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itself makes more sense.
On the measuring circuit board this gives the following channel assignment:
7.3 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 (2) can also drive up to 9 se-
lector switch boards with 10 inputs each, and these can in turn be switched
by photovoltaic relays. The sensor and channel number of each module 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 (3j). This code switch defines the measuring point number of the first
measuring point of each module and thus also the channel number of the pre-
vious 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 measuring
points. Multi-channel sensors should therefore be collected as far as possible
in one module. 100 sensors can only be collected in 10 modules if the channel
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 boards U-A10 (3) 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 measur-
ing point. The measuring time involved will affect the total sampling rate.
2. The selector switch board U-MU (4) occupies only 1 plug-in slot but it too
has 10 inputs led out to a 64-contact socket strip. The sensors are con-
nected via a 10-fold connector (ZA 5690-MU) each with four screw termi-
7. Connecting the transducers
17
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