R3-NM1
P. 5 / 7
EM-8354 Rev.4
MODBUS I/O ASSIGNMENTS
TRANSMISSION DATA ASSIGNMENTS
The DIP SW located at the side of the module specifies each I/O module’s data allocation (occupied data area).
For example, when the data areas are assigned as shown below:
Module 1
4
Module 2
4
Module 3
4
Module 4
1
Module 5
1
Module 6
1
Module 7
1
Then the I/O data are assigned as in the table below:
ADDRESS
POSITION
Input Registers (3X)
1 – 4,
257 – 264
Slot 1
Holding Registers (4X)
5 – 8,
265 – 272
Slot 2
9 – 12,
273 – 280
Slot 3
13,
281 – 282
Slot 4
14,
283 – 284
Slot 5
15,
285 – 286
Slot 6
16,
287 – 288
Slot 7
ADDRESS
POSITION
Coil (0X)
1 – 64
Slot 1
Inputs (1X)
65 – 128
Slot 2
129 – 192
Slot 3
193 – 208
Slot 4
209 – 224
Slot 5
225 – 240
Slot 6
241 – 256
Slot 7
For Coil (0X) and Inputs (1X), addresses 16 times assigned
data areas (Data Allocation Type) are allotted with the Data
Allocation Type ‘1’ and ‘4.’ With ‘8’ and ‘16,’ 64 (4
×
16) are
automatically assigned.
ADDRESS
DATA FORMAT NAME
Coil (0X)
1 – 1024
Digital Output (discrete output)
1025
Main / Sub Switching Command (valid only with SW3-3 set to ON)
Inputs (1X)
1 – 1024
Digital Input (discrete input)
1025 – 1040
Module Status
1041 – 1056
Error Status
1057 – 1072
Data Error Status
Input Registers (3X)
1 – 256
I
Analog Input
257 – 768
F
Analog Input
Holding Registers (4X)
1 – 256
I
Analog Output
257 – 768
F
Analog Output
I : Integer, 0 – 10000 (0 – 100%)
F : Floating (32-bit data cannot be accessed using floating addresses.)
Note: DO NOT access addresses other than mentioned above. Such access may cause problems such as inadequate operation.
• Module Status indicates whether individual I/O module are mounted or not. The bit corresponding to the mounted slots
turns to “1,” and the unmounted slots to “0.”
• Error Status indicates error status for each module as described below. The bit corresponding to such modules turns to
“1.”
R3-TSx, R3-RSx, R3-US4: Input burnout
R3-DA16A:
Power input in error or disconnected
R3-YSx:
Output current error (e.g. load unconnected)
• Data Error Status indicates overrange (R3-US4: out of -10% to +110%; the other types: out of -15% to +115%) status for each
module. The bit corresponding to such modules turns to “1.”
• Main / Sub Switching Commands given to the network modules result as follows:
MAIN’ MODULE
‘SUB’ MODULE
OUTPUT MODE
1
0
Main bus is used; Red light turns on at RUN LED of the I/O modules.
0
1
Sub bus is used; Green light turns on at RUN LED of the I/O modules.
1
1
Main bus is used; Amber light turns on at RUN LED of the I/O modules.
0
0
Output is invalid; RUN LED of the I/O modules turns off.
