5: S
PECIAL
F
UNCTIONS
5-24 S
MART
AXIS P
RO
/L
ITE
U
SER
'
S
M
ANUAL
FT9Y-B1378
• Overflow
When the current value exceeds 4,294,967,295, the special internal relay turns on for only one scan. When the current value
overflows, it becomes 0.
• Underflow
When the current value falls below 0, the special internal relay turns on for only one scan. When the current value underflows, it
becomes 4,294,967,295.
• Comparison output reset
When the special internal relay turns on, the comparison output selected on High-speed Counter Settings turns off.
• Reset input
When reset input is turned on, the current value returns to the reset value.
• Preset value, reset value storage locations
The preset value and the reset value for the high-speed counter are stored in special data registers as 2 words.
When the 32-bit data storage setting in the function area settings is set to From Lower Word, the lower word is stored in the
first device.
Group
1
(I0 to I1)
2
(I2)
3
(I3 to I4)
4
(I5)
5
(I6)
6
(I7)
Read/Write
Overflow M8035 M8044 M8052 M8061 M8172 M8177 R
Group
1
(I0 to I1)
2
(I2)
3
(I3 to I4)
4
(I5)
5
(I6)
6
(I7)
Read/Write
Underflow M8036 — M8053 — — — R
Group
1
(I0 to I1)
2
(I2)
3
(I3 to I4)
4
(I5)
5
(I6)
6
(I7)
Read/Write
Comparison Output Reset M8030 M8040 M8045 M8055 M8166 M8173 R/W
Group
1
(I0 to I1)
2
(I2)
3
(I3 to I4)
4
(I5)
5
(I6)
6
(I7)
Read/Write
Reset Input M8032 M8042 M8047 M8057 M8170 M8175 R/W
Group
1
(I0 to I1)
2
(I2)
3
(I3 to I4)
4
(I5)
5
(I6)
6
(I7)
Read/Write
Preset Value (Upper word) D8052 D8058 D8064 D8070 D8136 D8142
R/W
Preset Value (Lower word) D8053 D8059 D8065 D8071 D8137 D8143
Reset Value (Upper word) D8054 D8060 D8066 D8072 D8138 D8144
Reset Value (Lower word) D8055 D8061 D8067 D8073 D8139 D8145
Reset input
NN-1 N+1
Reset value (initial value)Current value
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