GE IS221YDOAS1B I/O Pack YDOA
CPU Indicators
On Blinking Off
CPE305 LED CPE310 LED LED State CPU Operating State
OK CPU OK On Green CPU has passed its power-up diagnostics and is
functioning properly. (After initialization sequence is
complete.)
Off CPU problem. RUN and OUTPUTS ENABLED LEDs
may be blinking in an error code pattern, which can
be used by technical support for troubleshooting.
This condition and any error codes should be
reported to your technical support representative.
Blinking
Other LEDs off
CPU in STOP-Halt state; possible watchdog timer
fault. Refer to the fault tables. If PME cannot
connect, cycle power with a charged Energy Pack
attached and refer to fault tables.
OK CPU OK Blinking in
unison
CPU is in boot mode and is waiting for a firmware
update through a serial port.
EN OUTPUTS
ENABLED
RN RUN On Green CPU is in RUN Mode.
Off CPU is in STOP Mode.
EN OUTPUTS
ENABLED
On Green Output scan is enabled.
Off Output scan is disabled.
I/O FORCE I/O FORCE On Yellow Override is active on a bit reference.
STATUS STATUS Blinking
Green
Energy Pack charging; not yet charged above the
minimum operating voltage.
On Red Energy Pack circuit fault.
Blinking Red Energy Pack near its end-of-life and should be
replaced soon.
On Green Energy Pack is charged above its minimum
operating voltage.
Off Energy Pack not connected.
SYS FLT
(System Fault)
SYS FLT On Red CPU is in Stop/Faulted mode because a fatal fault
has occurred.
CM COM1 Blinking
Green
Signals activity on serial port COM1.
Off No activity on serial port COM1.
N/A RDSD /
COM2
Blinking
Green
Signals activity on serial port COM2.

CPE305 LED CPE310 LED LED State CPU Operating State
Off No activity on serial port COM2.
(RDSD not attached)
RDSD Indicators CPE305 & CPE310 On Blinking Off
CPE305
LED CPE310 LED LED State RDSD Operating State
SYS FLT On Red The RDSD has been removed during a store. The
CPU must be power cycled to resume RDSD
operations. RDSD / COM2 Off or
Blinking
Green
RDSD40 RDSD40/COM2 On Green Valid RDSD connected or data transfer complete.
Blinking
Green
Data transfer in progress.
On Red RDSD fault. Check for and correct the following
conditions:
• CPU type mismatch with project on RDSD.
• Data transfer error.
• Corrupted or invalid USB file system.
• Insufficient space on RDSD.
Blinking
Red
RDSD-Controller project name mismatch.
Off RDSD not attached or USB port is disabled.
Ethernet Indicators CPE305 & CPE310
On Blinking Off
LED LED State CPU Operating State
100 On Green Network data speed is 100 Mbps.
Off Network data speed is 10 Mbps.
LINK On Amber The link is physically connected.
Blinking Amber Traffic is detected at the corresponding port.
Off No connection detected.