Chapter 4
Basic Programming Techniques
4-11
MMS is a connection–oriented set of services. To perform any
communication, you must first establish a connection to another device.
This section covers the following topics:
establishing connections with other nodes (OPEN)
terminating connections with other nodes (CLOSE and ABORT)
establishing connections to the OSI coprocessor (on connection zero)
Establishing Connections With Other Nodes (OPEN)
The OPEN command establishes a connection between the OSI
coprocessor and a remote node on the MAP network (figure 4.5). You
must establish a connection before attempting any communication or you
will receive an error code.
Figure 4.5
Establishing a Connection with the OPEN Command
another vendor's MAP device
OSI Network
Allen-Bradley OSI Coprocessor
open :C1 to 'xx`
Programming terminal
with 6200 software
The OPEN command ...
...opens a connection with
a remote node.
I - 12424
You can establish up to 16 concurrent connections (outgoing or incoming)
from a single OSI coprocessor. You can reserve a particular number of
outgoing connections, using the number of outgoing connection reserved
parameter (see Appendix D, MMS Parameters).
Important: You must have an LDIB (Local Directory Information Base)
entry for every remote MAP node to which the OSI coprocessor will open
a connection. Before establishing a connection, you must add the remote
node’s addressing information to the LDIB. You edit/add entries to the
Managing Connections (The
OPEN, CLOSE and ABORT
Commands)
Summary of Contents for PLC-5 MAP/OSI
Page 1: ...PLC 5 MAP OSI Software User Manual Cat No 1785 OSI AB Parts...
Page 4: ...Table of Contents iii OSI Layer Management E 1...
Page 57: ...Chapter 4 Basic Programming Techniques 4 7 For example B7 6 10 AB Parts...
Page 91: ...Mapping MMS Data Types onto PLC 5 40 5 60 File Types Appendix A A 2 T ACC D 16 AB Parts...