IDEC SmartAXIS FT9Z-1A01 User Manual page 117

HSC reset input and reset status

When the HSC reset input is enabled in group 1 or group 3, turn on HSC reset input I2 or I5 to return the current value to the reset
value.
In this situation, reset status turns on for only one scan.
HSC reset input
Reset status
Current value N-1
Group
HSC Reset Input
Reset Status
To use the reset input with the group 1 or group 3 single-phase high-speed counter, use I2 (group 2) or I5 (group 4). When not
using I2 or I5 as a reset input, they can be used as normal input, high-speed counters, catch input, interrupt input, or frequency
measurements.
Count direction flag

These special internal relays maintain whether the group 1 or group 3 current value count is the adding direction or the subtracting
direction. When these special internal relays are on, they indicate the adding direction. When they are off, they indicate the
subtracting direction.
The flag operates as follows for each counting mode setting.
Counting mode
Adding counter
Single-phase
Up/down
high-speed
selection
counter
reversible
counter
Two-phase
2-edge count /
high-speed
4-edge count
counter
*1 When operating as a two-phase high-speed counter, the count direction flag does not reflect the current adding/subtracting direction and
indicates the adding/subtracting direction for the previous comparison.
Group
Count Direction flag
N N+1
1 2
(I0 to I1) (I2)
I2 —
M8033 —
Count direction flag status
Always the adding direction

Adding direction when the up/down selection

input is on.
Subtracting direction when the up/down

selection input is off.
Adding direction if the current value is

incremented and reached to the preset value
or the current value overflows in the previous
comparison operation.
Subtracting direction if the current value is

decremented and reached to the preset value
or the current value underflows in the previous
*1
comparison operation.
The default is the adding direction.

1 2
(I0 to I1) (I2)
M8037 —
S A XI S P / L U
M AR T R O I TE
One scan
Reset value (initial value)
3 4
(I3 to I4) (I5)
I5 —
M8050 —
When the count direction flag changes
None

When the up/down selection input status has

changed.
When the current value and the preset value

are equal.
When a current value overflow or underflow

has occurred.
3 4
(I3 to I4) (I5)
M8054 —
' M FT9Y-B 1378
SER S ANUAL
5: S F
P ECI AL UN CTI ON S
5 6
Read/Write
(I6) (I7)
— —
— —
5 6
Read/Write
(I6) (I7)
— —
—
R
R
5-25