R3-NM4
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-8331 Rev.4 P. 6 / 8
MODBUS I/O ASSIGNMENTS
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 modules are mounted or not. The bit corresponding to the mounted slot
turns to “1,” and the unmounted slot to “0.”
• Error Status indicates error status for each module as described below. The bit corresponding to such module 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)
R3-PC16A: External power supply in error or disconnected
• 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 module 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.
TRANSMISSION DATA ASSIGNMENTS
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
ADDRESS
POSITION
Input Registers (3X)
Holding Registers (4X)
1 – 4, 257 – 264
Slot 1
Coil (0X)
Inputs (1X)
1 – 64
Slot 1
5 – 8, 265 – 272
Slot 2
65 – 128
Slot 2
9 – 12, 273 – 280
Slot 3
129 – 192
Slot 3
13, 281 – 282
Slot 4
193 – 208
Slot 4
14, 283 – 284
Slot 5
209 – 224
Slot 5
15, 285 – 286
Slot 6
225 – 240
Slot 6
16, 287 – 288
Slot 7
241 – 256
Slot 7
For Coil (0X) and Inputs (1X), addresses 16 times assigned data areas (Data Allocation Type) are allotted with the Data Al-
location Type ‘1’ and ‘4.’ With ‘8’ and ‘16,’ 64 (4 × 16) are automatically allotted.
