Keyswitch for the 
SLC 5/03, SLC 5/04, and 
SLC 5/05 Processors
The SLC 5/03, SLC 5/04, and SLC 5/05 processors include a 3-position 
keyswitch on the front panel that lets you select one of three modes of 
operation: RUN, PROGram, and REMote. You can remove the key in each of 
the three positions.
RUN Position
This position places the processor in the Run mode. The processor 
scans/executes the ladder program, monitors input devices, energizes 
output devices, and acts on enabled I/O forces. You can only change 
the processor mode by changing the keyswitch position. You cannot 
perform online program editing.
To change the processor mode to Run, toggle the keyswitch from 
PROG or REM to RUN. When the keyswitch is left in the RUN 
position, you cannot use a programmer/operator interface device to 
change the processor mode.
PROG Position
This position places the processor in the Program mode. The 
processor does not scan/execute the ladder program, and the 
controller outputs are de-energized. You can perform online program 
editing. You can only change the processor mode by changing the 
keyswitch position. 
To change the processor mode to Program, toggle the keyswitch from 
REM or RUN to PROG. When the keyswitch is left in the PROG 
position, you cannot use a programmer/operator interface device to 
change the processor mode.
ATTENTION
Depending on the size of your user program, the processor can 
take up to 2.5 s to change modes when you change the position 
of the keyswitch from RUN to PROG or to REM. Do not use the 
keyswitch in place of a hardwired master control relay or an 
emergency-stop switch.
IMPORTANT
The SLC 5/01 and SLC 5/02 processors do not have a keyswitch. 
Therefore, all modes must be changed via the communication 
channels.
Publication 1747-UM011G-EN-P - June 2008Siemens AMS-P216-A32 C8451-A45-A12-2
Siemens AMS-P217-A32 
Siemens SMP-E120-01
Siemens SMP-E129 C8451-a11-a30
Siemens SMP-E131 
Siemens SMP-E132 
Siemens SMP-E2-A3 
Siemens SMP-E20 C8451-A17-A26-7
Siemens SMP-E200-3 
Siemens SMP-E200-A1 C61451-A89-C3-2
Siemens SMP-E200-A1 C8451-A1-A191-1
Siemens SMP-E204-A1 C8451-A1-A33-1
Siemens SMP-E211-01 C61451-A68-C7-3
Siemens SMP-E211-02 C61451-A68-C7-3
Siemens SMP-E211-A11 C8451-A1-A107-3
Siemens SMP-E212 C61451-A89-C8-3
Siemens SMP-E212-01 C61451-A89-C8-3
Siemens SMP-E218-A1 
Siemens SMP-E220-3

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Siemens SMP-E220-A1
Siemens SMP-E221-A1
Siemens SMP-E224 C8451-A12-A76-1
Siemens SMP-E230-A1
Siemens SMP-E240-2 C61451-A89-C12-2
Siemens SMP-E302-03 
Siemens SMP-E302-04 
Siemens SMP-E302-A11 
Siemens SMP-E302-A11
Siemens SMP-E306-A1 C8451-A14-A4
Siemens SMP-E4-A3 C8451-A1-A66-3
Siemens SMP-E423-A30