Preface a - summary of changes, What’s in this preface, 1771-db series a and series b compatibility – Rockwell Automation 1771-DB BASIC MODULE User Manual
Page 3: Summary of changes
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
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
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
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