Startup and Maintenance
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9.8 Faults
9.8.1 Faults in the Central Device
If there are faults in PES with redundant central modules, the device without failure takes over
the operation without interruption. The diagnosis display on the functioning central module in-
dicates MONO.
If there is a faulty central module in PES with one central module only, this mostly results in a
switch-off of the PES.
The diagnosis display of the faulty central module shows STOP.
If the buttons on the front of the faulty central module are pressed, the error codes of the faults
are displayed (refer to the manual operating system).
Note:
Before pushing the Ack button, the history of the registered faults (Control Panel, Display of
the error status of the CPU) can be saved in a file. By pushing the Ack button the RAM memory
of the CPU with all saved error messages will be deleted!
When the programming device is connected it offers the possibility to display the occurred er-
rors. These values are stored in the RAM (memory) of the PES. These values are important to
get a clear analysis of the errors. They should be stored with "Print" or "Export" (refer to the
online help of ELOP II).
If the central module is replaced, the correct switch positions and correct version of the oper-
ating system (on the display) have to be regarded (for insertion and removing of modules within
the central rack refer to chapters 8.1.3 and 8.1.4).
If the user program has to be loaded after exchanging the central module at redundant systems
the following has to be regarded:
– the user program can be loaded at redundant systems via the procedure "Self-education"
(see also the description in the operating system manual and the corresponding data
sheet of the CPU).
– make sure that the correct central module will be loaded
– additionally the code version of the existing user program in the running central module
and the user program to be loaded in the changed module must be the same.
9.8.2 Faults in the Input/Output Modules
Faults in safety-related input/output modules are recognized automatically by the PES during
operation, and they are displayed on the diagnosis display by I/O error with the indication of
the faulty position.
If an input/output module has a line monitoring also the feeding lines to sensors and actuators
are checked and faults are indicated on the diagnosis display additionally with the defective
channel number. In this case also the external wiring has to be checked but the module must
not be changed.
The effect of faulty channels of not safety-related input/output modules will be the difference
between the signal status in the logic and of the appertaining LEDs on the cable connectors.
If the logic signal does not match the LED display, the respective input/output module must be
exchanged. For output modules you should first check whether the control element works or
there is a line disturbance.
Input/output modules can be inserted and pulled out during operation. For insertion and remov-
ing of input/output modules refer to chapter 8.1.1.
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