Manual VIPA CPU 21x Chapter 10 Deployment CPU 21xSER-2
HB103E - Rev. 05/45 10-5
The RK512 is an extended form of the 3964(R) procedure. The difference
is that a message header is sent ahead of the message data. The header
contains data about the size, type and length of the message data.
The following paragraph describes the structure of the procedure and
messages:
only 3964R
STX
DLE
Message data
DLE
ETX
BCC
Monitor delayed acknowledgment
DLE
Monitor delayed acknowledgment
STX
DLE
Reaction message
DLE
ETX
BCC
DLE
only 3964R
ctive partne
Passive partner
Monitor delayed acknowledgment
Monitor delayed acknowledgment
The coordination flag is set in the partner PLC in active-mode when a
message is being received. This occurs for input as well as for output
commands. When the coordination flag has been set and a message with
this flag is received, then the respective data is not accepted (or trans-
ferred) and a reject message is sent (error code 32h). In this case the user
has to reset the coordination flag in the partner PLC.
If you want to transfer telegrams without coordination flag, you have to set
FFFFh.
3964(R) with
RK512
Procedure
Coordination flags
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