8. Connecting sensors / transducers
ring inputs themselves (between B, C, D, and A) must not exceed 12 V.
However, some components are not electrically isolated
, namely all sen-
sors connected to the common internal power supply ±U and sensors combi-
ned within one connector. This also includes all D7 sensors; each such sensor
(in particular electrical measuring connectors) must therefore be used with a
small adapter cable ZA D700-GT; this provides electrical isolation for the pow-
er supply and data lines. Such problems do not affect sensors without a con-
ductive connection. Non-insulated sensors can be sufficiently protected by
electrically isolating the power supply (battery, mains adapter, or connecting
cable with DC/DC converter).
Data and trigger cables are also insulated by means of optocouplers.
20 ALMEMO
®
809
M0
M1
M2
Datenkabel
AC
DC
DC
DC
ADC
uC
U-
U+
V5-Fühler
Versorgung
10..30V=
230V≈
Galv. getrennt
S
DC
DC
A
B
M3
D7-Fühler
Galv. getrennt
ZAD700-GT
