Actions Triggered By Limit Value Infringement; Analog Output - Ahlborn ALMEMO 710 Operating Instructions Manual

channels but this can be adjusted to any number of digits between 0 and 99 (see
13.2.7.1). A limit value infringement can also be used to start or stop a measur-
ing operation (see 13.2.8).
13.2.7.1 Hysteresis
The hysteresis for canceling an alarm triggered in the event of a limit value in-
fringement can be set generally for all sensors to any number between 0 and
99 digits (default 10 digits) in the ´Hysteresis´ function. (see 13.2.7 and Man-
ual 6.2.7).

13.2.8 Actions triggered by limit value infringement

Relay assignment
As ´Limit value actions´ in the event of a limit value infringement each limit
value can, for the purpose of reporting the alarm, be assigned a ´Relay - maxi-
mum´ or ´Relay - minimum´ on relay adapter ZA 8006-RTA3; this does not
apply to general alarms. The relay remains energized until the measured value
returns to within the prescribed limit values by the amount set as hysteresis.
(see 13.2.7) If no limit value has been set the measuring range limit is used as
limit value. A sensor breakage always triggers an alarm.
A relay can have more than one limit value assigned to it. For this purpose the
relay cables offer 2 relays (0 and 1); the relay adapter (ZA 8006-RTA3) offers
from 4 to 10 relays. (see 13.5.2, Manual 6.10.9).
Controlling a measuring operation
A limit value infringement can be used not
only to report an alarm but also to control a
measuring operation.
Commands can be assigned to a limit value
maximum or limit value minimum via func-
tions ´Action maximum´ and ´Action mini-
mum´. These functions can, by means of a
selection box, have the following actions as-
signed to them : To delete a setting, ´Alarm only´ should be selected again.

13.2.9 Analog output

Analog output of measured values to analog output modules (see Manual 5)
must usually be scaled to a certain sub-range. The display range can be
specified in menu ´Analog output´ by entering ´Analog start´ and ´Analog
end´. This sub-range is then mapped to analog range 2 V, 10 V, 20 mA.
These two parameters, are also saved in the sensor's EEPROM and can thus
be individually programmed per channel; i.e. when channels are switched
through manually each measurable variable can be individually scaled.
Switchover from 0-20 to 4-20 mA can also be activated in this menu. (Element
flags, see 13.2.13.6).
(see Manual 6.6.3)
Channel functions
Alarm only
Start measuring
Stop measuring
Individual meas. operation, ´Manual´
Set timer 2 to zero
Macros 5 to 9
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