Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
34 I/O Configuration
Rising Edge Behavior - Example 1
Rising Edge Behavior - Example 2
The previous examples demonstrate rising edge behavior. Falling edge
behavior operates exactly the same way with these exceptions:
TIP
The “gray” area of the Latched Status waveform is the input filter delay.
IMPORTANT
The input file value does not represent the external input when the input is
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).
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
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

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes