Mitsubishi Electric MELSEC-L02SCPU User Manual page 43

(d) Operation when detecting a pulse that has on width of two scans or more
The input device turns on for one scan.
External input signal
X0
Input device
X0
(3) Detectable pulse width
Pulse width that meets the following condition can be detected.
ON or OFF width of the pulse input > Input response time
When the condition is not met, the pulse cannot be detected correctly. Set the input response time values to meet
the condition.
(4) Precautions
Avoid the following actions for the input device (X0 to XF) that is set to the pulse catch function.
Otherwise, the input device does not turn on correctly for one scan after detecting a pulse.
• Use of the direct device (DX)
• Execution of the instruction that performs input refresh at execution, such as RFS, COM, CCOM(P), and
MTR
(5) Performance specifications
The following is the performance specifications of the pulse catch function.
Points
Input voltage/current
Standard input
Minimum input response time
Input response time setting
Points
Input voltage/current
High-speed input
Minimum input response time
Input response time setting
The response time at turning on  off of input devices can take 0.2ms even if the input response time is set to "0.1ms".
*1
*2 The response time can take 0.02ms even if the input response time is set to "0.01ms".
0 step END
0 step
Program
1) Input signal ON
OFF
OFF
Item
DC input
Differential input
CHAPTER 6 PULSE CATCH FUNCTION
0 step
END
2) ON for 1 scan
24VDC, 4.1mA (TYP.)
Depending on the setting value of the input response
*1
0.1ms /1ms/5ms/10ms/20ms/70ms
24VDC, 6.0mA (TYP.)
EIA Standard RS-422-A Differential line driver level
(AM26LS31 (manufactured by Texas Instruments
Incorporated) or equivalent)
Depending on the setting value of the input response
*2
0.01ms /0.1ms/0.2ms/0.4ms/0.6ms/1ms
Description
10
time setting
6
time setting
41
6