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Date: 31/10/12
Page 8File: 700b Technical Manual ver1.9.3.docm
Com -
Output 1-20 +
Load
(relay)
Transducer
Power
Supply
-
-
+
+
Mains
supply
Max 30v @ 150mA
10 Ohms internal
resitance when on
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
Open collector configuration
N.O.
Com
Input 1-20
(Normally open)
+5v
S/W ctrl
pull up
pull down
via shunt
N.C.
Com
Input 1-20
(Normally closed)
+5v
S/W ctrl
pull up
pull down
via shunt