Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 3)

Preface A
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