7. Maintenance
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System Log
The System Log is an available feature in the MasterTool IEC XE programmer. It is an important
tool for process control, as it makes it possible to find events on CPU that may indicate error
conditions, presence of active components or active diagnostics. Such events can be viewed in
chronological order with a resolution of milliseconds, with a storage capacity of up to one thousand
log entries stored in the CPU internal memory, that can’t be removed.
In order to access these Logs, just go to the Device Tree and double-click on Device, then go to the
Log tab, where hundreds of operations can be seen, such as: task max cycles, user access, application
download, online change, application download and upload, application synchronization between
CPUs, firmware update between another events and actions.
In order to view the Logs, just need to be connected to a CPU (Selected Active Path) and click on
. When this button is pressed the Logs are displayed and updated instantly. When the button is
not being pressed the Logs will be hold in the screen, it means, these button has two stages, one hold
the logs state being updated and in the state the updating is disabled. To no longer show the Logs,
press .
It is possible to filter the Logs in 4 different types: Warning(s), Error(s), Exception(s)and
Information(s).
Another way to filter the messages displayed to the user is to select the component desired to view.
The Log tab’s Timestamp is shown by MasterTool after information provided by the device (CPU).
MasterTool can display the Timestamp in local time (computer’s time) or UTC, if UTC Time
checkbox is marked.
ATTENTION:
If the device’s time or time zone parameter are incorrect, the Timestamp shown in MasterTool also
won’t be correct.
For further information about the System Logs please check the MasterTool IEC XE User Manual –
MU299609 and the RTC Clock and Time Synchronization subchapter of this manual.
ATTENTION:
The system logs of the Nexto series CPUs, starting in firmware version 1.4.0.33, are reloaded in the
cases of a restart of the CPU or a reboot of the Runtime System, that is, it will be possible to check
the older logs when one of these situations occurs.
Not Loading the Application at Startup
If necessary, the user can choose to not load an existing application on the CPU during its startup.
Just power the CPU with the diagnostics button pressed and keep it pressed for until the message
“APP. NOT LOAD” is shown in the screen. .. If a login attempt is made, MasterTool IEC XE
software will indicate that there is no application on the CPU. For reloading the application, the CPU
must be reset or a new application download must be done.
Power Supply Failure
The Nexto Series Power Supply (NX8000) has a failure detection system according to the levels
defined in its technical features (see Power Supply 30 W 24 Vdc Technical Features - CE114200).
There are two ways to diagnose a failure.
1 – In case the NX8000 power supply is on with voltage lower than the required minimum limit, a
power supply failure diagnostic is generated, which is recognized by the CPU and the message
“POWER SUPPLY FAILURE” is shown on the display. When the supply is within the established
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