Ahlborn ALMEMO 710 Operating Instructions Manual page 57

13.2.13.4 Reference channel 1
The calculating functions of the function channels usually refer to one (or two)
particular measuring channel(s). (see 13.2.13.1, Manual 6.3.4)
When programming a function channel the 1st channel Mx.0 on sensor plug
Mx.x is set automatically as reference channel Mb1. The 2nd reference chan-
nel Mb2 (for differential value, average value M(n), etc.) is provided initially by
measuring channel M0.0. However, in the function ´Reference channel 1´ it is
also possible, via a selection box, to set any other suitable measuring channel
as reference channel.

These reference channels are entered in the new V7 channel num-
bering system but saved, wherever possible, in V5 format; this per-
mits operation on both old and new devices alike.
13.2.13.5 Reference channel 2 or multiplexer
With those function channels needing a 2nd reference channel (see above)
´Reference channel 1´ is followed automatically in the next line by the function
´Reference channel 2´ where an appropriate setting can be entered.
In all other cases in the function ´Multiplexer´ it is possible, via a selection box,
to change the input multiplexer and thus also the pin assignment in the con-
nector. (see Manual 6.10.2).
Multiplexer
Measuring inputs B+ and A-, with respect to ground
Measuring inputs C+ and A-, with respect to ground
Measuring inputs D+ and A-, with respect to ground
Differential measuring inputs C+ and B-
Differential measuring inputs D+ and B-
13.2.13.6 Element flags
For certain quantities so-called element flags that help implement sensor-spe-
cific additional functions are activated or can be activated. (see Manual 6.10.3)
Measuring current 1/10 for Pt1000, Ni1000, 5000
(Flag 2:) *
Bridge switch for final value simulation, can be activated
Scan - only in cycle for sensors / ranges with cyclic calculations
Electrical isolation - disable if differential inputs have no ground (see 8.5)
(Flag 6:) *
Sensor breakage detection - disable for high-impedance sources
Analog output 4 to 20 mA instead of 0 to 20 mA
* With the ALMEMO
13.2.13.7 Minimum sensor supply voltage
Normally, for each ALMEMO
specified; it needs this to operate properly. If the actual sensor supply voltage
drops below this value the measured value will be treated as a sensor break -
® 710 this element flag has no significance.
® sensor, a ´Minimum sensor supply voltage´ is
Ω
instead of Pt100, Ni100, 500 : I 1/10
ALMEMO
Channel functions
B - A
C - A
D - A
C - B
D - B
Ω
IR
Bridge
Cyclic
Iso Off
Flag 6
Br Off
A 4-20
® 710 57