word 15) Local Controller Memory Type (Read Data to Write to Server): Words 15–17 specify the
location in the local controller where the Ethernet interface will read data to use for writing to
the remote server. Values for Word 15 are listed on page ICRXICTL000, GFK-2816,
GFK2816171. The value 8 specifies Register Memory %R.
(Word 16) Local Controller Starting Address LSW (Read Data to Write to Server): Word 16 determines
the least significant word (LSW) of the starting address in the local controller from which the
data is to be read. The value entered is the offset (1-based) from the beginning of controller
memory for the memory type and mode specified in Word 15. This offset will be either in bits,
bytes, or words depending on the mode specified. Valid ranges of values depend on the
controller's memory ranges.
(Word 17) Local Controller Starting Address MSW (Read Data to Write to Server): Word 17 determines
the most significant word (MSW) of the starting address in the local controller from which the
data is to be read. This value will typically be 0 unless the address is above 65535 for %W
memory.
(Word 18) Remote Device Write Address: Word 18 specifies the register(s) to be written on the
remote Modbus TCP device.
(Word 19) Number Registers to Write To Remote Device: Words 19 specifies the quantity of registers
to write to the remote device.
(Word 20) Unit Identifier: This field is typically used by Ethernet to Serial bridges to specify the
address of a Modbus Slave on a multi-drop link. The Modbus TCP Unit Identifier is a special
control code used in a Modbus TCP message block.
180 PACSystems* RXi Distributed IO Controller User Manual GFK-2816F