Table of Contents
Advertisement
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:
30
31
4. Channel
3. Channel
20
21
2. Channel
10
11
1. Channel
00
01
M0 M1 M2 M3 M4
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
®
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
Measuring inputs and additional channels
Sensor channels
32
33
34
35
22
23
24
25
12
13
14
15
02
03
04
05
M5 M6 M7 M8
Device internal channels
36
37
38
39
26
27
28
29
16
17
18
19
06
07
08
09
ALMEMO
Difference M01-M00
®
inputs for all
®
5690-2M
21
Advertisement
Table of Contents
