Communication processor and Modbus TCP
13.6 Legacy PtP communication (CM/CB 1241 only)
S7-1200 Programmable controller
1230 System Manual, V4.2, 09/2016, A5E02486680-AK
The STATUS value is valid when either NDR or ERROR is TRUE. The STATUS value
provides the reason for termination of the receive operation in the CM or CB. This is typically
a positive value, indicating that the receive operation was successful and that the receive
process terminated normally. If the STATUS value is negative (the Most Significant Bit of the
hexadecimal value is set), the receive operation was terminated for an error condition such
as parity, framing, or overrun errors.
Each PtP communication interface can buffer up to a maximum of 1024 bytes. This could be
one large message or several smaller messages. If more than one message is available in
the CM or CB, the RCV_PTP instruction returns the oldest message available. A subsequent
RCV_PTP instruction execution returns the next oldest message available.
Table 13- 109 Condition codes
0094 Message terminated due to received maximum character length
Message terminated because of message timeout
0096 Message terminated because of inter-character timeout
Message terminated because of response timeout
Message terminated because the "N+LEN+M" length condition was satisfied
Message terminated because of end sequence was satisfied
Message terminated because the receive buffer is full
Message terminated due to parity error
Message terminated due to framing error
Message terminated due to overrun error
Message terminated because calculated length exceeds buffer size
Reverse bias signal (wire break condition)
The DB for the BUFFER parameter does not exist.
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