Function of each device
45
3-7. Some Points to Note
Action order of input/output relay and response delay》
《Not accept narrow input pulse signal》
Dual output(Dual coils)action》
《
《
Y3
Y4
Y3
X1
Y3
X2
PLC’s input ON/OFF time should be longer than its loop time. If consider input filter’s
response delay 10ms, loop time is 10ms，then ON/OFF time needs 20 ms separately. So, up to
1，000/（20+20）=25Hz input pulse can’t be disposed. But, this condition could be improved
when use PLC’s special function and applied instructions.
As shown in the left map, please consider
the things of using the same coil Y003 at
many positions:
E.g. X001=ON，X002=OFF
At first, X001 is ON, its image area is ON,
output Y004 is also ON.
But, as input X002 is OFF, the image area
of Y003 is OFF.
So, the actual output is : Y003=OFF,
Y004= ON.
Input disposal
Before PLC executing the program, read all the input terminal’s ON/OFF status of PLC to
the image area. In the process of executing the program, even the input changed, the content
e. However, in the input disposal of next scan cycle,
read out the change.
Output disposal
Once finish executing all the instructions, transfer the ON/OFF status of output Y image
area to the output lock memory area. This will be the actual output of the PLC. The
contacts used for the PLC’s exterior output will act according to the device’s response
delay time.
ormat in a batch, the drive time and operation cycle of input
filter and output device will also appear response delay.
in the input image area will not chang
When use this input/output f
When executing dual output (use dual coil),
the back side act in prior
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