Input Signal Error Detection Function - Mitsubishi Electric MELSEC-Q series User Manual

4.6

Input Signal Error Detection Function

Overrange of a CT input value (excess of a peak value) can be detected. Since a CT input module can detect that a
high current out of range flew through a measured target, an error on the measured target is monitored easily.
Alternating
current waveform
Peak value
Measurement range
of an input range
Peak value
CH1 Input signal error detection flag
(Un\G49.b0)
Input signal error detection signal (XC)
CH1 Conversion completed
flag (Un\G10.b0)
CH1 Digital output value (Un\G11)
Error clear request (YF)
Latest error code (Un\G19)
(1) Detection level of Input signal errors
The level of current that is detected as an input signal error depends on the input range setting. The current level
is about 125% of the gain value for the input range.
Factory default range 0 to 5AAC
User range 0 to 5AAC
Factory default range 0 to 50AAC
User range 0 to 50AAC
Factory default range 0 to 100AAC
User range 0 to 100AAC
Factory default range 0 to 200AAC
User range 0 to 200AAC
Factory default range 0 to 400AAC
User range 0 to 400AAC
Factory default range 0 to 600AAC
User range 0 to 600AAC
42
0
OFF
OFF
ON
Value before the
overrange occurrence
OFF
Input range setting
Controlled by the CT input module
Controlled by the sequence program
Overrange
Returns to
occurrence
the measurement
range
Sampling cycle
ON
ON
OFF
0 Error occurrence
Approximately 6.25AAC
Approximately 62.5AAC
Approximately 125AAC
Approximately 250AAC
Approximately 500AAC
Approximately 750AAC
Current value from the CT
Time
OFF
OFF
ON
Value returned to
the measurement range
ON
OFF
0
Detection level