Publication 1747-UM011G-EN-P - June 2008
SLC 5/01 Hardware Components
The table below provides a general explanation of the SLC 5/01 
processor status indicators.
SLC 5/01 Status Indicators
PC RUN
CPU FAULT
FORCED I/O
BATTERY LOW
SLC 5/01 CPU
Memory 
Module and 
Socket
Left Side View Front View
DH-485 
Channel 1
Battery 
(provides back-up 
power for the 
CMOS RAM)
Serial Number and Catalog Number
Processor 
Status 
Indicator
(1)
(1)
See chapter 10 for more information on status indicator status.
When It Is Indicates that
PC 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, 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.
BATTERY LOW 
(Color: red)
On (steady) The battery voltage has fallen below a 
threshold level or the battery and the battery 
jumper are missing.
Off  The battery is functional, or the battery 
jumper is present.Control Techniques MD-434-00-000
Control Techniques MP-5000
Control Techniques MD100
Control Techniques MD200 9300-5200 MD-200
Control-Techniques MD-407
Control Techniques MD407 MP-1250 #7852SO
Control Techniques MD 407-000-000
Control Techniques MAXAX 200 MAX AX 200 
Control Techniques MDA2/MDA-2
Control Techniques MDA-2B 
Control techniques UD53
Control Techniques UNI140 
Control Techniques UNI1401
Control Techniques UNI1402
Control Techniques UNI1403
Control Techniques UNI1404
Control Techniques UNI1405
Control Techniques UNI2401

1756-IR6I  1756-IR6I  1756-IR6I  
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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