Mitsubishi Electric Melsec Q Series User Manual page 30

4 Functions
4.2.3 Max./min. value hold function
It memorizes the max./min. value for each measured item, and retains it until the max./min. value
clear is performed.
(1) Max./min. value memory
1) It memorizes the max. and min. values for the following measured item.
- Current demand
- Voltage
- Electric power demand
- Power factor
2) It memorizes the date and time of occurrence (year/month/day/hour/minute/second/day of the
week) together with the max. and min. values.
3) The max. and min. values and the date of occurrence are stored in the nonvolatile memory,
so that these values can be retained even at a power source reset.
(2) How to clear the max. and min. values
1) You can use the I/O signal to clear the max. and min. values.
2) The max. and min. values immediately after the clear will be the present values and the date
of occurrence will be the present date and time.
3) The following describes how to clear the max. and min. values.
(a) Check that Max./min. values clear request (YnD) is OFF.
(b) Set Max./min. values clear request (YnD) to ON.
This module clears all the max./min. values and the date of occurrence, and changes
Max./min. values clear completion flag (XnD) to ON.
(c) Check that Max./min. values clear completion flag (XnD) is ON, and then set Max./min.
values clear request (YnD) to OFF.Max./min. values clear completion flag (XnD) will be
turned OFF.
Max./min. values clear request (YnD)
Max./min. values clear completion flag (XnD)
Figure 4.2.3-1 Procedure for clearing max./min. value
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