Burkert Type 8620 - Manual (Page 142)

mxCONTROL Type 8620
Page 142
15 Alarm and Error Messages
15.1 Alarm function
This function actuates the common alarm output whenever a controlled variable exceeds adjustable
upper and lower alarm limits or the datalogging failed.
If an alarm occurs in at least one of the processes (see Figure 10), this is indicated by the yellow
flashing LED on the A/M-Key
.
Note! If a switching hysteresis is present, the triggering of the alarm is impacted by the value
definition (e.g.: Switching takes place above and below the alarm set point to prevent excessive
switching frequency - compare Figure 75).
Warning limits can be additionally set for displaying and logging purposes only.
Figure 75:
Alarm/warning -
switching hysteresis
Adjustable alarm parameters:
Analog inputs Digital inputs Oxygen
4-20mA, Pt100 Frequency Binary
Module O2_SCAV
_CTRL_RATIO
High alarm limit Alarm+ X X - X
Low alarm limit Alarm- X X - X
Switching alarm hysteresis AHyst X X - X
Low or High Alarm with delay - - X -
For displaying and logging purposes only:
High warning limit Warn+
X X - X
Low warning limit Warn- X X - X
Switching warning hysteresis WarnHys X X - X