Rockwell Automation 1771-ASB/E Remote I/O Adapter User Manual - Manual (Page 58)

4–2 Troubleshooting
Publication 1771-UM001A-US-P - February 2000
Table 4.A
Remote I/O System Troubleshooting Guide
Indicators
Active Adapter I/O
FaultRack
Description Probable Cause Recommended Action
On Off Off Normal indication; remote adapter is
fully operational; processor is in Run
mode
Off On Off Adapter crash. RAM memory fault.
Watchdog timeout
Cycle power. Replace module if
problem reoccurs.
On Blink Off Module placement error I/O module in incorrect slot. Place module in correct slot in chassis.
Blink in unison Off Incorrect starting I/O group number Error in starting I/O group number or I/O
rack address
Check dipswitch settings. Refer to table
3.B to verify acceptable beginning I/O
group number; set switches correctly
On On On Module not communicating Incorrect baud rate setting Check dipswitch setting
Off On On Module not communicating Scan switch set for "all but last 4 slots" in
1/4 rack
Reset scan switch setting
Blink Off Off Remote adapter not actively
controlling I/O (scanner to adapter
communication link is normal) 4 ;
scanner manual or
autoconfiguration 8 was successful
Processor is in program or test mode
Scanner is holding adapter module in
fault mode;
Configuration mismatch
Place processor in Run mode.
Fault should be cleared by I/O scanner
Correct the configuration mismatch, i.e.
incorrect rack size, rack number
LEDs sequence on/off
from top to bottom
Module not communicating Another remote I/O adapter with the
same address is on the link.
Correct the address.
Blink
alternately
Off Adapter module not actively
controlling I/O 2
Adapter module in processor restart
lockout mode (adapter to scanner
link is normal) 5
Processor restart lockout switch on
chassis backplane switch assembly on 1
Depress reset button to clear lockout
feature or cycle power; if after repeated
attempts indicators are still blinking,
check:
• pushbutton not wired properly to
field wiring arm
• wiring arm not connected to
adapter module
• adapter module was reset by
processor/scanner, then
immediately faulted
Off Off On I/O chassis fault. 2 No communication
on link.
Problem exists between:
• adapter and module in chassis; the
module will stay in fault mode until
fault is corrected
• shorted printed circuit board runs on
backplane or I/O module
Cycle power to the chassis to clear a
problem resulting from high noise 3
• remove and replace all I/O
modules one at a time
• if problem does not clear,
something is wrong in chassis or I/O
module
Blink Off On Communication on link. Chassis
violation.
Possible shorted backplane in chassis.
Excessive noise on backplane. 6
Identify source of noise. Suppress
output module inductive loads or noise
sources in proximity to output module
wiring. Target the problem by splitting
the rack into smaller racks.
Check chassis, Replace chassis as
necessary.