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4.4 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
order from smaller to larger node addresses. For example, in Table 4.11, Slave Device
Configuration, the input data area/output data area is allocated to the top and the subsequent
addresses without skipping, as shown in Figure 4.8. Allocation will be executed when run mode
(transmission state enabled) is set by an operation mode control request after setting slave device
parameters.
Table 4.11 Slave Device Configuration (sample)
Node address Transmission size Reception size
10 2 bytes 4 bytes
11 4 bytes 2 bytes
12 6 bytes 6 bytes
20 3 bytes 4 bytes
30 4 bytes 1 byte
40 4 bytes 6 bytes
Output data area Input data area
F· · · · · · · · · · · · · · · · 0 F· · · · · · · · · · · · · · · · 0
0080H NA = 10 0000H
0081H 0001H
NA = 10
0082H
NA = 11
0002H NA = 11
0083H 0003H
0084H NA = 12 0004H NA = 12
0085H 0005H
0086H NA 0006H
0087H No allocation = 20 0007H
NA = 20
0088H 0008H No allocation NA = 30
0089H
NA = 30
0009H
008AH 000AH NA = 40
008BH
NA = 40
000BH
Figure 4.8 Input/Output Data Area in Slave Device Configuration (sample)
CAUTION
1. When a slave device has odd transmission/reception bytes in size, the actual size plus 1
byte are allocated in the DN211 input/output area.
2. When you add a new slave device, enter a new value larger than the node addresses of the
present slave devices. For Figure 4.8, enter a value larger than "41"for the node address of a
new slave. If the node address of a new slave device is set to "18", allocating data area of
node addresses 20/30/40 will be shifted.
3. Don't change the input/output data size for slave devices (FLEX-I/O, etc.) which are flexible in
data allocation size. If changed, the slave devices with a node address larger than that of the
slave device changed data size will be shifted in their data allocation.
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