Measuring inputs and additional channels
can be exchanged without losing the function channels. However, if the whole
application operates with just one sensor, then programming on the sensor it-
self makes more sense.
On the measuring circuit board this gives the following channel assignment:
8.3 Extending the measuring points
To
extend the measuring points
, up to 9 passive selector switch boards can
be used; however, the total number of measuring channels is limited to maxi-
mum 100.
The
master measuring circuit board
MM-A09 (6) can also drive up to
9 se-
lector switch boards
with 10 inputs each (7j), and these can in turn be
switched by photovoltaic relays. The sensor and channel number of each mod-
ule can be adapted to individual requirements by configuring the measuring
point numbering and thus the channel number of the modules by means of a
code switch (7k). This code switch defines the measuring point number of the
first measuring point of each module and thus also the channel number of the
previous module. This measuring point number must logically be set between
10 and 40 measuring points higher than the previous module and accordingly
the channel number of the previous module will be limited to 10 to 40 measur-
ing points. Multi-channel sensors should therefore be collected as far as possi-
ble in one module. 99 sensors can only be collected in 10 modules if the chan-
nel number of each module is limited to 10, i.e. the measuring point number
goes up by 10 each time. The time taken for a measuring point scan increases
in proportion to the number of measuring channels.
1. With
selector switch board U-A10
(7) the number of measuring points is
extended each time by 10 electrically isolated ALMEMO
®
inputs for all
ALMEMO
®
sensors. In the housing each module occupies 2 plug-in slots.
For the purposes of thermocouple measurement each module is equipped
with 2 cold junction sensors whose value is interpolated for each measuring
point. The measuring time involved will affect the total sampling rate.
2.
Selector switch board U-MU
(8) occupies only 1 plug-in slot but it too has
10 inputs led out to a 64-contact socket strip. The sensors are connected
ALMEMO
®
5690-2M
21
M0 M1 M2 M3 M4
00
10
20
30
03
13
23
33
04
14
24
34
01
11
21
31
02
12
22
32
1. Channel
2. Channel
3. Channel
4. Channel
09
19
29
39
Device internal channels
Difference M01-M00
Sensor channels
05
15
25
35
06
16
26
36
07
17
27
37
08
18
28
38
M5 M6 M7 M8
