12 High-speed Comparison and High-speed Capture
12.3 High-speed Capture
A deviation often occurs when the present position of an axis or the value in C200/C204 is read. To
prevent a deviation from occurring, users read a value immediately by setting an input terminal to ON.
Capture is described below.
(C) Data register n (n=0~7)
(B) Control register n (n=0~7)
(D) Capture source
(G)FROM K253 K1 D0 D50
(A)TO K253 K1 D0 D50
(F) Trigger
(E) Capture mode
Block (A): The instruction TO is used to write data into control registers (block B).
Block (B): Users set a capture source (block D), set bit 5~bit 4 to 0 (block E), and set a trigger (block F)
in a control register.
Block (C): The capture of a value (block D) is triggered by an input terminal, and the value captured is
stored in data registers.
Block (D): The present positions of three axes, the values in C200 and C204 are capture sources.
Block (E): Capture mode
Block (F): External trigger
Block (G): The instruction FROM is used to read data from control registers (block C) and data registers
(block B). The values stored in the data registers are values captured.
Procedure for a high-speed capture: The instruction TO is used to write data into control registers
(block A).An input terminal is set to ON (block F).The present position of the X-axis/Y-axis/Z-axis,
or the value in C200/C204 is captured (block D). The value captured is stored in data registers (block
C).Users read the value captured by means of the instruction FROM.
Example
【
Description】
Start the high-speed counter C204. The value in C204 is captured when X5 is set to ON. A manual
pulse generator is used, and is connected to A1± and B1±.
【Steps】
1. When M1002 in O100 is ON, the initial setting of high-speed capture is carried out.
(1) D0=0Initial group number n=0
(2) D1=0
(3) D20=6Writing 6 values by means of the instruction TO (Only one value is captured.)
(4) D60=10Reading 6 values by means of the instruction FROM (Only one value is captured.)
2. When M1 is ON, the high-speed capture is set.
(1) The value in (D3, D2) is H5005.The capture source set is C204. (The value of bit 3~bit 0 is
5). The mode selected is a capture mode. (The value of bit 5~bit 4 is 0.) The trigger selected
is X5. (The value of bit 15~bit 12 is 5.)
(2) The value in (D5, D4) is K100. Users can set (D5, D4) by themselves.
3. The high-speed capture is started when M2 is ON.
DVP-20PM Application Manual
12-6
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