Specifications
5–1
1Identifying the Components of Your Processor
Publication
1747-6.2
The table below provides a general explanation of each processor
status LED on the SLC 5/04 processors.
➀➁
Processor LED When It Is Indicates that
On (steadily) The processor is in the Run mode.
RUN
(Color: green)
Flashing (during operation)
The processor is transferring a program from RAM to the
memory module.
Off The processor is in a mode other than Run.
Flashing (at power up) The processor has not been configured.
FLT
( olo )
Flashing (during operation)
The processor detects a major error either in the processor,
expansion chassis or memory.
(
C
olo
r:
red
)
On (steadily) A fatal error is present (no communications).
Off There are no errors.
BATT
( olo )
On (steadily)
The battery voltage has fallen below a threshold level, or the
battery or the battery jumper is missing or not connected.
(
C
olo
r:
red
)
Off The battery is functional, or the battery jumper is present.
FO
R
CE
Flashing
One or more input or output addresses have been forced to an
On or Off state but the forces have not been enabled.
FO
R
CE
(Color: amber)
On (steadily)
The forces have been enabled.
Off No forces are present or enabled.
DH+
( olo n o
On (steadily)
The Communications Active Bit (S:1/7) is set in the System
Status file and processor is actively communicating on the
network.
(Color: green or
)
Flashing Green There are no other active nodes on the network.
red
)
Flashing Red
There are duplicate nodes on the link with the same node
address.
On (steadily)
DF1 Mode
The SLC 5/04 processor is transmitting on the network.
Off
DF1 Mode
The SLC 5/04 processor is not transmitting on the network.
On (steadily)
ASCII Mode
The SLC 5/04 processor is transmitting on the network.
RS232
(Color: green)
Off
ASCII Mode
The SLC 5/04 processor is not transmitting on the network.
On (steadily)
DH485 Mode
The Communications Active Bit (S:1/7) is set in the System
Status file and the processor is actively communicating on the
network.
Flashing
DH485 Mode
The processor is trying to establish communications, but there
are no other active nodes on the network.
Off
DH485 Mode
A fatal error is present (no communications).
➀
If
the LEDs on the SLC 5/04 turn on in a predefined sequence, the SLC 5/04 is in the process of
downloading a new operating system.
➁
See chapter 10 for more information on LED status.