8 BUILT-IN ETHERNET FUNCTION INSTRUCTIONS
8.2 Socket Communications Function Instructions
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• When the SP.SOCRCV instruction is executed, reading data from the socket communication receive data
area is executed with the END processing. Thus, executing the SP.SOCRCV instruction extends the scan
time.
• When the data of odd-number of bytes is received, invalid data is stored in the higher byte of the device
where the last receive data is stored.
In the END processing after the execution of the SP.SOCRCV instruction, the receive data of the connection specified by (s1)
is read from the socket communication receive data area.
The completion of the SP.SOCRCV instruction can be checked using the completion devices (d2)+0 and (d2)+1.
• Completion device (d2)+0: Turns ON during the END processing for the scan in which the SP.SOCRCV instruction is
completed, and turns OFF during the next END processing.
• Completion device (d2)+1: Turns ON or OFF depending on the status when the SP.SOCRCV instruction is completed.
The following figure shows the timing of the receive processing with the SP.SOCRCV instruction.
For details, refer to  Built-in Ethernet communication manual.
Status Description
When completed normally The device does not change (remains OFF).
When completed with an error The device turns ON during the END processing for the scan in which the SP.SOCRCV instruction is completed, and turns
OFF during the next END processing.
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