Operation LF 170
102
ba54104e09 11/2010
Switching behavior
(normally closed/open)
The relay can be configured as normally closed or open for the
functions FrC (Freeze) and UL.LL (limits). The relay works as normally
open for all other functions.
Note
The switching behavior is set in the configuration level (section 4.4.2).
4.6.2 Limit indicator
Basics With a limit indicator, a relay switches when a specified limiting value is
exceeded or undercut. The switching contact opens or closes
according to the selected switching behavior.
Limit indicators can be used in the following way:
z Monitoring a limiting value using a relay:
When a limiting value (upper or lower limiting value) is exceeded or
undercut, a relay switches.
z Monitoring two limiting values using two relays:
If the upper limiting value is exceeded or undercut, a relay switches
and, if the lower limiting value is exceeded or undercut, another
relay switches.
CS (Cleaning System) The relay controls an external sensor
cleaning unit. The relay works as a closer
(i.e. normally open). During the cleaning
process the measured value is frozen.
The parameterization of the relay is
described in section 4.6.3.
Function Description
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