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Chapter 4
Basic functions and System configuration
4.2.4
Correspondence of occupied channels and I/O slots (Normal remote method)
In the case of normal remote method I/O data are stored in occupied channels according to I/O assignment for
remote base as showing in Figure 4.5. One channel corresponds to one slot because only either of them is used
among I/O in one channel. It is allocated from the order with small channel number since slot No.0 of the slave
base. Maximum 8 I/O modules can be mounted on the one slave base.
I/O assignment for
CPU
CPU
I/O refresh
4.2.5
Compression mode of slave module (4W/4W method)
In the case of 4W/4W method CPU module stores I/O data in occupied channels of master module as shown in
Figure 4.6. Data is stored in both the input and the output in one channel unlike a normal remote method. The
compression mode of slave is a mode that compresses the data of the occupied slots and the image slots into half
the occupied channels of the number of slots to correspond to this as shown in Figure 4.6. Therefore, you can use
image slots of the same number as the occupied slots. It is allocated from the order with small channel number
since slot No.0 of occupied slots of the slave base. It is allocated from the order with small channel number since
slot No.2 of image slots of the slave base. Only input modules are mounted on the occupied slots, and only output
modules are mounted on the image slots of slave base. The output module installed in the occupied slot doesn't
operate.
I/O assignment for
remote base
Unnessesary
（Remote I/O No. is
determined by
mounted slot No. of
master module）
CPU
CPU
I/O refresh
Figure 4.6 Correspondence of occupation channels and I/O slots in slave with compression mode (4W/4W method)
remote base
Occupied channels of master
Channel
Input
Output
No.
－
0
X10000～
－
1
X10100～
－
2
Y10200～
－
3
Y11000～
－
4
Y11100～
5
－
X11200～
－
6
X11300～
－
7
Y11400～
Figure 4.5 Correspondence of occupied channels and I/O slots
Occupied channels of master
(Example of master is mounted on slot 2)
Channel
Input
Output
No.
0
X200～215
Y264～279
1
X216～231
Y280～295
2
X232～247
WY26
3
X248～263
WY27
Occupied channels of slave
St.No.0
Channel
Input
No.
0
X10000～
Remote
1
X10100～
communication
－
2
Image slot (Output module only)
Occupied slots (Input module only)
Occupied channels of slave St.No.0
Channel
Input
No.
Remote
Communication
0
X200～215
1
X216～231
Compression mode of slave: ON
（Slave compresses 4slots to 2channels）
4 – 4
Slot No.
0 1 2
X
X
16
16
Slave I/O
Output
refresh
－
－
Y10200～
Slot No.
0 1 2
X
X
16
16
Output
Y264～279
Y280～295
Slave I/O
refresh
Y
16
Y
16
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