Shift Function - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Precautions
• When the scaling function is used, the unscaled digital value can be set to a value out of the range between the scaling
upper and lower limit values (dashed line portion of output characteristics)". However, use it within the analog output
practical range (solid line portion of output characteristics). If the analog output practical range is exceeded, the maximum
resolution or the accuracy may go out of the specification.
• Depending on the scaling function setting, the default digital value "0" may be inappropriate. Particularly for an example of
the output range 0 to 5 V, if 'CH1 Output enable/disable flag' (Un\G70, b1) turns on with the digital value set to "0", a digital
value out-of-range error will occur. A digital value setting range error occurs (error code: 191H) occurs, ''Error flag'
(Un\G69, b15) turns on, and the ERROR LED turns on. To avoid this, set a proper digital value within the scaling range
before turning on 'CH1 Output enable/disable flag' (Un\G70, b1).
• Note that use of the user range results in "scaling lower limit value = offset value".
• If a scaling converted digital value falls outside the digital setting range when the scaling function is enabled, a digital value
setting range error (error code: 191H) occurs and the check code is stored in 'CH1 Set value check code' (Un\G400).
• The scaling function is enabled only for normal output. If the scaling function is enabled while the wave output function is in
use, a wave output mode scaling setting error (alarm code: 0B1H) will occur and 'Warning output signal' (Un\G69, b14)
turns on.
• Use the setting range of the scaling upper and lower limit values in the range of -2147483648 to +2147483647 only when
only when performing the same operation as the FX3U-4DA offset/gain function. For other than the FX3U-4DA Offset/gain
setting function, use it in the range of -32000 to +32000 because the digital value exceeds this range.

Shift function

Adds the set input value shift amount to the digital input value.
A change in input value shift amount is reflected to the analog output value in real time, which facilitates fine adjustment at
system start-up.
Operation
During digital value D/A conversion, the value obtained by adding 'CH1 Input value shift' (Un\G480) to 'CH1 Digital value'
(Un\G460) is D/A-converted.
If the shift processing produces a calculated digital value exceeding the range of -32768 to +32767, the lower (-32768) and
upper (+32767) limit values are fixed.
If the value is written into the 'CH1 Input value shift (Un\G480), the setting value will be added to the digital input value
regardless of whether 'Operating condition setting request' (Un\G70, b9) is on or off.
Setting procedure
In 'Input value shift amount', set the amount by which to shift.
[Navigation window]  [Parameter]  [Module Information]  Module model name  [Module Parameter] 
[Application setting]  [Shift function]
Item
Input value shift amount
Setting range
-32768 to +32767
2
2 FX5-4DA
191
2.4 Functions