Switch Function - SICK T&D PBS Mode D'emploi

7. Starting, operation
Operating Instructions PBS

Switch function

Hysteresis function
If the system pressure fluctuates around the nominal value, the
hysteresis keeps the switch status of the outputs stable. When the
system pressure is rising, the output switches when it reaches the
respective set point (SP); if the pressure falls again, the output swit-
ches back only if the reset point (RP) is reached.
Application example: loading an accumulator.
The shut-off valve loads up to 8o bar and then shuts off. When 70
bar is reached again, it switches on once more.
Window function
The window function allows the monitoring of a defined range.
If the system pressure is between the window high (FH) and the
window low (FL), the output is activated (NO) respective
deactivated (NC).
Delay times (0.00 to 50 s):
By this means unwanted pressure peaks of short duration or high
frequency can be filtered out.
The pressure must remain for at least this time to enable the switch
to operate. The switching output does not immediately change its
status when it reaches the switching event, but only after the delay
time has elapsed. If the switching event no longer pertains when the
delay time has elapsed, the switching output does not change.
38 © SICK AG • Germany • All rights reserved • Subject to change without notice 8013154/U275/2010/02/01