VersaTRAK RTU User M anual
Page 12 of 31
Last Revised: 05/23/02
SIXNET
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Mini-VersaTRAK
Discrete Inputs
The Mini-VersaTRAK RTU has four on-board discrete input channels that accept DC signals
from 10 to 30 volts
DC Input Wiring
One wire from each of the four input signals is connected to a single common terminal. Up to
four signals may be connected to the Mini-VersaTRAK RTU in sourcing or sinking
configurations. Refer to the diagram below for sample wiring connections.
Discrete Input
Group Isolation
The four discrete inputs are optically isolated (in groups of four) from each other and from the
Mini-VersaTRAK circuitry and expansion I/O modules.
Sinking or
Sourcing Wiring
DC inputs are typically wired in a sourcing configuration as shown in the upcoming
diagram. Mini-VersaTRAK DC input channels will read either DC sinking or sourcing
wiring. To configure sinking DC wiring, connect the positive power input to the COM
terminal for the four channels.
Counter
Feature
All four discrete input channels have an input count accumulator feature. If this feature is
enabled (in the SIXNET I/O Tool Kit), an analog input register will report a unipolar
(unsigned) 16-bit count value that increments on each OFF to ON transition of the
corresponding input. The maximum count input rate is 100 Hz (6000 pulses/min). These
accumulations initialize at zero each time power is cycled. They cannot be reset under
software control.
Mini-VersaTRAK On-board Discrete Input Connections
