IDEC High Performance Series - Manual (Page 35)

WindO/I-NV2 User’s Manual 2-5
1 WindO/I-NV2 Specifications
2
WindO/I
-NV2 F
eatures & B
asic Oper
ations
●
Indirect Read and Indirect Write Settings
The indirect specification of a device address means to add a value (indirect value) to the address of the set device
and use that address as the actual read source or write destination. You can change the read source or write
destination address just by changing this indirect value.
Indirect read
Add the indirect value to the address of the device set as the read source and read the indirectly specified device
value.
Example: To read an indirectly specified device value into LDR200
When the device set as the read source is LDR10 and the indirect value’s device address is D21, if 4
(indirect value: 4) is set in D21, the device address of the value actually read is LDR14.
Indirect write
Add the indirect value to the address of the device set as the write destination and write to the indirectly specified
device value.
Example: To write the value in LDR20 to an indirectly specified device
When the device set as the write destination is LDR100 and the indirect value’s device address is D20, if 3
(indirect value: 3) is set in D20, the device address of the value actually written is LDR103.
Parts you can indirectly read and indirectly write
Device set as read source
Device with actually read value
Indirect value’s device
200 LDR11
300 LDR12
100 LDR10
500 LDR14
4 D21
500 LDR200
4 words
Indirect value
Read
LDR13 400
200 LDR101
300 LDR102
100 LDR100
1000 LDR103
3 D20
1000 LDR20
3 words
Indirect value
Device set as write source
Device with actually written value
Indirect value’s device
Write
Part Indirect read Indirect write
Word Button YES YES
Multi-Button YES YES
Numerical Input YES YES
Character Input YES YES
Numerical Display YES NO
Word Write Command YES YES
Script Command YES YES
Multi-Command YES YES
• Enter the value for indirect values as the data type BIN16 (+). Indirect values can be set in the range of
0 to 32767. If you enter a value for the indirect value outside this range, the value before the indirect
value changes is maintained when reading. When writing, “Device range error” is displayed.
In scripts however, enter a value for the data type set in the script.
• For indirect device reading, decide the read source address after the indirect value changes and after the
screen changes, and then read the device value. For host devices, communication to read the device value
from a host device takes time, so if data is transfered or arithmetic operations are executed before the
indirect read is finished, processing cannot be executed and the following error is displayed.
Word Button, Word Write Command: Indirect device error
Script Command: Script error