Ch Rate Alarm Warning Detection Period (Buffer Memory Addresses 118 To 121: Un\G118 To Un\G121) - Mitsubishi MELSEC Q Series User Manual

3 SPECIFICATIONS
3.4.18 CH rate alarm warning detection period (buffer memory addresses 118 to 121:
Un\G118 to Un\G121)
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(1) Set the period, at which the varying rate of the digital output value will be
checked, on a channel basis.
(2) To make the setting valid, the operating condition setting request (Y9) must be
turned ON/OFF. (Refer to Section 3.3.2.)
(3) The setting range is 10 to 5000ms.
The value can be set in 1ms increments, but the first digit is discarded and the
value is processed in 10ms increments.
(4) When time averaging or count averaging has been specified for averaging
process specification, set the rate alarm warning detection period as a multiple of
the time averaging or count averaging conversion period.
Example) When the count setting of count averaging is 20 times, the conversion
period is 200ms. Therefore, set a multiple of 200, e.g. 400 or 600.
20 (times)
(5) The default setting is 0ms.
(6) Refer to Section 3.2.4 for details of the rate alarm.
POINT
(1) The channel where the value outside the above setting range has been
written results in an error, the error code is stored into the Error code (buffer
memory address 19: Un\G19), the error flag (XF) turns ON, and the time
averaging or count averaging processing and rate alarm are executed at the
pre-error setting.
(2) Since the default setting is 0, change the setting.
(3) If the upper limit value and lower limit value settings of the rate alarm are
small, the warning output may turn ON due to overreaction to disturbance or
like. In this case, overreaction to disturbance or like can be avoided by
increasing the setting of the rate alarm warning detection period.
10 (ms) = 200 (ms)
MELSEC-Q
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