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CHAPTER 7 GMWIN FUNCTION BLOCK
7.3.5 UDP_RCV
station using TCP/IP
GMR GM1/2 GM3
Product
Used to receive data sent from the destination
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Applicability
Function Block
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GM4
GM6
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GM7
Description
Input
REQ: When it is at rising edge (0→1), the Function Block
is executed.
NET_NO: The slot number (0 to 7), in which the
communication module of the local station is
installed,
and
where
the
Function
Block
is
transferred.
CH_NO: Channel edited in E_CONN Function Block.
FRAME: Frame to be received (distinguished with
capital/small letters).
It must be downloaded in the FEnet module after
editing in Frame Editor.
ARR_CNT: The number of data to be received. Number
of data type equivalent to ‘DATA.
DATA: An area saving RX data. Uses ‘ARRAY’.
Output
NDR: It turns ‘ON’ during normal service.
ERR: It turns ‘ON’ during an error occurrence after the
Function Block is executed.
STATUS: It is a detailed code value of an error.
SIP_ADDR: IP address of the station that sent data.
S_PORT: Port of the station that sent data.
RCV-LEN: A number of received data.
This Function Block is used to receive data of the destination station using UDP/IP. UDP/IP
communication does not establish a channel, so it can receive any data that has sent from station to
an open port. Therefore, it is possible in UDP_RCV Function Block, different from TCV_RCV, to
know which station (SIP_ADDR) sends data to which port number (S_PORT). The operation of this
Function Block is the same with TCP_RCV. However, the TCP_RCV Function Block displays the
information of the destination station in the output. Except this difference, every operation is the
same with each other, it is also identical for both to use the frame name such as ‘_UDATA_RCV’
without a special specification of RX data form. Therefore, this Function Block’s operation saves the
received data in the specified variable in ‘DATA’ when the received data from the established station
is identical to the frame defined as ‘FRAME’. (It should be defined as an appropriate name in ‘Frame
Editor’, and downloaded in the FEnet module.)
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