Do-more T1H Series PLC Hardware User Manual, 1st Edition, Rev. C
3–9
Chapter 3: Specifications - CPU Modules
As mentioned in the previous table, the CPU mode can also be changed through the
programming software if the mode switch is placed in the TERM position. In this position,
the CPU can be changed remotely between the Run and Program modes. For more
information on changing CPU modes through the software, see the “Step 9: Write Project to
the Do-more PLC” section of Chapter1 “Getting Started”.
When power is applied to the system, the controller will go through it’s power-up sequence
then either stay in Program mode if the mode switch is in the STOP position, or attempt to
go to Run mode if the mode switch is in the RUN position.
If the mode switch is in the TERM position, the controller will return to the last operational
mode before power was lost. For example, if the controller was in Run mode when power
was lost, when power is restored and the mode switch is in the TERM position, the controller
will attempt to return to Run mode.
DIP Switch Specifications
Do-more controller’s circuit board has a block of DIP switches that are used to perform
various debug and reset operations. The DIP switch settings are only read when the system
is first powered up. Changing the settings of the DIP switches requires that the system
containing the controller be powered down and the CPU removed. The DIP switches can
then be changed as required. The DIP switch block is located on the right side of the CPU
under a small cover. Once the switches have been set, the CPU can then be reinstalled in the
system and powered back up.
The default position for all of the
DIP switches is OFF. The table
below describes the position and
function associated with each DIP
switch.
Do-more T1H controllers
make use of combinations of
DIP switch settings and the
Mode switch on the front of the
controller to perform two reset
functions. These reset functions
can only be performed when the
controller is in the boot loader.
7 6 5 4 3 2 1 0
ON
ON
ON
5
6 5
7
6
7
DIP Switch Settings
Switch
Number
Switch
Position
Function
0
ON
Load the last copy of the operating system.
1
ON
Do not load an Operating System, stay in the Booter.
2
ON
Disable the hardware watchdog timer - the hardware watchdog
is always enabled, but this switch allows the user to override the
ability of the Force Watchdog Error (WATCHDOG) and Debug
Mode to generate a Watchdog condition.
3
ON
Disable ability to update the firmware and/or gate array.
4
ON
Reserved
5
ON
6
ON
7
ON
Reset the TCP/IP Network Settings to factory default values -
Must be used with DIP #1
All 8
ON
Clears everything from the controller
(see details in the following pages)
