7. Maintenance
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Graphic Display
The graphic display available in the Nexto Series CPUs is an important tool for the process control,
as through it is possible to recognize possible error conditions, active components or diagnostics
presence. Besides, all diagnostics including the I/O modules are presented to the user through the
graphic display. For further information regarding the diagnostic key utilization and its visualization
see One Touch Diag section.
Below, on Figure 7-9 it is possible to observe the available characters in the Nexto CPU graphic
display and, next, its respective meanings.
Figure 7-9. CPU Status Screen
Legend:
1. Indication of the CPU status operation. In case the CPU application is running, the state is Run.
In case the CPU application is stopped, the state is Stop. For further details, see Run Mode and
Stop Mode section.
2. Memory Card presence indication. Further details regarding its installation see Memory Card
chapter.
3. COM 1 traffic indication. The up arrow (▲) indicates data transmission and the down arrow (▼)
indicates data reception. For further information regarding the COM 1 interface see Serial
Interfaces section.
4. COM 2 traffic indication. The up arrow (▲) indicates data transmission and the down arrow (▼)
indicates data reception. For further information regarding the COM 1 interface see Serial
Interfaces section.
5. Indication of the CPU active diagnostics quantity. In case the number shown is different than 0
(zero), there are active diagnostics in the CPU. For further details regarding their visualization on
the CPU graphic display, through diagnostic key, see One Touch Diag section.
6. Forced variables in the CPU indication. In case the “F” character is shown in the graphic display,
a variable is being forced by the user, whether symbolic, direct representation or AT. For further
information regarding variable forcing see Run Mode section.
7. Identification of the CPU redundancy state (message only valid in NX3030 in redundant mode).
If the CPU is the active PLC, the ACT information will be presented. The other possible states
are NCF (Not-configured), STR (Starting), INA (Inactive) and SBY (Stand-by).
8. Indication that the project synchronization is being executed. The up arrow (▲) indicates project
data transmission and the down arrow (▼) indicates project data reception. For further
information about the project synchronization see Project Synchronization section.
Besides the characters described above, Nexto CPUs can present some messages on the graphic
display, correspondent to a process which is being executed at the moment.
Table 7-31 present the messages and their respective descriptions:
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