VersaTRAK RTU User M anual
Page 11 of 31
Last Revised: 05/23/02
SIXNET
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FAX +1 (518) 877-8346
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VersaTRAK
Discrete Inputs
The VersaTRAK RTU has eight on-board discrete input channels that accept DC signals
from 10 to 30 volts.
DC Input Wiring
There are two groups of four discrete input channels. Within each group, one wire from each
of the four input signals is connected to a single common terminal. Up to eight signals may
be connected to the VersaTRAK RTU in sourcing or sinking configurations. Refer to the
diagram below for sample wiring connections.
Discrete Input
Group Isolation
The eight discrete inputs are optically isolated (in groups of four) from each other and from
the 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. 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
group of four channels.
Counter
Feature
All eight 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.
VersaTRAK On-board Discrete Input Connections
