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MELSEC-Q
4 SETUP AND PROCEDURES BEFORE OPERATION
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 4.6.1 (2), (a)
• Setting made to mode switching setting (buffer memory addresses 158, 159:
Un\G158, Un\G159) and turning the operation condition setting request (Y9) from
OFF to ON .................................................. Refer to Section 4.6.1 (2), (b)
• Intelligent function module switch setting .. Refer to Section 4.5, Section 4.6.1 (2), (c)
(After intelligent function module switch setting, reset the programmable controller
CPU or switch power OFF, then ON.)
2 Avoid the following operations during the steps indicated with 2. Doing so may cause
an error in the data inside the E
2
PROM, resulting in the Q64AD-GH failing to operate
normally.
• Powering Off the programmable controller CPU
• Resetting the programmable controller CPU
POINT
(1) Perform the offset/gain settings in the range that satisfies the conditions
specified in POINT of Section 3.1.2 (1).
When the setting exceeds this range, the resolution or 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 the buffer memory addresses 22 (Un\G22) and 23
(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 E
2
PROM and are not erased at
power-off.
(5) In configuring the offset/gain setting, turning ON the user range write request
(YA) enables the data to be written to the E
2
PROM.
Data can be written to the E
2
PROM up to 100 thousand times.
Writing data 26 times in a row causes an error (error code: 162), which is
intended to protect the E
2
PROM from inadvertent write.
(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 module.(
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 (buffer memory addresses 158, 159:
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) Buffer memory addresses 200 (Un\G200), 202 to 233 (Un\G202 to Un\G233)
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.
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