GE PACSystems RXi User Manual page 160

Applicable Functions
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Translating %W Reference Addresses
To find the PACSystems %W memory address equivalent of a Modbus File and Record:
To find the Modbus File and Record equivalent of a PACSystems %W memory address:
Modbus Holding Register Table
The Modbus Holding Register table is mapped exclusively to the CPU Register (%R) table.
Applicable Functions
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Read Multiple Registers
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Write Multiple Registers
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Write Single Register
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Mask Write Register
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Read/Write Multiple Registers
Modbus Input Register Table
The Modbus Input Register table is mapped exclusively to the CPU Analog Input (%AI) table.
Applicable Functions
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Read Input Registers
Modbus Input Discrete Table
The Modbus Input Discrete table is mapped exclusively to the CPU Discrete Input (%I) table.
Applicable Functions
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GFK-2816F
Chapter 8. Gigabit Ethernet (GbE) Interface Overview and Operation
Read File Record
Write File Record
%W = 10,000 (F-1) + R
W-1
File = + 1
10,000
Record = W – (10,000 (F – 1))
If you use the Modbus function Write File Record, and
specify multiple record sections, the first N-1 sections will
be written to the server's Controller reference memory, even
if an error prevents the writing of the last section.
Read Input Discretes
(Discard any fractional portion;
round the result downward to
the next integer value).
Caution
August 2015 147