Message Frames - Siemens SINUMERIK 840 Planning Manual

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Message Frames

Message frames are data blocks which are exchanged between the nodes. The message
frame structure is shown in figure "Protocols for computer link".
Procedure start Protocol header
SINEC H1
(Bus connection)
20 bytes 2 bytes
AS 512 header
3964R/LSV2
(Serial connection)
10 bytes 2 bytes
XON/XOFF,
RTS-LINE,
TRANSPARENT
(Serial connection)
Protocols for computer link
A message frame consists of the procedure start and procedure termination, the protocol
header and the message frame data.
With the bus connection, the procedure start and termination of the SINEC H1 procedure are
used as well as the AP 1.0 header as protocol header. If connection is via serial interfaces,
either the 3964R, LSV2, XON/XOFF, RTS-LINE or TRANSPARENT procedure can be used.
The protocol header of the serial connection is identical with that of the AS512 header of the
S5 control.
For a more detailed description of the procedures and protocols, please refer to Section 3,
Interface Modules.
Message frame data
The message frame data is described in greater detail below.
In the case of a bus connection, message frames have the following structure:
• Identification
• Error number
• Useful data
_______
1) configurable in interface list
with/without AS 512 protocol
with/without System 800 identification
2) max. 244 bytes, when connected to SIEMENS FMS SYSTEM max. 224 bytes
© Siemens AG 1989 All Rights Reserved
SINUMERIK 840/880 (PJ)
Message frame data
AP 1 header Identification
Message
frame length
8 bytes 2 bytes
1) Identification
Message
frame length
8 bytes 2 bytes
(max. 244 bytes)
6FC5 197-0AB20-0BP0
6 Message Frames
Proc. termination
Error Useful SINEC H1
number data (Bus connection)
2)
1)
Error Useful 3964R/LSV2
number data (Serial connection)
2)
XON/XOFF,
Useful data RTS-LINE,
TRANSPARENT
(Serial connection)
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