DL06 Micro PLC User Manual, 3rd Edition, Rev. E
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Chapter 3: CPU Specifications and Operation
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Changing Modes in the DL06 PLC
There are two ways to change the CPU mode. You can use the CPU mode switch to select
the operating mode, or you can place the mode switch in the TERM position and use a
programming device to change operating modes. With the switch in this position, the CPU
can be changed between Run and Program modes. You can use either
Direct
SOFT or the
Handheld Programmer to change the CPU mode of operation. With
Direct
SOFT use the
PLC menu option
PLC > Mode
or use the
Mode
button located on the Online toolbar.
With the Handheld Programmer, you use the MODE key.
Mode of Operation at Power-up
The DL06 CPU will normally power-up in the mode that it was in just prior to the power
interruption. For example, if the CPU was in Program Mode when the power was disconnected,
the CPU will power-up in Program Mode (see warning note below).
WARNING: Once the super capacitor has discharged, the system memory may not retain the
previous mode of operation. When this occurs, the PLC can power-up in either Run or Program
Mode if the mode switch is in the term position. There is no way to determine which mode will
be entered as the startup mode. Failure to adhere to this warning greatly increases the risk of
unexpected equipment startup.
The mode which the CPU will power-up in is also determined by the state of B7633.13. If
the bit is set and the Mode Switch is in the TERM position, the CPU will power-up in RUN
mode. If B7633.13 is not set with the Mode Switch in TERM position, then the CPU will
power-up in the state it was in when it was powered-down.
Mode Switch Position
CPU Action
RUN (Run Program)
CPU is forced into the RUN mode if no errors are encountered.
No changes are allowed by the attached programming/
monitoring device.
TERM (Terminal) RUN
PROGRAM and the TEST modes are available. Mode and
program changes are allowed by the programming/monitoring
device.
STOP
CPU is forced into the STOP mode. No changes are allowed by
the programming/monitoring device.
PLC Menu
MODE Key