11. Programming With Programming-Menus
60
11.3.5
Limit Values
Two limit values (MAX, MIN) can be programmed and allocated to each meas-
uring channel. An exceeding of limit values is handled as a fault, similar to an
exceeding of meas. range limits and sensor breakage. On the display a corre-
sponding arrow
or
will appear next to the measured value and the alarm
relays of a connected relay cable will respond (s. 11.6.2). Relays can also be
assigned to limit values (s. 11.4.3). The alarm condition will persist until the
measured value has dropped below the limit value by the Hysteresis. Generally,
the hysteresis is set to 10 digits, however, it can be adjusted to values between
0 and 99 digits (s. 11.5.7). The exceeding of a limit value can also be used to
start or stop a measurement (s. 11.4.3).
Function:
Enter limit value max (s. 9.5):
7 Limit max: 123.4°C
Limit value min:
7 Limit min:
-----°C
Switching off the limit value:
<OFF>
Switching on the limit value:
<ON>
11.3.6
Scaling, Decimal Point Setting
For indicating the electrical signal of a sensor as a measured value of a physical
variable it is, in most cases, necessary to set a zero point shift and to perform a
multiplication with a certain factor. The functions BASE and FACTOR are avail-
able for this. A detailed description of the scaling, including an example, can be
found in the manual section 6.3.11.
Indicated value
= (Corrected Measured Value - BASE) x FACTOR.
The FACTOR can be programmed in the range from -2.0000 to +2.0000. For
factors over 2.0 or under 0.2 a corresponding decimal point setting must be
considered by entering the EXPONENT. The EXPONENT allows to shift the
decimal point to the left (-) or right (+) as far as it can be indicated on the display.
An exponential presentation of the measured
values is not possible.
For automatic calculation of the scaling values:
5
Base
: ------
5 Factor: ------
5 Exponent: 0
In the
ASSISTANT Menus
there is an extra
menu
Scaling
consisting of actual and setpoint
values.
The correction arrow
º
will be indicated as sta-
tus of the measured value (s. 9.3), if scaling val-
ues have been programmed and the actual
measured value has been altered.
SCALING
Connector: 0 Channel: 00
Actual value 1:
4.000 mA
Actual value 2:
20.000 mA
Decimal places:
1
2 Dimension:
°C
Setpoint 1:
-100.0 °C
Setpoint 2:
400.0
°C
5 Base:
720.0 °C
5 Factor:
0.3125
5 Exponent:
2
4 Slope correct: ------
00: 27.0 °C
OK F ESC
