Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual User Manual
Page 7
Introduction
Chapter 1
1Ć3
Table 1.B
Related Data Highway Documentation
Publication
Number
(Old/New No.)
Title
1770-810/1770-6.2.1
Data Highway Cable Assembly and Installation Manual
1771-801/1771-6.5.1
Communication Adapter Module (cat. no. 1771-KA)
User's Manual
1771-802---------
Communication Controller Module (cat. no.1771-KC/KD)
User's Manual
1771-811/1771-6.5.8
PLC-2 Family/RS-232C Interface Module (cat.no.
1771-KG) User's Manual
1771/822/1771-6.5.15
Data Highway/RS-232-C Interface Module (cat. no.
1771-KE/KF) User's Manual
1773-801/1773-6.5.2
PLC-4 Communication Interface Module (cat. no.
1773-KA) User's Manual
1774-819/1774-6.5.8
Communication Adapter Module (cat. no. 1774-KA)
User's Manual
6001-800/6001-6.5.1
6001 NET (For VMS) Network Communications Software
User's Manual
6001-802/---------
6001 NET (For RSX-11) Network Communication
Software User's Manual
Terminology
In this manual you will read about the various commands the 1775–KA
module can send and/or receive. To distinguish between commands, we
use some of the following terms:
a protected command can read or write only specified areas of PC data
table. A switch on the PLC, PLC–2 Family, and PLC–4 Controllers
determines if the PC will accept only protected commands from another
PC or an RS–232–C device. When you use a protected command, you
may have a limited area that you can read or write in the other station’s
memory.
an unprotected command can read or write into any area of PC data
table. A switch on the PC that receives the commands determines if the
PLC, PLC–2 Family, and PLC–4 controller will accept unprotected
commands from another PC or an RS–232–C device.
privileged commands are sent by intelligent RS–232–C devices only.
Such devices include computers and intelligent terminals.
Allen–Bradley PC’s do not send privileged commands, but receive and
reply to them. A privileged command can read or write into any area in
the memory of a PC, whether or not switches on the PC have been set
to allow it to receive only protected commands. The term physical