Communication processor and Modbus TCP
13.6 Legacy PtP communication (CM/CB 1241 only)
S7-1200 Programmable controller
1228 System Manual, V4.2, 09/2016, A5E02486680-AK
The following diagram shows how the DONE and STATUS parameters are valid for only one
scan if the REQ line is pulsed (for one scan) to initiate the transmit operation.
The following diagram shows the relationship of DONE, ERROR and STATUS parameters
when there is an error.
The DONE, ERROR and STATUS values are only valid until SEND_PTP executes again
with the same instance DB.
Table 13- 106 Condition codes
New request while transmitter active
Transmit aborted because of no CTS within wait time
Transmit aborted because of no DSR from the DCE device
Transmit aborted because of queue overflow (transmit more than 1024 bytes)
Reverse bias signal (wire break condition)
The DB for the BUFFER parameter does not exist.
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