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Communication Services
4-2
SIMATIC 505 PROFIBUS-FMS CP User Manual
4.1 Overview
The
FMS CP module supports the following types of communication
services:
Fieldbus Message Specification (FMS) services are based on layer 7, the
application layer of the OSI 7 Layer model. FMS services use an
industry-standard, open protocol, which allows for communication
between SIMA
TIC and third-party FMS devices.
Send-Receive services are based on layer 2, the data link layer of the
OSI 7 Layer model, a flexible, lower
-level protocol (using bytes as
opposed to named variables). Because Send-Receive services use layer
2, transmission is limited to a single network segment. Send-Receive
services are supported by the module to allow for communication
between the FMS CP module and Send-Receive devices, such as S5.
S7 services are based on layer 7, the application layer of the
OSI 7 Layer model. S7 services use a proprietary protocol for
communication between SIMATIC S7 devices.
Peerlink II services are based on layer 2, the data link layer of the
OSI 7 Layer model. Because Peerlink II services use layer 2,
transmission is limited to a single network segment. Peerlink II
services are supported by SIMA
TIC 505 only
. Peerlink II offers more
flexibility with greater data handling ability than Peerlink.
These services can all be used concurrently up to the network capacity
.
The FMS CP module can act as a client or as a server when you configure
FMS and Send-Receive services; it can initiate, or respond to, requests for
data. The FMS CP module acts only as a server for S7 services, responding
to remote requests from S7 devices on the network (see T
able 4-1).
T
able 4-1
Service Modes of the FMS CP Module
Service Client Server
FMS Services YES YES
Send-Receive Services YES YES
S7 Services NO YES
Communication
Services
Functional
Modes
of Communication
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