Rockwell-automation 1771-DB BASIC MODULE Manual de usuario descargar pdf (Pagina 3)

Preface

SOC-1

Summary of Changes

Read this preface if you are replacing a 1771-DB, Series A module with a

1771-DB, Series B module or are using the BASIC module for the first

time. This preface discusses:

compatibility of the 1771-DB, Series B BASIC module with the

1771-DB, Series A and with the 1746-BAS BASIC modules

changes to this manual since the last printing

The Series B BASIC module is fully compatible with the Series A BASIC

module. You can run the same BASIC program you ran on the Series A on

the Series B module. In addition the Series B has these features.

Series B Features Description See

EEPROM programming

support

two sockets for memory modules: one for EEPROM and the other for EPROM Chapter 3

Additional RAM memory 24K bytes of RAM (an increase from 13K bytes)

Five new troubleshooting LEDs LEDs now indicate when PRT1 and PRT2 are either transmitting or receiving Appendix C

Two fully functional serial ports ports PRT1 and PRT2 can be configured independently for RS-232, RS-422, or RS-485;

on PRT2, you do not need to jumper pins 4 and 5 together to print

Chapter 2

Error–trapping support ONERR statement traps overflow, underflow and divide-by-zero errors

expanded error support for non-hardware errors undefined in the ONERR statement

Page 11–23

CALL 38, page 12–36

DH-485 network support DH-485 port that you can use as a network port or a programming port Chapter 2

DF1 protocol support for

remote communication

configure port PRT2 for DF1 protocol in either full- or half-duplex modes;

with DF1 protocol you can communicate with external devices using a phone line, radio

link, or dial-up modem

Chapter 2

Operate in 8-point or 16-point

modes

in 8-point mode, the module uses 8 bits in both the input and output image tables for

block transfer

in 16-point mode the module also allows you to examine bits 10 – 17 for communication

port status

Chapters 1 and 5

Turbo speed for faster program

execution

the module operates up to four times faster

run the module at the same speed as Series A for slower applications

Reset switch support hard reset switch initiates a full reset

Enhanced serial port

statements and modifiers

enhanced serial port statements (EOF, INPS, INPL) and port statement modifiers (# and

@) aid developing programs for serial communications

Chapter 9

PLC-5



floating point number

support

supports PLC-5 floating point numbers; Series A did not Chapter 8

What’s

in This Preface?

1771-DB Series A and

Series B Compatibility

1 2 3 4 5 6 7 8 ... 393 394

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