Mitsubishi Electric GX Configurator-DA, User Manual

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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 (2), (a)
• Setting made to mode switching setting (buffer memory address 158, 159: Un\G158,
Un\G159) and turning Operating 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.)
POINT
(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 Offset/gain setting mode Offset specification (buffer memory address 22:
Un\G22) and Offset/gain setting mode Gain specification (buffer memory
address 23: UN\G23), at the same time, an error will occur and the ERROR
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 E
2
PROM and are not erased at
power-off.
(5) At the time of offset/gain setting, turn on User range writing request (YA) to
write the values to the E
2
PROM.
Data can be written to the E
2
PROM up to 100 thousand times.
To prevent accidental write to the E
2
PROM, an error will occur and Error code
(buffer memory address 19: 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 D/A converter 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 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) 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
Mode switching setting (buffer memory addresses 158, 159: Un\G158,
Un\G159).
(9) Pass data classification setting (buffer memory address 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.