Mitsubishi Electric MELSEC-Q series User Manual page 117

(18)CH Rate alarm warning detection period (Un\G118 to Un\G125)
Set the cycle for checking the change rate of digital output values for each channel.
For details on the warning output function (rate alarm), refer to the following.
• Warning Output Function (Rate Alarm) (
(a) Setting range
• Setting range: 10 to 5000ms
• Configure per 10ms unit. A value per 1ms unit is rounded off.
• In the channel where a setting value other than the above is set, an error occurs. The error code (70) is
stored in Latest error code (Un\G19) and Error flag (XF) turns on. The time average, count average, and
rate alarm operate in the setting before the error occurs.
• Set an integral multiple of the conversion cycle on each digital conversion method. If these areas are not
set as the integral multiple, an alert is output at the maximum cycle satisfying the rate alarm warning
detection period or less and the integral multiple of the conversion cycle.
Rate alarm warning detection period for the following condition
Ex.
• Digital conversion method: Count average
• Count average: 10 times
• Sampling cycle: 100ms/8CH
The conversion cycle is 1000ms (10 (times) × 100 (ms)). Therefore, set an integral multiple of 1000ms, such as
1000ms or 2000ms for the rate alarm warning detection period.
Remark
When a small value is set for the rate alarm upper limit value or the rate alarm lower limit value, even a slight disturbance
may cause the alert output to turn on. To prevent this, set a long rate alarm warning detection period.
(b) Enabling the setting
Turn on then off Operating condition setting request (Y9) to enable the setting.
(c) Default value
All channels are set to 0.
Since 0 is set as the default value, change the set value to use the rate alarm.
Page 53, Section 4.10 (2))
CHAPTER 6 BUFFER MEMORY
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