4
SETUP AND PROCEDURES BEFORE OPERATION
4.6 Offset/Gain Settings
4.6.2 Offset/gain settings (Q66AD-DG)
4 - 21
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
SETUP AND
PROCEDURES
BEFORE OPERATION
5
UTILITY PACKAGE
(GX CONFIGURATOR-
AD)
6
PROGRAMMING
7
ONLINE MODULE
CHANGE
8
TROUBLESHOOTING
(1) Perform the offset/gain settings in the range that satisfies the conditions
specified in POINT of Section 3.1.2 (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) Though the offset/gain settings can be performed on multiple channels at the
same time, set the offset and gain separately (0 at either of the buffer
memory addresses 22, 23).
If channels are set at Un\G22 and Un\G23 at the same time, an error will
occur and the ERR. LED will be lit.
(3) After the offset/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
*
1
) occurs during offset/gain setting, re-set the
correct offset/gain value.
The offset/gain value of the channel where the error has occurred is not
written to the A/D converter module. (
*
1
:
indicates the corresponding
channel number.)
(7) When the offset/gain setting mode is switched to the normal mode, the
module ready (X0) turns from OFF to ON.
Note that the initial setting processing will be executed at this time if there is a
sequence program that performs initial settings when the module ready (X0)
turns ON.
(8) When one mode is switched to the other (the normal mode is switched to the
offset/gain setting mode or the offset/gain setting mode is switched to the nor-
mal mode), A/D conversion is suspended and the power supply to the 2-wire
transmitter is turned OFF.
To resume A/D conversion and supply power to the 2-wire transmitter, turn
ON the operating condition setting request (Y9) after the mode is switched to
the normal mode.
(9) Un\G202 to Un\G225 are the areas used to restore the User-set offset/gain
values when online module change is made.
Refer to Chapter 7 for details of online module change.
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