User manual

Adapter Fault
Local Fault
AllenBradley
24 VDC
POWER SUPPLY
RIO ADAPTER
1794-ASB
ADAPTER
ACTIVE FAULT
LOCAL
FAULT
Adapter Active
4–2 Troubleshooting
Publication 17946.5.3 - May 1996
Table 4.A
Remote I/O System Troubleshooting Guide
Communication States and Module Display
Local
Fault
Adapter
Fault
Adapter
Active
Operating State Actions Fault Reset
Off Off On Normal Communications
Outputs enabled.
Communicating with scanner
Not applicable
Off Off Blinking Program/Test mode
Outputs disabled
Communicating with scanner
Sending current input status
back to scanner.
Not applicable
Off Off Off
Communication (lack of
communications)
Outputs follow last state switch
setting
Resume proper communications (if no
processor restart lockout)
Off Blinking alternately
Processor lockout in effect
during communications by
scanner
Outputs follow last state switch
setting.
No replies sent to scanner
Press Reset button on front of adapter
module (or cycle power) and resume
proper communication.
Module Faults
Local
Fault
Adapter
Fault
Adapter
Active
Fault Condition Actions Fault Reset
On On Off Noise problems on I/O bus All outputs off. Communications off.
Cycle power. (This fault is a fatal
fault.)
On Off
Following
Link
Status
Different module installed
replacing removed module.
Old inputs maintained. Outputs set
to zero.
Autoreset when incorrect module
is removed; or cycle power to
establish new identification for
module.
Blinking Off
Following
Link
Status
Module not responding.
Possibly module removed
under power.
Old inputs maintained. Outputs set
to zero.
Replace same module; or cycle
power to establish new
identification for module.
Configuration Faults
Local
Fault
Adapter
Fault
Adapter
Active
Fault Condition Actions Fault Reset
Off Blinking in unison Incorrect starting I/O group number.
On On On Incorrect baud rate setting.
Not a
pp
licable.
Turn power off. Set SW1 and
SW2 tl T
Blinking in sequence
Another adapter on the link has the
same address.
Not
applicable
.
p
SW2 correctly. Turn power on.