6.4 Limit Values
For monitoring the measured values each measuring channel allows for
programming 2 limit values; generally, a maximum and a minimum value.
When limit values are exceeded the corresponding control lamp (3) will be on.
If the optionally available limit value relays (option G1 or G2) have been
integrated, the related contacts (6), which can be used for activating an alarm
circuitry, will also respond. The alarm condition will be maintained until all
measured values have dropped below the limit values by as much as the
hysteresis. If an alarm cable is not connected, the function of the internal relays
can be configured as with the output modules (see man. 6.10.9). The relay
condition will, then, also appear in the device programming (man. 6.2.5).
The
hysteresis
(usually 10 digits) can be set in function ´
HY
´ within a range
from 00 to 99 digits.
As a standard, limit value 1 is programmed as max value (function ´
H1
´) and
limit value 2 as min value (function ´
L2
´). The switch function can be changed if
2 max values or 2 min values are required.
Reprogramming of the Limit Value Function
Select limit value 1 or 2 by using key
F2
and press key
ENTER
so the first digit
flashes. Then, press and hold the key
ENTER
. The function ´
L1
´(Lo) will be
displayed instead of ´
H1
´(Hi) and ´
H2
´(Hi) will be displayed instead of ´
L2
´(Lo).
Function LIMIT VALUE 1 MAX
´
H1
´ and
LIMIT VALUE 2 MIN
´
L2
´
Selection with key
F2...
...
F2
1
2
3
.
0
H
1
Programming:
Input according to 5.4
Switching off:
,
ENTER
CLR
-
-
-
-
H
1
Switching on again:
,
,
,
,
,
ENTER
▲
▲
▲
▲
▲
Press the key
ENTER
six times. The display
will return to the previously programmed value.
Change the function:
,
ENTER
ENTER
1s
1
2
3
.
0
L
1
Function HYSTERESIS
´
HY
´
Selection with the
F2...
...
F2
1
0
H
Y
Programming:
Input according to 5.4
1
2
3
.
0
H
1
ALMEMO
4490-2
21
Sensor Programming
