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TS2651N111E78

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TS3103N40

a transmit operation is complete, either the DONE or the ERROR output will be set TRUE to
show the status of the transmit operation. While DONE or ERROR is TRUE, the STATUS
output is valid.
The instruction returns a status of 16#7001 if the communication interface accepts the
transmit data. Subsequent SEND_PTP executions return 16#7002, if the CM or CB is still
busy transmitting. When the transmit operation is complete, the CM or CB returns the status
of the transmit operation as 16#0000 (if no errors occurred). Subsequent executions of
SEND_PTP with REQ low return a status of 16#7000 (not busy).
The following diagrams show the relationship of the output values to REQ. This assumes
that the instruction is called periodically to check for the status of the transmission process.
In the diagram below, it is assumed that the instruction is called every scan (represented by
the STATUS values). 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. New request while transmitter active
80D1 Transmit aborted because of no CTS within wait time
80D2 Transmit aborted because of no DSR from the DCE device
80D3 Transmit aborted because of queue overflow (transmit more than 1024 bytes)
80D5 Reverse bias signal (wire break condition)
833A The DB for the BUFFER parameter does not exist.
Interaction of the LENGTH and BUFFER parameters for SEND_PTP
The minimum size of data that can be transmitted by the SEND_PTP instruction is one byte.
The BUFFER parameter determines the size of the data to be transmitted. You cannot use
the data type Bool or arrays of Bool for the BUFFER parameter. You can always set the LENGTH parameter to 0 and ensure that SEND_PTP sends the
entire data structure represented by the BUFFER parameter. If you only want to send part of
a data structure in the BUFFER parameter, you can set LENGTH as followsThe complete data is sent as defined at the BUFFER parameter. You do not
need to specify the number of transmitted bytes when LENGTH = 0.
Elementary data type The LENGTH value must contain the byte count of this data type. For
example, for a Word value, the LENGTH must be two. For a Dword or Real,
the LENGTH must be four. Otherwise, nothing is transferred and the error
8088H is returned.
Structure The LENGTH value can contain a byte count less than the complete byte
length of the structure, in which case only the first LENGTH bytes of the
structure are sent from the BUFFER. Since the internal byte organization of
a structure cannot always be determined, you might get unexpected results.
In this case, use a LENGTH of 0 to send the complete structure.
Array The LENGTH value must contain a byte count that is less than the complete
byte length of the array and which must be a multiple of the data element
byte count. For example, the LENGTH parameter for an array of Words
must be a multiple of two and for an array of Reals, a multiple of four. When
LENGTH is specified, the number of array elements which are contained in
LENGTH bytes is transferred. If your BUFFER, for example, contains an
array of 15 Dwords (60 total bytes), and you specify a LENGTH of 20, then
the first five Dwords in the array are transferred.
The LENGTH value must be a multiple of the data element byte count.
Otherwise, STATUS = 8088H, ERROR = 1, and no transmission occurs.
> 0
String The LENGTH parameter contains the number of characters to be
transmitted. Only the characters of the String are transmitted. The maximum
and actual length bytes of the String are not transmitted. RCV_PTP checks for messages that have been
received in the CM or CB. If a message is available, it
will be transferred from the CM or CB to the CPU. An
error returns the appropriate STATUS value.When this input is TRUE and a message is available, the message is
transferred from the CM or CB to the BUFFER. When EN_R is FALSE, the CM
or CB is checked for messages and NDR, ERROR and STATUS output are
updated, but the message is not transferred to the BUFFER. (Default value: 0)
PORT IN PORT After you install and configure a CM or CB communication device, the port
identifier appears in the parameter helper drop-list available at the PORT box
connection. The assigned CM or CB port value is the device configuration
property "hardware identifier". The port symbolic name is assigned in the
"System constants" tab of the PLC tag table. (Default value: 0)
BUFFER IN Variant This parameter points to the starting location of the receive buffer. This buffer
should be large enough to receive the maximum length message.
Boolean data or Boolean arrays are not supported. (Default value: 0)
NDR OUT Bool TRUE for one execution when new data is ready and operation is complete
with no errors.
ERROR OUT Bool TRUE for one execution after the operation was completed with an error.
STATUS OUT Word Execution condition code (Default value: 0)
LENGTH OUT UInt Length of the returned message in bytes (Default value: 0)
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.No buffer present
80E0 Message terminated because the receive buffer is full