Publication 1747-UM011G-EN-P - June 2008
SLC 5/02 Hardware Components 
The table below provides a general explanation of each processor 
status indicator (for both the SLC 5/02 series B and C processor).
SLC 5/02 Status Indicators
RUN
CPU FAULT
FORCED I/O
BATTERY LOW
COMM
SLC 5/02 CPU
Battery (provides 
back-up power for 
the CMOS RAM)
Serial Number and 
Catalog Number
Memory Module 
and Socket
DH-485 
Channel 1
Left Side View
Front View
Processor 
Status 
Indicator
(1)
When It Is Indicates that
RUN 
(Color: red)
On (steady) The processor is in the Run mode.
Off The processor is in a mode other than Run.
CPU FAULT
(Color: red)
Flashing (at 
power up)
The processor has not been configured.
Flashing (during 
operation)
The processor detects a major error either in the 
processor, expansion chassis or memory.
On (steady) A fatal error is present (no communication).
Off There are no errors.
FORCED I/O 
(Color: red)
Flashing  One or more input or output addresses have been 
forced to an On or Off state but the forces have not 
been enabled.
On (steady) The forces have been enabled.
Off No forces are present or enabled.

1756-CN2 1756-CN2  1756-CN2   1756-CN2 
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Control-Techniques MD-407
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Control Techniques MAXAX 200 MAX AX 200 
Control Techniques MDA2/MDA-2
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Control techniques UD53
Control Techniques UNI140 
Control Techniques UNI1401
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Control Techniques UNI1403
Control Techniques UNI1404
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Control Techniques UNI2401
Control Techniques UNI2403 UNI-2403 
Control Techniques UNI2404
Control Techniques UNI3403 I UNI-3404
Control Techniques UN13405-R
Control Techniques UNI-3405 I UNI3405
Control Techniques EB-202 
Control Techniques EB-202-00-C01 EB20200C01
Control Techniques EB-205-00-000 
Control Techniques EI-203-00-000
Control Techniques EI-205-00-000
Control Techniques E1-202
Control Techniques EI-DN-202
Control Techniques ES-2700 2710-8001