
Chapter 1
Overview of the MAP Communication
Environment
1-4
Figure 1.4
The Layers 7 and 1 Are Most Distinct To Your Application
Application
7
Presentation
6
Session
5
Transport
4
Network
3
Data Link
2
Physical
1
Application Program
Layer 7 is where your application program first interacts
with the MAP protocol for transmission onto the network.
Layer 1 is where the message(s) from the program first
make a physical connection to the network media.
OSI Network Media
I - 12409
The Application Layer for the MAP 3.0 Specification contains a unique set
of services called Manufacturing Message Specification (MMS).
Manufacturing Message Specification (MMS) provides services directly
visible to (and used by) the user. MMS specifies a method for
communicating with intelligent plant–floor devices. MMS is not an
application program, it provides services to application programs. These
programs then use the services to communicate with devices on the
network (figure 1.5).
Figure 1.5
MMS is a MAP 3.0 Layer Seven Protocol that Provides Services
Application
7
Application Program
Services
MMS
I - 12410
MMS gives MAP network devices a set of services that they can all access,
allowing them to communicate freely.
The following sections provide a brief overview of MMS. Note that this is
an introduction to the MMS communication environment. For detailed
information, refer to the ISO/IEC 9506 Part 1 (MMS –– Service
Manufacturing Message
Specification
Содержание PLC-5 MAP/OSI
Страница 1: ...PLC 5 MAP OSI Software User Manual Cat No 1785 OSI AB Parts...
Страница 4: ...Table of Contents iii OSI Layer Management E 1...
Страница 57: ...Chapter 4 Basic Programming Techniques 4 7 For example B7 6 10 AB Parts...
Страница 91: ...Mapping MMS Data Types onto PLC 5 40 5 60 File Types Appendix A A 2 T ACC D 16 AB Parts...