VEGA VEGACOM 557 Profibus FMS - Manual (Page 49)

VEGACOM 557 Profibus FMS 49
Supplement
Fig. 5 PROFIBUS-FMS services
Context Management
Initiate
Abort
Reject
OV-Management
Get-OV
Initiate-Put-OV
Put-OV
Terminate-Put-OV
Event Management
Event Notification Event Notification With
Type
Acknowledge Event Notification
After Event Condition Monitoring
Domain Management
Initiate Download Sequence
Download Segment
Terminate Download Se-
quence
Initiate Upload Sequence
Upload Segment
Terminate Upload Sequence
Request Domain Download
Request Domain Upload
Variable Access
Read Read With Type
Write Write With Type
Physical Read
Physical Write
Information Report
Information Report With Type
Define Variable List
Delete Variable List Program-Invocation Management
Create Programinovation
Delete Programinovation
Start, Stop, Resume, Reset, Kill
VFD Support
Status
Unsolicited Status
Identiy
Only the underlined
services must be
supported by all
PROFIBUS instruments.
The selection of further
services is determined
by profiles.
Lower Layer Interface (LLI)
The adaption of layer 7 to layer 2 is realised
by LLI. LLI takes over the flow control and the
connection monitoring as well as the image of
the FMS services on layer 2 by considering
the different instrument types (Master/Slave).
The user communicates with other application
processes via logical channels, the
commu-
nication relationships . For handling of FMS
and FMA7 services, LLI provides different
types of communication relationships. The
communication relationships differ with re-
spect to their connection qualities (monitoring
mechanisms, means of transmission and
requirements on the communication part-
ners). The selection is made according to the
requirements of the application processes.
Figure 6 gives a summary of all possible
communication relationships.
Communication relationship list
All communication relationships of a
PROFIBUS-FMS device must be entered in
the communication relationship list (KBL). The
KBL contains their description. For simple
participants, the list is predefined by the
manifacturer. In all other cases, the KBL is
projected and loaded locally or remotely by
means of the network management services.
From the application process, a communica-
tion relationship is addressed by a local short
designation, the
communication reference
(KR).
From the bus layer, a communication relation-
ship is addressed by the participant ad-
dress, layer 2 service access point and LLI
service access point.
The KBL contains the assignment between
the local communication references, layer 2
and LLI addressing. In addition the communi-
cation context (selection of the services,
telegram lengths …) and the applicable moni-
toring mechanisms are stated specifically for
each KR.
Function overview for PROFIBUS-FMS
1 Object oriented Client-Server model
2 Efficient FMS services (field bus specific
optimisation of the MMS services)
- completion and clearing of logical con-
nections (Context Management)
- reading and writing of variables (Variable
Access)
- loading and reading of storage areas
(Domain Management)
- linking, starting and stopping of pro-
grams (Program Invocation Manage-
ment)
- transfer of event messages with high or
low priority (Event Management)
- status call and instrument indication
(VFD Support)
- services for administration of the object
directory (OV Management)