Physical Sensor Wiring And Measurements; Digital Input - Normally Open; Digital Input - Normally Closed; Digital Outputs - EDAC Electronics Ltd. EDAC700 RTU Technical Reference Manual

3

Physical Sensor Wiring and Measurements

The EDAC700 RTU has 20 physical input/output (I/O) terminals. The following diagrams
show how the circuits around each of the I/O terminals are configured to perform each of
the six functions.
3.1

Digital Input - Normally Open

Normally open and normally closed inputs have a 0-10V input range.
Normally Open, clean contact, input to Com/Gnd. Triggers below ~1.5V.
3.2 Digital Input – Normally Closed
Normally Closed, clean contact, input at Com/Gnd. Triggers above ~1.5V.
3.3

Digital Outputs

resitance when on
Open collector configuration
Date: 31/10/12
+5v
S/W ctrl
pull up
pull down
via shunt
+5v
S/W ctrl
pull up
pull down
via shunt
10 Ohms internal
Input 1-20
Com
Input 1-20
Com
Output 1-20 +
Max 30v @ 150mA
Com -
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N.O.
(Normally open)
N.C.
(Normally closed)
+
Load
+
(relay)
Transducer
-
Power
Supply
-
Mains
supply