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DATA DESCRIPTIONS
The DIP SW located at the side of the module switches the unit's data allocation mode.
In the Data Allocation Mode 1, one (1) word is assigned per module. The second channel of analog I/O modules cannot be used.
Max. 16 I/O modules can be connected in this mode.
In the Data Allocation Mode 2, two (2) words are assigned per module regardless of whether the second word area is required
or not, even for discrete I/O modules that reguire one (1) word.
Max. 32 I/O modules can be connected in this mode.
Each Status data is available when the Ready is "1" (the internal bus in normal condition). While the Ready is "0," all of the
Status data is "0" (the internal bus in abnormal condition).
■ DATA ALLOCATION MODE 1
• Output Data
The figure below shows the allocation of data sent from
the power / network module to the master.
Module
15
0
RWr n+0
1
+2
2
3
+4
4
5
+6
6
7
+8
8
9
+10
10
11
+12
12
13
+14
14
15
+30
30
31
16 × m (m = cyclic expansion setting) data areas are available for the R8-NC3.
In Data Allocation Mode 1, set Cyclic Expansion two (2). When Cyclic Expansion setting is 4, data of module address 32 or
larger is invalid.
Field input data is set in the module's output data area. The input data area is also secured though not used for an input
module.
• Module Status
RX (n+0) 0 through RX (n+1) 15 indicate that modules are mounted in each slot.
15
RX(n+0)
• Ready Signal
When cyclic expansion is "2", RX (n+13) 11 is assigned to Ready signal, which turns to "1" when the internal bus is in normal
conditions.
• Input Data
The figure below shows the allocation of data sent from
the master to the power / network module.
0
RWw n+0
0
RX(n+1)
Module 0
Module 1
Module 2
Module 15
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: + 81 ( 6 ) 6659-8201 Fax: + 81 ( 6 ) 6659-8510 E-mail: info@m-system.co.jp
Module
15
0
1
+2
2
3
+4
4
5
+6
6
7
+8
8
9
+10
10
11
+12
12
13
+14
14
15
+30
30
31
15
R8-NC3
0
0
Module 16
Module 17
Module 18
Module 31
EM-9726 P. 5 / 7
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