7.6
Run/Stop Mode Switch Operation
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
Run/Stop Mode
Configuration
I/O Scan Stop
Configuration
Switch Position
CPU Operation
Off
has no effect
has no effect
All modes are allowed.
On
has no effect
Run/On
All modes are allowed.
On
has no effect
Stop/Off
CPU not allowed to go to
Run mode.
Off
has no effect
Toggle Switch from
Stop to Run
CPU goes to Run mode if no
fatal faults are present;
otherwise, the Run LED
blinks for 5 seconds.
On
No
Toggle switch from
Run to Stop
PLC goes to STOP–NO IO
On
Yes
Toggle switch from
Run to Stop
PLC goes to STOP–IO
100
GFK-1503E
VersaMax PLC User Manual
For public disclosure
Summary of Contents for VersaMax PLC
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