Publication 1747-UM011G-EN-P - June 2008
•multi-point list.
•UL listed to US and Canadian Safety Standards, CE compliant, 
C-Tick marked.
This figure below shows some of the hardware components of the 
SLC 5/04 processors (1747-L541, 1747-L542, or 1747-L543).
SLC 5/04 Hardware Components
The table below provides a general explanation of each processor 
status indicator on the SLC 5/04 processors.
SLC 5/04 Status Indicators
FORCE
DH+
RS232
RUN
FLT
BATT
RUN REM PROG
SLC 5/04 CPU
Memory 
Module
Left Side View Front View
DH-485, DF1, 
or ASCII 
Channel 0
Battery 
(provides 
back-up 
power for the 
CMOS RAM)
Serial Number and 
Catalog Number
DH+ 
Channel 1
Keyswitch
Operating System Download Protection Jumper 
– do not move unless updating processor 
Operating System firmware.
Processor 
Status 
Indicator
(1)(2)
When It Is Indicates that
RUN 
(Color: green)
On (steady) The processor is in the Run mode.
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.
FLT
(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.Control Techniques SK2403
Control Techniques SP1401 UNIDRIVE
Control Techniques SX23400400PB
Control Techniques BV524/16-14-12
Control Techniques FNC5-004 
Control Techniques VBE150
Control Techniques RG6041-8000
Control Techniques SE53403000 
Control Techniques 0400-0023
Control Techniques 2950-8400
Control Techniques 60X3/6
Control Techniques 8200-00074
Control Techniques 8200-00082
Control Techniques 8200-00153
Control Techniques 9600-6400 DominAx DD400
Control Techniques C80030
Control Techniques CD2DBU
Control Techniques CD75
Control Techniques CDE50HPICD
Control Techniques CDE15HPICD
Control Techniques CTIU200D-001

1756-PB75  1756-PB75  1756-PB75   

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Control Techniques VBE 150-R 
Control Techniques ES20500
Control Techniques Digitax ST DST1401P 1401
Control Techniques DIN1220220B
Control Techniques DIN3220220B #6737LR
Control Techniques DIN3380300B
Control Techniques DIN338040B
Control Techniques DIN3380075B #6736a