Mitsubishi q64rd, 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.OFFGAN) Refer to Section 4.6 (2), (a)
•
Setting made to mode switching setting (buffer memory addresses 158, 159:
Un\G158, Un\G159) and turning the 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
•
Check the offset and gain values in the actual operating status.
•
By turning ON the user range write request (YA), the offset and gain values are
stored into the E
2
PROM and will not be erased at power-off.
•
Make offset/gain setting within the measured temperature range.
If setting is made outside the measured temperature range, the resolution and
accuracy may not fall within the ranges of the performance specifications.
•
Offset/gain setting may be made for two or more channels simultaneously.
•
Do not set the offset and gain values simultaneously.
Specifying them at the same time will cause an error, lighting up the
ERROR/ERR. LED.
•
If an error occurs during offset/gain setting, setting can be continued on another
channel or the like.
However, since the error remains occurring, turn on the Error Clear Request (YF)
when you want to clear the error.
•
At the time of offset/gain setting, turn ON the user range write 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 the error code
(buffer memory address 19: Un\G19) will be stored if write is performed 26
consecutive times.
•
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 Q64RD. ( 1: indicates the corresponding channel number.)
•
Module Ready (X0) turns from OFF to ON when the offset/gain setting mode
switches to the normal mode by the dedicated instruction (G.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.
Also, the error is cleared when the mode is switched.
•
The areas of Factory default offset/gain value/User range settings offset/gain
value/User range settings offset/gain resistance value (buffer memory address
160 to 255: Un\G160 to 255) are related with the user range save/restore function
and allows users to re-set the offset/gain values easily in the case of online
module change.
These area are not used for the offset/gain setting.