ELPRO 905U - Page 22

905U Wireless I/O Module User Manual
105S Serial I/O Module
Page 22 © January 2011
DEVICE
_
Note:
COM on 905U is
connected to
ground/earth. If
the external power
supply cannot be
grounded, a loop
isolator
must be
used.
+
Connecting to a floating input device, powered from the 905U
+24V
AO 1
COM
905U
+V
-V
DEVICE
+
+24V
AO 1
COM
905U
_
Connecting to an externally powered floating-input device
+V
DEVICE
AI
+24V
AO 1
COM
905U
Signal
Isolator
Connecting to a grounded input device via a signal isolator