Chapter 1
Overview of the MAP Communication
Environment
1-10
Figure 1.10
An Allen-Bradley PLC Controller as an MMS Server
OSI Network
MMS Client
An MMS client requests
resources from the PLC-5
controller.
The OSI interface (the coprocessor
and the modem) makes PLC-5
controller's resources available to the
client.
VMD
Resources
Resources
PLC-5 Controller
I - 12415
Your Coprocessor's OSI Communication Layers
Each of the seven OSI communication layers has its own set of attributes
(characteristics) that in some way control or help to control the
communication process. These attributes include:
parameters
statuses
counters
actions
You can manipulate the values of many of the attributes. Your OSI
coprocessor is shipped with its attributes pre–set to Allen–Bradley default
settings. Some of these settings should not be changed. Refer to
Appendix D of this manual for a complete listing of the OSI coprocessor’s
attributes, including applicable warnings for those you should not change.
The formal description of the MMS options a vendor has implemented
comes in the form of a PICS (Protocol Implementation Conformance
Statement). The PICS for your Allen–Bradley OSI coprocessor is listed in
Appendix C of this manual.
Implementing MMS
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...