Channel Locking; Limit Values - Ahlborn ALMEMO 710 Operating Instructions Manual

13. Settings
Output function
Measured value (Mxx)
Differential (Mxx-M00)
Maximum value (Mxx)
Minimum value (Mxx)
Average value (Mxx)
Alarm value (Mxx)

13.2.6 Channel locking

The function parameters of each measuring channel are protected by means
of a settable ´Locking level´. (see Manual 6.3.12)
Before programming can take place locking must first be lowered to an appro-
priate level. If the display shows a dot after the locking level, this means that
modification is not permitted.
Locking
0
1
3
4
5
6
7
In menu ´Channel parameters´ each function is shown with the locking level at
which it will in fact be locked, i.e. not be programmable. Given the inconve-
nience of having to lower the locking level each time before programming and
the risk of forgetting to restore locking to its correct level afterwards, this device
will open a check-box, which indicates that locking is in force but - subject to
deliberate confirmation - will still permit programming to be performed.

13.2.7 Limit values

Two limit values, ´Limit value maximum´ and ´Limit value minimum´, can be
programmed for each measuring channel. Overshooting / undershooting a limit
value (like exceeding a measuring range limit and sensor breakage) is treated
as a fault; the red alarm LED lights up and the built-in beeper sounds. In the
display the measured value is highlighted - in red if MAX is overshot or in blue if
MIN is undershot - and the appropriate alarm relay (connected via relay cable) is
triggered (see 13.5.2). Since the maximum and minimum values are displayed
in a different color, it is also possible - on completion of a measuring operation -
to see whether a limit value has been infringed. All limit values can also have
relays assigned to them separately (see 13.2.8). The alarm status will remain in
effect until the measured value returns to within the prescribed limit values by
the amount set as hysteresis. ´Hysteresis´ is set by default to 10 digits for all
50 ALMEMO
Status symbol
Locked functions
None
Measuring range + element flags + output mode
+ units
+ zero-point correction and gain correction
+ base value, factor, exponential
+ analog output, start / end, zero-point adjustment. temporary
+ limit values, maximum and minimum
® 710
Abbrev. in ALMEMO-Control
Mess
Diff
Max
Min
M(t)
Alrm