Hach-Lange SI794 P User Manual - Manual (Page 27)

27
External activation of HOLD mode
The Hold mode can be activated from outside by sending a signal
to the Hold input (e.g. from the process control system).
Hold active Hold inactive
10 ... 30 V AC/DC 0 ... 2 V AC/DC
6
7
Hold
input
Process control system
Power supply
12...24 V AC/DC
si794
The alarm LED on the front panel can be configured as follows
HOLD off: Alarm: LED blinks
HOLD on: Alarm: LED on. HOLD: LED blinks
Alarm
The alarm delay is configurable.
During an error message the alarm LED blinks or lights.
Error messages can also be signaled by a 22 mA output current.
The alarm contact is activated by alarm or power failure,
see also Pg 50.