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Mitsubishi Electric MELSEC-Q series User Manual page 154

Programmable controller current transformer input module
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● Configure the offset/gain setting in accordance with the actual use situation.
● Offset and gain values are recorded in the non-volatile memory in the CT input module by turning on then off User range
write request (YA). The values are not deleted even after the power is turned off. If the values are written 26 times in
succession, an error (error code: 162) occurs and the error code is stored in Latest error code (Un\G19) to prevent an
improper write to non-volatile memory.
● Configure the offset/gain setting in the range satisfying the condition described in the following section. If a setting is out
of the specified range, the maximum resolution and accuracy of the module may not fall within the range described in the
performance specifications list.
• I/O conversion characteristics (
● The offset/gain setting can be configured for multiple channels at the same time; however, the offset setting and gain
setting must be configured separately. If the settings are configured at the same time, an error (error code: 500) occurs
and the ERR. LED turns on.
● When User range write request (YA) is turned on, the integrity of the offset and gain values are checked. If an error (error
code: 40) occurs in even one channel, the offset and gain values are not written to the module. Check the value in
Latest error code (Un\G19), and take the action described in the following section to start over the offset/gain setting.
• Error Code List (
● When the mode is switched from the offset/gain setting mode to the normal mode by the setting of the dedicated
instruction (G(P).OFFGAN) or Mode switching setting (Un\G158, Un\G159), Module READY (X0) turns on. Note that
initial settings are processed at this timing if any sequence program is set to configure initial settings when Module
READY (X0) turns on.
● To activate the intelligent function module switch setting after writing the setting to the CPU module, reset the CPU
module or turn off then on the power supply.
● If a user range is not set in CH Input range setting (Un\G150 to Un\G157), an error (error code: 511) occurs.
● When the mode is switched from the offset/gain setting mode to the normal mode, the stored value of the buffer memory
is restored to the status before the switching. The CT input module operates with the restored buffer memory values.
● If a gain setting is configured for input whose digital value exceeds 10000, the accuracy of digital values cannot be
guaranteed. Configure an offset/gain setting so that the digital values are within 0 t0 10000.
● When the mode is switched using the dedicated instruction (G(P).OFFGAN) or Mode switching setting (Un\G158,
Un\G159), the digital conversion stops. To resume the digital conversion, turn on then off Operating condition setting
request (Y9) after switching the mode to the normal mode.
(2) Program example
(a) Device
The I/O numbers of the CT input module are X/Y00 to 0F.
Ex.
The following table lists the devices used in the program example.
M0
M1
M2
M3
M4
M5
M10
D0
D1
152
Page 221, Section 11.1)
Device
Channel selection
Offset setting
Gain setting
Channel change command
Command to write offset/gain setting values to the module
Mode switching
Input range change command
Channel-specified storage device
Storage device for the setting value of the dedicated instruction (G(P).OFFGAN)
Page 27, Section 3.2.2)
Function
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