Quadrature Bi-Pulse Counter - Toshiba PROSEC T1-16S User Manual

8.3.3

Quadrature bi-pulse counter

Function
This function counts up or down the quadrature bi-pulse (2-phase pulses whose
phases are shifted 90 each other). Counts up when phase A precedes, and counts
down when phase B precedes. Both rising and falling edges of each phase are
counted. Consequently, 4 times count value against the pulse frequency is obtained.
Phase A
Phase B
When the count value reaches the comparison value 1 (or 2), the I/O interrupt
program #1 (or #2) is activated (if the interrupt enable flag for each is ON).
This counter operation is enabled while the soft-gate is ON. The count value is reset to
0 when the soft-gate is changed from ON to OFF. The count value is also reset to 0
when the reset input comes ON.
When the soft-gate is OFF, the count value can be changed by writing the data into
the comparison value 1 (or 2) register and setting the count preset flag 1 (or 2) to ON.
The comparison value 1 and 2 can be changed even when the soft-gate is ON.
The count value range is -2147483648 to 2147483647 (32-bit data).
Hardware condition
Phase A and phase B (X000 and X001)
ON/OFF pulse width: 100 s or more (max. 5KHz)
Reset input (X002)
ON/OFF duration:
Related registers
SW16: Function selection. Refer to section 8.1.
Function
Phase A
Phase B
Reset input
Comparison value 1
Comparison value 2
Count value
Soft-gate
Interrupt enable 1
Count preset 1
Interrupt enable 2
Count preset 2
Up count
2ms or more
Register/device
X000
X001
X002
SW19 SW18
SW21 SW20
SW23 SW22
S240
S241
S243
S249
S24B
8. Special I/O Functions
Down count
Remarks
Data range: -2147483648 to 2147483647
Operation is enabled when ON
Interrupt 1 is enabled when ON
Used to preset the count value
Interrupt 2 is enabled when ON
Used to preset the count value
Basic Hardware and Function
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