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Outputs
Function
Settings
Function
98
6.6.4 Limit indicator
The characteristic of the limit indicator is laid down in the Limit value UL, Limit
value LL, Hysteresis UL and Hysteresis LL settings. The fundamentals of the
function are described in the introductory chapter (see section 6.2.2).
In order to set up the Limit indicator function for a relay output, the relay output
must be linked with a sensor (see section 6.4).
Setting
Limit values
Limit value UL
Limit value LL
Hysteresis UL
Hysteresis LL
Behavior at error
Action
Switching delay
6.6.5 Frequency controller
The characteristic of the frequency output is laid down in the Start value, End
value, Frequency (f) min. and Frequency (f) max. settings. The fundamentals of
Selection/Values
UL main variable
LL main variable
UL adjoining var.
LL adjoining var.
Upper or lower limiting
value
Any value within the
measuring range
(sensor-dependent)
0 - 5% of the
measuring range
Open
Close
Unchanged
Open
Close
0 ... 3600 s
Explanation
Main variable designates the
actual measured parameter of
the sensor (e.g. pH, oxygen,
etc.).
Adjoining variable designates
an additional measured
parameter (e.g. temperature).
Minimum difference between
the upper and lower limit
value:
5 % of the measuring range
Hysteresis for Limit value UL
and Limit value LL.
The relay opens, closes or
remains unchanged in the
case of system errors or
sensor errors (see page 112).
Relay action (see
section 6.6.1)
The time period for which a
limiting value must be
exceeded before the relay
operates.
Prevents frequent switching
for measured values that are
close to the limiting value.
ba77244d01
DIQ/S 281
08/2020
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