7. Maintenance
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7. Maintenance
Module Diagnostics
One feature of the Nexto Series is the abnormality diagnostic generation, whether they are failures,
errors or operation modes, allowing the operator to identify and solve problems which occurs in the
system easily.
The Nexto CPUs permit many ways to visualize the diagnostics generated by the system, which are:
ï‚· One Touch Diag
ï‚· Diagnostics via LED
ï‚· Diagnostics via WEB
ï‚· Diagnostics via Variables
ï‚· Diagnostics via Function Blocks
The first one is an innovating feature of Nexto series, which allows a fast access to the application
abnormal conditions. The second is purely visual, generated through two LEDs placed on the panel
(DG and WD) and also through the LEDs placed in the RJ45 connector (exclusive for Ethernet
connection). The next feature is the graphic visualization in a WEB page of the rack and the
respective configured modules, with the individual access allowed of the operation state and the
active diagnostics. The diagnostics are also stored directly in the CPU variables, either direct
representation (%Q) or attributed (AT variable), and can be used by the user application, for instance,
being presented in a supervisory system. The last ones present specific conditions of the system
functioning.
These diagnostics function is to point possible system installation or configuration problems, and
communication network problems or deficiency.
One Touch Diag
The One Touch Diagnostics , or single touch, is an exclusive feature the Nexto Series brings for the
programmable controllers. With this new concept the user can verify the diagnostics of any module
connected to the system straight on the CPU graphic display with a single touch on the module
Diagnostic Switch. This is a powerful diagnostic tool which can be used off-line (with no need of
supervisory or programming software) making easier to find and solve quickly possible problems.
The diagnostics key is placed on the CPU upper part, in an easy access place and, besides giving
active diagnostics, allows the access to the navigation menu, described in the CPU’s Informative and
Configuration Menu chapter. Figure 7-1 shows the CPU switch placement:
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General