TAC INET 7793 MCI MicroController Interface.EN.pdf

TAC I/NET TM 7793 MCI

MicroController Interface

The TAC I/NET TM 7793 MicroController Interface provides a

“Gateway” between TAC’s token passing, Peer-to-Peer Controller

LAN and a network of standalone MicroControllers.

TAC I/NET 7793 MCI

MicroController Interface

Features

The MCI also functions as a network

controller for a standalone system.

Description

The 7793 MCI serves a dual role. It can be a

standalone network controller for a system of

MicroControl Units or it can function as a gateway

between a network of MicroControl Units and

other controllers in a larger I/NET Distributed

Control System.

ProduCT AT A GLANCE

• Integration

– Environmental

– Access Control

– General Purpose

An RS-232 port is standard for either a local PC or

a modem. An option board adds a second port

so that a local PC and an Auto Dial/Auto Answer

(AD/AA) modem may operate concurrently. Both

the PC and the AD/AA modem have access to any

point on the Controller LAN or the sub-networks

of MicroControl Units. The MCI supports up to

eight telephone numbers for use with the AD/AA

modem function.

• MicroControl units supported

– 123 Series Microregulators TM

– universal Series Microregulators

– 7910A Series door Processing units (dPu)

– 7920 Series door Processing units (dPu)

– 7930 Series digital Input unit (dIu)

– 7940 Series digital Input output unit (dIo)

• Peer-to-Peer, Token Passing LAN standard

• dual MicroController Sub-LANs

– 32 dPus per MCI

– 64 Mrs per MCI

– 64 MicroControl units per MCI

(dPu and Mr combined)

– Mix and Match Controllers on the Sub-LANs

The MCI provides global functions for the

MicroControl Units. These global functions include:

Access Initiated Control, Elevator Control, Event

Initiated Control, Trending, Runtime Accumulation,

Automatic Time Scheduling, Calculations, Anti-

Passback and periodic synchronization of the local

clocks in the MicroControl Units.

• Counter-Scanning Loop option

• Front End Controller for Standalone System

– Supports up to 64 doors

– Supports up to 64 HVAC Equipment units

Controller Design

The 7793 MCI is based on a monolithic board

design combining processing, memory, and

communications functions on a single printed

circuit board. The controller features removable

terminal blocks, downloadable irmware, optional

on-board modem drivers, three RS-485 ports,

one or two RS-232 ports, and a TTL port for a

Hand Held Console. The inherent reliability of

this monolithic design is further enhanced with

extensive transient protection, automatic self-test

features, and a iber optics communications option.

• remote operation over dial-up Phone Lines

• Fiber optic Compatible

• Local Ports for PC or Modem

• Auto dial/Auto Answer Modem-option Board

• Modular, object-oriented Programming

• Gateway for Global Control Functions

• resident Programs for:

– Access Initiated Control

– Elevator Control

– Environmental Control

– Energy Management

– Historical data Collection

Schneider Electric One High Street, North Andover, MA 01845 USA Telephone: +1 978 975 9600 Fax: +1 978 975 9674 www.schneider-electric.com/buildings

SDS-INET-7793MCI-A4.BU.N.EN.2.2006.0.00.CC

TAC I/NET 7793 MCI

MicroController Interface

Features (continued)

Access Controller Functions

Distributed Access Control downloads all “local”

access control parameters from the Host PC to

the DPU so that it may operate in a standalone

basis. This ensures rapid access processing and

minimal dependence on a single point of failure.

This includes all “Who...Goes Where...When”

parameters. The MCI not only monitors the DPU

but also backs up the database of the DPU for

many parameters. The following functions are

resident in both the MCI and the DPU:

Dimensional Drawing

– Personnel Schedules: 31 time schedules with

a seven-day week, plus seven special days

and two temporary schedules. Each schedule

contains seven intervals with user-deined

begin and end times. One or more Personnel

Schedules are assigned to each door for access

control operation.

– Door parameters: Allows determination of what

reader technology will be used, anti-pass-back

operation, elevator operation, door prop alarm

timers, door strike activation timers, irst key

auto-unlock active, and what activity and alarms

are desired to be forwarded to which Host PCs

for printout, display, or permanent archiving.

– Door mode Schedules: Determines at what

time a door will be under access control, locked,

or unlocked. Each Door Mode Schedule has

a seven-day week, plus special days and

temporary schedules.

on a tenant’s HVAC and lighting upon entering a

building after hours. When using an I/DISCTM

reader as a push button on a control panel and

assigning operators to an I/DISC touch memory

device, Access Initiated Control can initiate a

pre-deined control sequence that records in the

permanent history ile who initiated the sequence

and when it was initiated.

Access Initiated Control causes a user-speciied

point to change state based on access control

related events including: Reader Entry, Reader

Exit, Elevator Entry and Denials of Entry or Exit

for Invalid Schedules, PINs, Anti-Passback, Issue

number, or Floor Selection. Access Initiated

Control Sequences may be assigned to activate

only for speciic tenants, speciic doors, speciic

groups of people, or a designated individual. It

may also be used to create a graphic display

showing who is in the building by name or to turn

The Elevator Control Program supports elevator

cabs with up to 64 loor buttons and up to 31

Personnel Schedules per cab. Upon activating a

reader in the cab during authorized time intervals,

user-deined loor buttons will be active. These

buttons will remain active until a user-deined timer

expires (0-255 seconds) or until any one button is

pressed to prevent “tailgating.”

Schneider Electric One High Street, North Andover, MA 01845 USA Telephone: +1 978 975 9600 Fax: +1 978 975 9674 www.schneider-electric.com/buildings

SDS-INET-7793MCI-A4.BU.N.EN.2.2006.0.00.CC

TAC I/NET 7793 MCI

MicroController Interface

Features (continued)

Environmental Control

Direct Digital Control is provided by “Object

Modules” that are used to develop global logic

sequences. These Object Modules emulate

pneumatic/electronic components and may be

“linked” to create a wide variety of custom control

sequences. Object Modules are available for: PID,

Floating, High/Low Selector, 2-Position, Relay (with

timer), and Reset (dual input).

Model Number

Description

Comments

7793

MicroController Interface

Baseplate Mounted

rS232EXP

Synchronous two-way modem card

(w/o modem)

Plugs on to 7793 base card

CBL072

Cable, Controller dE9 to PC dE9,

6 ft (2 m)

CBL073

Cable, Controller dE9 to PC dB25,

6 ft (2 m)

C B L074

Cable, Controller dE9 to Modem dB25,

6 ft (2 m)

Automatic Temperature Control, working in

conjunction with Automatic Time Scheduling, self

adjusts the heating or cooling providing normal

temperature control as well as setup/set back

control including user-speciied deadbands.

TCoN109

7790 LAN Interface unit

Installation Guide

Hardware platform for MCI

All operator entries on I/NET PCs use menus with self-prompting, ill-in-the-blank editors.

Context sensitive help screens are available with the touch of the “F1” key. There is no

need to learn a custom computer language or generate programming statements.

Predictive Central Plant Start allows plant startup

based on inputs from other optimized start routines

in controllers serving AHUs, heat pumps, VAV

terminals, and other equipment.

Event Initiated Control provides “IF-THEN-ELSE”

control sequences, with time delay options,

based on state changes, value crossings, alarms,

returns to normal, or speciied states of one or

more points.

Demand Limiting continuously monitors the rate

of electrical power consumption and predicts

the demand during each demand interval. If

the predicted demand exceeds a preset level,

controlled loads are shed or setpoints changed

in a user-deined priority sequence. As peak

demand passes and electrical power consumption

decreases, the controller restores the loads

or setpoints to their normal routines. Multiple

power meters are supported in each MCI, with

64 loads speciied for each meter. Maximum Off,

Minimum On-Off, and seven levels of shed priority

ensure eficient Demand Limiting while protecting

environment control objectives.

Downloadable Firmware

Complete executable software is downloaded

through a locally connected PC, LAN, or a modem.

This eliminates the need to visit the controller to

replace EPROMs for enhancements or revisions.

On-line editing Capability

The 7793 MCI provides direct online edit capability

for instant modiication of all parameters. An

operator with the appropriate password

authorization may make changes online that

are as simple as time schedule changes or as

comprehensive as chiller optimization strategies.

There is no need to use archaic techniques that

require compiling, debugging, or reloading the

software. The operator will observe the results of

the changes instantly.

General Functions

Automatic Time Scheduling provides a full year’s

schedule including multiple start/stop times,

special days, and temporary days for each load.

Calculated Points are used to perform special

calculations required by the system. Calculated

points allow development of “equations” using math,

logic, Boolean, time, and other specialized operators.

Schneider Electric One High Street, North Andover, MA 01845 USA Telephone: +1 978 975 9600 Fax: +1 978 975 9674 www.schneider-electric.com/buildings

SDS-INET-7793MCI-A4.BU.N.EN.2.2006.0.00.CC

TAC I/NET 7793 MCI

MicroController Interface

Speciications

7793 MCI

Communication Ports

Controller LAN

RS-485; 19,200 or 9600 baud,

SDLC, token-passing

Door Controller LAN:

RS-485; 9600 baud,

asynchronous, polling

Hand Held Console Port

RJ-11 Modular, 1200 baud, TTL

RS-232 Port

PC @ 9600 baud (7801 tap function)

or Hayes direct-dial asynchronous

modem @ 1200, 2400, or 9600 baud

Rs-232 Expansion Board Port

Supports synchronous modem, direct

or two-way dial, SDLC @ baud rates of

1200 to 9600 baud. Requires optional

plug on module.

Capacity

Channels

2 per MCI

Controllers

– 32 DPUs per MCI

– 64 DIUs per MCI

– 64 DIOs per MCI

– 64 MRs per MCI

– Total of 64 MicroControl Units

per MCI

Station Addresses

One per channel used

Auto Dial Support

Telephone Numbers

8, stored in NOVRAM

Number Of Digits

31 per phone number

Supported

Phone, Beeper, Pager

Physical Description

PCB Dimensions

8.5˝ L x 8.5˝ W x 1.8˝ H

(21.6 cm x 21.6 cm x 4.5 cm)

Baseplate Dimensions

10.0˝ L x 9.6˝ W (25.4 cm x 24.13 cm)

Rs-232 Expansion Board Dimensions

4.3˝ L x 3.4˝ W (10 cm x 8.8 cm)

Weight

2 lbs

Power Requirements

24Vac, +10%, 50/60 Hz (40VA max)

Operating Temperature

32°F to 122°F (0°C to 50°C)

Operating Humidity

10 – 90% RH, non-condensing

Processor

Zilog Z181

Clock/Calendar

Battery-backed, includes seconds,

minutes, hours, day, month,

year, leap year

Network Wiring Requirements

Controller LAN Length

5,000 ft (1500 m) per segment.

25,000 ft (7600 m) with repeaters

Microcontroller Sub-lan Length

5,000 ft (1500 m)

Cable Supported

Twisted pair, shielded

22 AWG(0.324 mm2) or larger,

30 pF/ft or less between conductors,

55 pF/ft or less conductor to shield,

85 to 150 Ohm impedance

Memory

EPROM

32KB

Static RAM

256KBytes

NOVRAM

512Bytes

RAM Battery Backup

On-board Ni-cad, rechargeable.

Maintains RAM for 300 hours

Terminations

Terminal Blocks

Removable screw terminal connectors

Indication

LEDs

LAN port activity (transmitting & receiving),

MicroController Sub-LAN channel activity

(transmitting & receiving – each channel),

Hand Held Console port activity

(transmitting & receiving), RS-232 PC port

activity (transmitting & receiving), operating

status (alarm, reconiguration, low power)

Firmware

Binary Files

Downloadable to battery-backed RAM

All brand names, trademarks and registered trademarks are the property of their respective owners. Information contained within this document is subject to change

without notice.

On October 1st, 2009, TAC became the Buildings Business of its parent company Schneider Electric. This document reflects the visual identity of Schneider Electric,

however there remains references to TAC as a corporate brand in the body copy. As each document is updated, the body copy will be changed to reflect appropriate

corporate brand changes.

Schneider Electric One High Street, North Andover, MA 01845 USA Telephone: +1 978 975 9600 Fax: +1 978 975 9674 www.schneider-electric.com/buildings

February 2006 pdw

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