Chapter 5 - Digital Input Unit; General; Di Card - Veesta World V-RTU2000 Series Technical Information

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Table of Contents

V-RTU2000 Series

Veesta - Remote Terminal Unit

Technical Specification Manual

Chapter 5 -

5.1

General

5.2

DI Card

Digital Input Unit

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.

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".