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Tech Note: Internal Supply Voltage Control
Products:
Revision: R100
For all SLS-500 Main Controllers and all SLS-500-Configurator versions
Internal +24V control for SLS-500 Main-
Controllers
All modules have an internal voltage control, to
guarantee that the extension modules and the main
controller are switched off correctly in the case of a
voltage drop.
The internal power fail-logic monitors the 24-V-voltage
permanently. If the voltage drops below a certain
threshold, the internal CPU program will be informed
and the communication with the extension modules
and the running SLS-500-Configurator program will
be stopped. After that the control will continue to
monitor whether the voltage stays below this crucial
threshold. If this is the case, no SLS-500-Configurator
program will be executed. If the voltage returns to a
normal level, a pause of 2 seconds will be made. After
this break the SLS-500 module and the SLS-500-
Configurator program will be reactivated and all
extension modules will be restarted.
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Tel: +43-3159-3001, Fax: +43-3159-30014, e-mail: hiquel@hiquel.com http: www.hiquel.com
Because of the internal voltage control of the SLS-500
PLCs it is guaranteed that the connected extension
module and the bus-system do only work if the supply
voltage is correct. If there is a short-term voltage drop
in an application, the main controller will shutdown the
running program and will restart it if the voltage
returns to a normal level.
This provides a secure operation of the modules, also
with large spread facilities.