V-RTU2000 Series
Chapter 5 - Digital Input Unit
Veesta - Remote Terminal Unit
Technical Specification Manual
Page 42 of 90
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Chapter 5 -
Digital Input Unit
5.1
General
In hardware, digital input (DI) Card provided with 8 DI Points
(CH1~CH8), 1 Common Point (COM) and 1 Framing Ground (FG).
The different card types provided by V-RTU2000 Series are as listed
below:
DI Card (DC 24/48V)
: Digital Input Card, 8 Points / Card, DC
24/48V Sense Voltage.
DI Card (DC 129V)
: Digital Input Card, 8 Points /Card, DC 129 V
Sense Voltage.
ACC Card (DC 24V)
: Digital Input Accumulator Pulse Counter
Card, 8 Points / Card, DC 24V Sense Voltage.
ACC Card (DC 129V)
: Digital Input Accumulator Pulse Counter
Card, 8 Points / Card, DC 129V Sense Voltage.
In practical, DI Card may be defined as:
MCD (Momentary Change Detection) Simple Status
SOE (Sequence of Event)
ACC Pulse Accumulator
No matter the DI or ACC the De-bounce Time is software
programmable from 1ms to 250ms of 1ms as a step. The following
explanation does not set DI or ACC, certainly, it just discusses the
hardware.
5.2
DI Card
Digital Input Card is an intelligent IO Card, which is used to detect
the status of the field equipment, such as the status of CB/Relay and
the minor/major alarm of transformer, etc. Basic structure is CPU
come with its Firmware; also provide the interface circuit, for some
input status requirement. It connects with CPU Card under through
LIOC RS-485 communication interface, the DATA & /DATA
Communication Signal is directly linked by the backplane without
additional wirings. The external connection contains 8 Digital Input
Points (CH1~CH8), 1 Common Point (COM) and 1 Framing Ground
(FG), which are transmitted through 96-Pin DIN Connector to 10-Pin
terminal on the backplane for actual application. In design, the input
is acceptable for bipolar signal and the common point can be either
“plus” or “minus”.
