A full clearance of the controller's memory requires about 2 days, power off, and
battery connection removed. A quick way to force a controller to enter a "No Conf"
mode is to disconnect the communication cable during the download process of an
application project whose configuration is different from the one staying in the
controller's memory. Pay attention, anyway: this type of operation doesn't realize a
complete reset of the memory (e.g. the communications parameters are not reset)
Checking the
CPU’s Status
At this stage, look at the controller's front panel. The COM LED is blinking, and the
STS LED is in a steady-on state. This condition usually indicates that the system is
not redundant and that the controller's Redundant Copro completed both its boot
after a power up and its self-tests.
The keypad should display a "Run Primary" indication (in the relevant case, just act
on the ESC key in order to make the keypad display its first "page").
4 This action opens a dialog box showing the project name, its version number and
the date and time of the last build.
Note: As far as the controller's memory is supposed to be cleared on a new CPU
unit, these kinds of information are available for the "PC project" only, and not for
the due to be "Overwritten PLC Project".
5 At the end of this transfer, confirm the switch to the Run State for this Project by
clicking OK in the Run dialog.
Step Action
Run
Cancel
PLC Project:
OK
Name: Station
Version: 0.0.53
Last Build: 25/02/2004 13:39:31
Confirm Run on this Project?
COM
STS
Setting-up
20
Setting-up the
Standby-to-be
Controller
You may now power up the second controller, which will be the Standby-to-be
controller.
It's supposed here that the Standby unit controller's memory is clear or at least in a
"No Conf" state. In these circumstances, the memory update of the Standby unit,
starting from the Primary unit's memory, will be done automatically. An automatic
transfer should also occur when the configuration staying in the Standby-to-be
controller is different from the one staying in the Primary Controller.
In a first step, the keypad of this second controller displays "Initializing" for a few
seconds after the power up. During this phase, looking at this controller's front panel,
you should notice that the STS LED is lit in a steady on state, indicating that the
system is not (yet) redundant. By the way, this also indicates that the controller's
Redundancy Copro has done its boot after a power up, and has ended its self-tests.
The COM LED is off for a while, indicating there is no communication activity
between Primary and Standby controllers.
