Allen-Bradley MicroLogix 1400 User Manual

Publication 1766-RM001A-EN-P - October 2008
Knowledgebase Quick Starts 637
TROUBLESHOOTING
Problem #1:The input display on the MicroLogix LCD screen turn on and
off, but no counts are seen in the HSC accumulator.
Solution:The input filter frequency may need to be adjusted in order to
capture the input pulses.
Follow the steps below.
1. Select “I/O Configuration”
2. Highlight the “MicroLogix 1400“
3. Select “Adv Config“
4. Select the “Embedded I/O Configuration” Tab
5. Adjust Input filters as needed
Problem #2: The HSC instruction does not accumulate counts and the
Error Code (ER) shows a value of (1).
Solution:A file number was entered into (PFN) but the value entered was
less then (3) or greater then (255) or the file number entered was correct,
however the file does not exist.
Create the NEW program file by “Right” mouse clicking on “Program
Files”
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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