Measuring And Saving The Reference Value In The Flash Rom - Mitsubishi Electric MELSEC Q Series User Manual

11.9.1

Measuring and saving the reference value in the flash ROM

Before using the accumulated pulse error detection function, the reference value needs to be measured to detect
errors.
Reference value means the maximum/minimum accumulated pulse values that are output when the QD73A1 is
operating normally.
The QD73A1 obtains the judgment value for alert output and immediate stop and carry out control using the reference
value, alert output accumulated pulse setting value, and immediate stop accumulated pulse setting value.
Executing procedure is as follows.
1.
Set "
Cd.19
measurement.
The QD73A1 monitors the status of accumulated pulses and measures the maximum/minimum values
while "
Cd.19
2.
Set "
Cd.20
measurement flag" is set to "1: Measured".
The QD73A1 saves the measured maximum/minimum values in the flash ROM when "
value write request" is set to 1.
Positioning command
Accumulated pulse
Start signal (Y20 to Y26)
BUSY signal (X14)
Cd.19 Measurement start
request
Md.20 Reference value
measurement flag
Cd.20 Reference value
write request
Measurement start request" to "1: Requested" and start the reference value
Measurement start request" is set to 1.
Reference value write request" to "1: Requested" when "
v
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
CHAPTER 11 CONTROL SUB FUNCTIONS
Measurement range
Minimum value
Cleared to 0 by the QD73A1
Reference value
Md.20
Reference
Cd.20
t
Maximum
value
ON
Executed by the QD73A1
225
11