Data Area - Toshiba 2000 V Series Manual

4.2.3 Allocating slave device data to the input/output data area
Reception/transmission data of slave devices will be allocated to the input/output data
area in the ascending order of node addresses. In the slave device configuration shown
in Table 4-11, for example, the node addresses are allocated to the input data area/output
data area from the top downward without skipping as shown in Figure 4-13.
Allocation begins when the module is set in run mode (transmission enabled) an
operation mode control request after setting slave device parameters.
0080H
0081H
0082H
0083H
0084H
0085H
0086H
0087H No allocation
0088H
0089H
008AH
008BH
Figure 4-13 Input/Output Data Areas in Slave Device Configuration (Sample)
1. When a slave device has a transmission/reception size in odd bytes, it will have an output/
input area of the actual size plus 1 byte.
2. In adding a new slave device, assign to it a greater value than the node addresses of the
present slave devices. In the case shown in Figure 4-13, assign a node address of 41 or
greater to a new slave device. If a node address of 18 is assigned to a new slave device, for
example, the allocated data of node addresses 20, 30 and 40 will deviate.
3. Don't change the data size once set of slave devices (FLEX-I/O, etc.) which are variable in
data input/output size. A change in their data size will cause deviations in the allocated data
of the slave devices whose node address is greater than that of the slave device whose data
size is changed.
6F8C0845
Table 4-11 Slave Device Configuration (Sample)
Node address
10
11
12
20
30
40
Output data area
F • • • • • • • • • • • • • • • O
NA=10
NA=11
NA=12
NA=20
NA=30
NA=40
Usage Recommendations
4.2 S Controller Interface Buffer Memory Configuration
Transmission size
2
bytes
4
bytes
6
bytes
3
bytes
4
bytes
4
bytes
Input data area
F • • • • • • • • • • • • • • • O
0000H
NA=10
0001H
0002H NA=11
0003H
0004H NA=12
0005H
0006H
NA=20
0007H
0008H No allocation
0009H
000AH NA=40
000BH
Reception size
4
bytes
2
bytes
6
bytes
4
bytes
1
bytes
6
bytes
NA=30
67
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