Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
I/O Configuration 35
• The detection is on the “falling edge” of the external input.
• The input image is normally “on” (1), and changes to “off” (0) for
one scan.
Falling Edge Behavior - Example 1
Falling Edge Behavior - Example 2
TIP
The “gray” area of the Latched Status waveform is the input filter delay.
Scan Number (X) Scan Number (X+1) Scan Number (X+2)
External
Input
Latched
Status
Input File
Value
Input
Scan
Ladder
Scan
Output
Scan
Scan Number (X+3)
Input
Scan
Ladder
Scan
Output
Scan
Input
Scan
Ladder
Scan
Output
Scan
Input
Scan
Ladder
Scan
Output
Scan
Scan Number (X) Scan Number (X+1) Scan Number (X+2)
External
Input
Latched
Status
Input File
Value
Input
Scan
Ladder
Scan
Output
Scan
Input
Scan
Ladder
Scan
Output
Scan
Input
Scan
Ladder
Scan
Output
Scan
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Allen-Bradley MicroLogix 1400 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1400
Category	Controller
Language	English