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MELSEC-Q
3 SPECIFICATIONS
Buffer memory address
Item Details
Initial
value
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
Counter reset
request
• Setting "1" in the counter reset request resets the "sampling
pulse number", "accumulating count value" or "input pulse value"
of the buffer memory.
• When a reset is made, the input pulses are invalid for a
maximum of 20ms.
• If count operation has been stopped due to the detection of an
overflow when the accumulating counter is used as the linear
counter, the count operation is resumed after completion of a
counter reset.
• If the setting value is other than 1, the setting is ignored.
[Setting value]
1: Reset request
(The value automatically turns to "0" after completion of a
counter reset.)
0 13 45 77 109 141 173 205 237
Carry over
detection flag
• If the "accumulating count value" of the buffer memory exceeds
99999999 when the accumulating counter is used as the ring
counter, the carry over detection flag turns ON.
• Unlike the overflow detection flag, count operation is continued.
• The carry over detection flag is reset by setting "1" in the "carry
over reset request" of the buffer memory.
• Unlike the overflow detection flag, an error does not occur if the
carry over flag turns ON.
[Detection value]
0: No carry over detection (OFF)
1: Carry over detection (ON)
0 14 46 78 110 142 174 206 238
Carry over reset
request
• Set the carry over reset request.
• If the setting value is other than 1, the setting is ignored.
[Setting value]
1: Reset request
(The value automatically turns to "0" after completion of a carry
over reset.)
0 15 47 79 111 143 175 207 239
Error code
• Stores the error code.
• The latest error code is always stored into the error code.
0 16 48 80 112 144 176 208 240
Alarm output
selection
• Set whether an alarm will be output or not for the "sampling pulse
number" of the buffer memory.
• If the setting value is other than 0 or 1, an alarm output setting
range outside error (error code: 500) occurs.
[Setting value]
0: Alarm output function invalid
1: Alarm output function valid
0 17 49 81 113 145 177 209 241
Alarm output flag
• When "alarm output function valid" has been set in the "alarm
output selection" of the buffer memory, the alarm output flag
turns ON if the sampling pulse number exceeds the upper/upper
limit value or lower/lower limit value.
Not used
b15 b0b4b8b12
0:OFF
1:ON
Not used
Meaning
Lower limit alarm
Upper limit alarm
(Normal)
(Range over)
Storage Item
0 18 50 82 114 146 178 210 242
*: Refer to Section 9.3 for details of the error codes.
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