The Iso 7-Layer Model - Siemens SINUMERIK 840 Planning Manual

06.91
3.2.4 Possible communication links within the framework
of the ISO 7-layer model
PLC/NC
Layer
7
FMS message
frames
(with System 800
ID)
with AS 512
protocol
without AS 512
*)
protocol
LSV2
3964R
1
1)
The above drawing shows the possible communication links within the framework of the ISO
7-layer model.
The user can select individual layers of the ISO reference model for establishing a
communication link. Additionally, the user can utilize the permanently implemented user,
protocol or procedure layers, individual ISO layers or change these layers for user-specific
definitions.
In column 1), the user is tied to the SINUMERIK 850/880 message frame specification.
Message frames can be used with or without AS 512 protocol. On the procedure level, the
procedures LSV2 and 3964R are available to the user.
Column 2) is independent of the SINUMERIK 850/880 message frame specification; the
AS 512 protocol is however obligatory. The LSV2 or 3964R procedure must be selected just
as in column 1.
In column 3), the user can transfer any message frames, irrespective of the SINUMERIK
850/880 message frame specification and the AS 512 protocol. On the procedure level, the
user can choose among four procedures.
In column 4), the user is, just as in column 3), neither restricted to the SINUMERIK 850/880
message frame specification nor to the AS 512 protocol. The TRANSPARENT procedure
involves no limitations, not even on the procedure level. Message frame transfer is completely
transparent, i.e. the message frames remain unchanged while being passed on.
_______
*) Extended scope of functions: "Flexible communication"
© Siemens AG 1989 All Rights Reserved
SINUMERIK 840/880 (PJ)
3.2.4 Possible communication links within the framework of the ISO 7-layer model
PLC PLC
with AS 512
protocol
LSV2 LSV2, 3964R
RTS-LINE
3964R XON/XOFF
*)
2) 3)
6FC5 197-0AB20-0BP0
3 Interface Modules
PLC
User
layer
Protocol
layer
Procedure
*)
TRANSPARENT
layer
4)
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