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MELSEC-Q
3 SPECIFICATIONS
3.2.2 Maximum and minimum values hold function
(1) The maximum and minimum digital output values for each channel are stored in buffer
memory addresses 30 to 45 (Un\G30 to Un\G45).
(2) When the operating condition setting completed flag (X09) turns OFF, the values
are cleared to 0 and new maximum and minimum values are stored when
conversion begins.
(3) Since the area for storing the maximum and minimum values can be rewritten with
the sequence program, the maximum and minimum values within a specific period
of time can be checked.
3.3 I/O Signals for the PLC CPU
3.3.1 List of I/O signals
Table 3.3 shows a list of the I/O signals for the A/D converter modules.
Note that I/O numbers (X/Y) shown in this chapter and thereafter are the values when
the start I/O number for the A/D converter module is set to 0.
Table 3.3 List of I/O signal
Signal direction CPU A/D converter module Signal direction CPU A/D converter module
Device No. (Input) Signal name Device No. (Output) Signal name
X0 Module READY Y0
X1 Temperature drift compensation flag Y1
X2 Y2
X3 Y3
X4 Y4
X5 Y5
X6 Y6
X7 Y7
X8
Use prohibited
1
Y8
Use prohibited
1
X9 High resolution mode status flag Y9 Operating condition setting request
XA Offset/gain setting mode flag YA User range write request
XB Channel change completed flag YB Channel change request
XC
Use prohibited
1
YC
Use prohibited
1
XD
Maximum value/minimum value reset
completed flag
YD
Maximum value/minimum value reset
request
XE A/D conversion completed flag YE
Use prohibited
1
XF Error flag YF Error clear request
POINT
1 These signals cannot be used by the user since they are for system use only.
If these are turned ON/OFF by the sequence program, the functioning of the
A/D converter module cannot be guaranteed.