Run/Stop Mode Switch Operation; Configurable Run/Stop Mode Operation; Configurable Memory Protection; Summary Of Cpu Switch Run/Stop Operation - GE VersaMax PLC User Manual

7.6 Run/Stop Mode Switch Operation

Run/Stop Mode
Configuration
Off
On
On
Off
On
On
100 GFK-1503E
For public disclosure
The CPU Run/Stop mode switch can be configured to place the CPU in Stop or Run
mode. It can also be configured to prevent writing to program or configuration memory
and forcing or overriding discrete data. It defaults to enabled Run/Stop mode selection
and disabled memory protection.

7.6.1 Configurable Run/Stop Mode Operation

If Run/Stop mode switch operation is enabled, the switch can be used to place the CPU in
Run mode.
• If the CPU has non-fatal faults and is not in Stop/Fault mode, placing the switch in
Run position causes the CPU to go to Run mode. Faults are NOT cleared.
• If the CPU has fatal faults and is in Stop/Fault mode, placing the switch in Run
position causes the Run LED to blink for 5 seconds. While the Run LED is blinking,
the CPU switch can be used to clear the fault table and put the CPU in Run mode.
After the switch has been in Run position for at least ½ second, move it to Stop
position for at least ½ second. Then move it back to Run position. The faults are
cleared and the CPU goes to Run mode. The LED stops blinking and stays on. This
can be repeated if necessary.
• If the switch is not toggled as described, after 5 seconds the Run LED goes off and
the CPU remains in Stop/Fault mode. Faults stay in the fault table.

7.6.2 Configurable Memory Protection

Operation of the switch can be configured to prevent writing to program memory and
configuration, and to prevent forcing or overriding data.

7.6.3 Summary of CPU Switch Run/Stop Operation

I/O Scan Stop
Switch Position
Configuration
has no effect has no effect
has no effect
has no effect
Toggle Switch from
has no effect
Stop to Run
Toggle switch from
No
Run to Stop
Toggle switch from
Yes
Run to Stop
CPU Operation
All modes are allowed.
Run/On All modes are allowed.
CPU not allowed to go to
Stop/Off
Run mode.
CPU goes to Run mode if no
fatal faults are present;
otherwise, the Run LED
blinks for 5 seconds.
PLC goes to STOP–NO IO
PLC goes to STOP–IO
VersaMax PLC User Manual