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239
C200H I/O Link Units
Section 6-1
Read/Write Reference Area
The current setting status of the Read Area and Write Area are indicated as
shown in the following diagram. (The Read/Write Area settings are not output
to this area unless the C200H I/O Link Unit is restarted after software switch
bit 00 is turned ON.)
Data is stored in these words in the same form as it is for the Read/Write Set-
ting Area. Refer to page 237 for details.
Setting the Read and Write
Areas
Use the following procedure to set the Read and Write Areas.
Using Control bits
This procedure uses the Read/Write Setting Area and the software switch in
the C200H I/O Link Unit’s Special I/O Area to set the Read and Write Areas.
1,2,3...
1.
Turn ON the power to the PLC to which the C200H I/O Link Unit is mounted
and set the PLC to PROGRAM mode.
2.
Using a Peripheral Device, such as a Programming Console, set the Read
Area and Write Area in the Read/Write Setting Area in Special I/O Area
words +2 to +4. Example: Read Area: IR 100 to IR 119, Write Area: DM
0160 to DM 0189.
3.
Using the Peripheral Device, turn ON software switch bit 00 in Special I/O
Area word +0 (Read/Write Area user settings). If it is already ON, turn it
OFF and then ON again.
4.
Check that Status Area bit 09 in Special I/O Area word +5 is ON (Read/
Write Area Setting Normal Completion Flag).
Note At this point, the Read/Write Area settings are written to memory in
the C200H I/O Link Unit, but they are not yet effective. Operation will
continue using the previous Read/Write Area settings. (The contents
of the Read/Write Reference Area will also remain at the previous
settings.)
5.
Reset the C200H I/O Link Unit, or restart the PLC to which the C200H I/O
Link Unit is mounted.
Note a) When the C200H I/O Link Unit is mounted in a C200HX/HG/HE
PLC, it can be reset by turning ON the corresponding Special I/O
Unit Restart Bit in AR 01 or SR 281. When the Unit is mounted in
a CS1H/G PLC, it can be reset by turning ON the corresponding
Special I/O Unit Restart Bit in A502 to A507.
b) When the Unit is restarted, the Read/Write settings will become
effective and the number of IN/OUT words for the C200H I/O Link
Unit will be set.
6.
Correct the C200H I/O Link Unit’s scan list registration in the Master’s scan
list. There are two methods of registering the scan list.
• Turn ON the Enable Scan List software switch on the Master Unit.
Bit 15
Bit 0
Current Write Area setting
Current Read Area setting
+ 6
+ 7
+ 8
+ 9
Write Area: 58 bytes, DM Area
Write Area: First word address 160
Read Area: 40 bytes, IR Area
Read Area: First word address 100
+ 1
+ 2
+ 3
+ 4
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