Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 5)

Preface A
Summary of Changes
SOC-3
Error-Trapping Support
The ONERR statement (page 11 -23) traps overflow, underflow, and
divide-by-zero errors in the Series B module. Also, the Series B offers
expanded error (CALL 38, page 12 -36) support for non-hardware errors
undefined in the ONERR statement.
DH-485 Network Support
The Series B module has a DH485 port that you can use as a network port
or a programming port.
See Chapter 2 for more information.
DF1 Protocol Support for Remote Communication
You can configure port PRT2 for DF1 protocol in either full- or
half-duplex mode. With the DF1 protocol you can communicate with
external devices using, for example, a phone line, radio link, or dial-up
modem.
See Chapter 2 for more information.
BASIC Module Operates in 8-Point or 16-Point Mode
The BASIC module can operate in 8-point or 16-point backplane modes.
In 8-point mode, the BASIC module uses 8 bits in both the input and
output image tables for block transfer. In 16-point mode the BASIC
module also allows you to examine bits 10 – 17 for communication port
status.
See Chapters 1 and 5 for more information.
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