4.4
I/O Module (Optional) Connections
4-59
( 8 ) Offset and Gain Setting
Normally the offset/gain setting need not to be adjusted since the AI-01 Module has been adjusted
before shipment so that the register input value according to the specified voltage (current) is input.
If more fine adjustment is required, use the following procedure to set the offset and gain.
1.
Select the channel in the AI-01 Configuration Window and click Set - Offset/Gain.
The Set Offset/Gain Dialog Box will be displayed.
2.
While increasing the voltage of external device from 0V to 5V, and to 10V (for 0 to 10V
input mode), adjust the Offset value and Gain value in the Set Offset/Gain Dialog Box
checking the current value (Current) value of the AI-01. When the values are decided,
click the OK Button.
3.
Repeat the steps 1 and 2 to set the offset and gain for the required channels.
The value calculated using the data (A/D converted value) from the AI-01 Module and the set
offset and gain values is stored in the input register (I register):
Input register value
＝
A/C converted value
×
Gain
＋
Offset
The offset and gain default values are as follows.
Offset:
0000
Gain: 1.000
Therefore, if no offset/gain adjustment is performed, the input register value is equal to the A/
D converted value.
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