CP 503/A, CP 505/A,D,K, CP 507/
A,C
Operating behavior
Project engineering manual V1.06
63
© KEBA 2021
8.4
USB overload switch-off
An overload of one of the USB connections at the CP 50x/x results in a
switch-off of the ports. This remains as long as the overload is present.
8.5
Response to module errors
If a module error occurs during start-up, the current status is shown on the
diagnostic display on the front panel.
This may have the following causes:
●
Storage medium not present or faulty: Check or replace the storage
medium.
●
Hardware error: Send device in for repair.
8.6
Watchdog
●
For devices with inputs and outputs, the IO watchdog checks if the CPU
executes the data transfer with the IOs regularly and will be triggered in
case of an error. In this case all digital outputs will be immediately
switched off and all analog outputs are set to 0 V. The CPU continues to
run for diagnostics purposes.
●
The CPU watchdog monitors the principal function of the CPU and runs
independent from the IO watchdog. After the CPU watchdog responds,
all retain data will be saved, all device outputs switched off and then the
device is reset.
8.7
Failure of power supply
A restart of the CP 50x/x is triggered for a total power supply failure > 10 ms.
After 1 ms remote KEBA input/output modules go to a defined state (off-
state).
The CP 50x/x has a 512 kB SRAM for permanent storage of fast-retain data
(64 kB) and slower ratain data (192 kB). Data in the battery-buffered SRAM
(ratian data) remain intact and the real-time clock (RTC) continues to run.
For the switch off protection of a complete system appropriate concepts
have to be realised at the application level (e.g. integration of an external
USP).
8.8
Battery monitoring system
The CP 50x/x has a replaceable battery. The battery supplies the SRAM and
the real-time clock (RTC) when the 24 V supply is turned off.
