Table of Contents
Advertisement
4 PROCEDURES AND SETTINGS BEFORE OPERATION
4.6 Fine Adjustment of the Offset /Gain Values
4.6.1 Fine adjustment methods of the offset/gain values
Fine adjustment of
the offset value.
Fine adjustment of
the gain value.
4 - 10
Offset/gain values are set by selecting an I/O characteristic, which is preset using the
analog input/output range switch setting pins.
Each module will have slight characteristic differences from the I/O characteristic
selected by the analog input/output range switch setting pins due to the ambient
temperature, characteristic variances of the A/D conversion module, and so on.
Offset/gain fine adjustment is performed to correct such slight differences in
characteristics.
The following flow chart describes the fine adjustment procedure of the offset/gain
value of A1s66ADA. This setting is for when the module is installed in the slot No. 0,
the D/A conversion to CH1 and A/D conversion to CH3.
(1) Fine adjustment procedures for the D/A conversion offset/gain
values
Adjust the analog output of the CH1 that corresponds to
the gain value using "D/A conversion gain control knob".
POINT
If the analog output range is set to -10 V to 10 V, and if a fine adjustment of the
offset value is performed by setting the offset value to 0 and the analog output to -
10 V, the analog output may shift slightly. In such cases, the offset value can be
set correctly in one attempt if fine adjustment of the offset value is performed by
setting the offset value to 2000 and the analog output to 0 V.
Start
Set the analog output range by using
the analog-output range switching setting pin.
Input the offset value to the
output signals Y00 to Y0B.
Turn on the CH1 D/A conversion
value output enable flag (Y0F).
Adjust the analog output of the CH1 that
corresponds to the offset value using
"D/A conversion offset control knob".
Input the gain value to the
output signals Y00 to Y0B.
End
MELSEC-A
4 - 10
Advertisement
Table of Contents
