ADS Environmental Services Spider QR 775010 A0 - Manual (Page 13)

ADS Environmental Services ADS Spider User Manual
Page 11
Inputs
The ADS Spider accepts two different types of inputs
–
native and
intelligent.
Native inputs allow simple switch, voltage, and current sensors to be
connected directly into the Spider.
Intelligent inputs are available as an option and are used to interface
to intelligent sensors. Currently, the Spider supports SDI-12 intelligent
sensors. Other intelligent sensor types will be supported in later
versions.
Native Inputs
Native inputs are connected to the Spider via two multi-pole
connectors. Each multi-pole connector accepts four inputs. They are
labeled INPUT1 through INPUT8, and each is provided with two
screw terminals. Wire sizes up to AWG 16 may be used. Each input
can be configured by the user for operating in one of the following five
modes:
1.
“
SWITCH
” –
switch closure or voltage-free contact.
Switch inputs detect either an active (ON) state or an inactive
(OFF) state. The active state is indicated by shorting the two
terminals together, while the inactive state is indicated by the
terminals that remain open. A switch state must be stable for
a minimum of 5 seconds to be recognized.
NOTE: There is no galvanic isolation between different inputs
or the Spider internal circuitry.
2.
“
ANALOG
”
Analog inputs are used to monitor industrial sensors, such as
voltage, current, temperature, and pressure sensors.
Most common sensor types are supported, including:
0
–
20 mA sensors
4 - 20 mA sensors