Analog Outputs - Allen-Bradley MicroLogix 1400 Instruction Manual

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34 I/O Configuration
Publication 1766-RM001A-EN-P - October 2008
Rising Edge Behavior - Example 1
Scan Number (X)
Input
Scan
External
Input
Latched
Status
Input File
Value
Rising Edge Behavior - Example 2
Scan Number (X)
Input
Scan
External
Input
Latched
Status
Input File
Value
The "gray" area of the Latched Status waveform is the input filter delay.
TIP
The input file value does not represent the external input when the input is
IMPORTANT
configured for latching behavior. When configured for rising edge behavior,
the input file value is normally "off" ("on" for 1 scan when a rising edge
pulse is detected).
The previous examples demonstrate rising edge behavior. Falling edge
behavior operates exactly the same way with these exceptions:
Scan Number (X+1)
Ladder Output Input Ladder Output
Scan Scan Scan Scan Scan
Scan Number (X+1)
Ladder Output Input Ladder Output
Scan Scan Scan Scan Scan
Scan Number (X+2)
Input Ladder Output
Scan Scan Scan
Scan Number (X+2)
Input Ladder Output
Scan Scan Scan