Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 334)

Product Overview

Appendix

A –2

Hardware Features

Hardware element Description

Reset switch

When you press this switch (located behind the module ejector tab), the

BASIC module initiates a full reset. The BASIC module reacts to this

reset the same as it does when you turn on power to your I/O chassis

backplane.

LED indicators 10 LED indicators for module diagnostics and operator indicators.

• 8 pre-defined LED indicators

• 2 user-defined LED indicators

DH485 port This RJ-45 port (DH485) provides communication over the DH-485

network.

Use DH485 port to interface the BASIC module with the DH-485 network.

This port is not isolated and cannot directly drive the DH-485 network.

You must use a 1747-AIC link coupler to link port DH485 with the DH-485

network. You can also use this port as a program port.

PRT2 port This independently configurable, isolated 25-pin D-shell serial port

provides RS-232, RS-422, and RS-485 communication with I/O devices.

Use PRT2 to interface the BASIC module with user devices or a modem

using DF1 protocol. PRT2 provides DF1 full–duplex or half–duplex slave

protocol for SCADA applications. PRT2 is capable of operating full–duplex

at 300, 600, 1200, 2400, 4800, 9600, and 19200 bit/s. It is electrically

isolated to 500V dc.

PRT1 port This independently configurable, isolated 25-pin D-shell serial port

provides RS-232, RS-422, and RS-485 communication with I/O devices.

Use PRT1 to interface the BASIC module with user devices. PRT1 is

capable of operating full–duplex at 300, 600, 1200, 2400, 4800, 9600, and

19200 bit/s. It is electrically isolated to 500V dc. You can also use this

port as a program port.

RAM 24K bytes of battery backed RAM for storage of user programs and data

Battery backup

• battery-backed, 24-hour clock/calendar

• capacitive backup of RAM during battery change

Memory module

• socket for a standard EEPROM or pre-programmed EPROM memory

module with a carrier

• socket for standard EEPROM or pre-programmed EPROM memory

module without a carrier

• on-board EEPROM programming

User-accessible

free-running clock

5 ms resolution

User-accessible

wall clock/calendar

1 s resolution

Backplane interface

• 1771 I/O

• supports block-transfers

• multiple BASIC modules can reside in the same I/O rack and function

independently of each other

DH485

PRT2

PRT1

LED

Indicators

Reset

1 2 ... 329 330 331 332 333 334 335 336 337 338 339 ... 393 394

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