Mitsubishi MELSEC-Q series User Manual page 72

4
SETUP AND PROCEDURES BEFORE OPERATION
4
- 12 4.6 Offset/Gain Settings
*1 The mode switching (normal mode to offset/gain setting mode to normal mode) method is given
below.
• Dedicated instruction (G(P).OFFGAN)............................Refer to Section 4.6 (2), (a)
• Setting made to mode switching setting (Un\G158, Un\G159) and turning the operation
condition setting request (Y9) from OFF to ON .......Refer to Section 4.6 (2), (b)
•Intelligent function module switch setting .................. Refer to Section 4.5, Section 4.6 (2), (c)
(After intelligent function module switch setting, reset the programmable controller CPU or switch
power OFF,
then ON.)
(1) Perform the offset/gain settings in the range that satisfies the conditions
specified in Section 3.1.2, (1) and (2).
When the setting exceeds this range, the maximum resolution or total
accuracy may not be within the range indicated in the performance
specification.
(2) Perform the offset/gain settings separately for each channel. If channels are
set in Un\G22 and Un\G23 at the same time, an error will occur and the ERR.
LED will be lit.
(3) After the offset and gain settings are completed, verify that the offset and gain
values have been set correctly under actual usage conditions.
(4) The offset and gain values are stored into the Flash memory and are not
erased at power-off.
(5) At the time of offset/gain setting, turn ON the user range write request (YA) to
write the values to the Flash memory.
Data can be written to the Flash memory up to 100 thousand times.
To prevent accidental write to the Flash memory, an error will occur and the
error code (Un\G19) will be stored if write is performed 26 consecutive times.
(6) If an error (error code: 40
correct offset/gain value.
The offset/gain value of the channel where the error has occurred is not
written to the Q66DA-G. (*1: indicates the corresponding channel number.)
(7) Module Ready (X0) turns from OFF to ON when the offset/gain setting mode
switches to the normal mode by the dedicated instruction (G(P).OFFGAN) or
the setting of the mode switching setting (Un\G158, Un\G159).
Note that initial setting processing will be executed if there is a sequence
program that makes initial setting when Module Ready (X0) turns ON.
(8) D/A conversion is discontinued if the mode is switched (from the normal mode
to the offset/gain setting mode or from the offset/gain setting mode to the
normal mode) by the dedicated instruction (G(P).OFFGAN) or the setting of
the mode switching setting (Un\G158, Un\G159).
(9) Un\G200, Un\G202 to Un\G217 are the areas used to restore the user range
settings offset/gain values when online module change is made.
Refer to Chapter 7 for details of online module change.
*1
) occurs during offset/gain setting, re-set the