GE PACSystems RXi User Manual page 184

(Word 10) Local Controller Memory Type: Words 10-11 specify the location in the local controller
where the Ethernet interface will store data received from the remote device. Valid values for
Word 10 are listed below.
Type
%W
%R
%AI
%AQ
%I
%Q
%T
%M
%SA
%SB
%SC
%S
%G
(Word 11) Local Controller Memory Address: Word 11 determines the starting address in
the local controller in which the data from the remote device is to be stored. 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. Be sure this area is large enough to contain the requested data without
overwriting other application data.
(Word 12) Remote Device Address: Word 12 specifies the address in the remote Modbus
TCP device.
Note:
(Word 13) Number Registers in Remote Device: Words 13 specifies the quantity of
registers (16bit words) to read from the remote device.
(Word 14) 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.
7
Read-only memory, cannot be written to.
GFK-2816F
Chapter 8. Gigabit Ethernet (GbE) Interface Overview and Operation
Value
(Decimal) Description
196 Word memory (word mode)
8 Register memory (word mode)
10 Analog input memory (word mode)
12 Analog output memory (word mode)
16 Discrete input memory (byte mode)
70 Discrete input memory (bit mode)
18 Discrete output memory (byte mode)
72 Discrete output memory (bit mode)
20 Discrete temporary memory (byte mode)
74 Discrete temporary memory (bit mode)
22 Discrete momentary internal memory (byte mode)
76 Discrete momentary internal memory (bit mode)
24 Discrete system memory group A (byte mode)
78 Discrete system memory group A (bit mode)
26 Discrete system memory group B (byte mode)
80 Discrete system memory group B (bit mode)
28 Discrete system memory group C (byte mode)
82 Discrete system memory group C (bit mode)
7
30 Discrete system memory (byte mode)
84 Discrete system memory (bit mode)
56 Discrete global data table (byte mode)
86 Discrete global data table (bit mode)
The function code determines the Modbus server address area, Word 12 is the
address within this area.
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