Panasonic FP2 ET-LAN Technical Manual page 56

TCP ULP (packet existence duration) and TCP re-transmission timer value settings
When TCP/IP communication is being carried out, data is automatically re-sent the specified number of
times, as shown in the illustration below.
Example: (when default settings are used)
20AH: TCP ULP = 000FH/30 seconds
20CH: TCP re-send timer value = 0005H/10 seconds
Note:
If the value set for the TCP ULP is smaller than that set for the TCP re-send timer, the data will not be
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re-sent. Data will only be sent the first time.
If UDP/IP is being used, re-sending is not carried out.
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Key Point:
Always specify the source node IP address and the source node MEWTOCOL station number. If these
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are not specified correctly, an error will occur processing will be terminated, and the "E1" Error LED will
light.
If the default values are to be used for other timer values, no values need to be written.
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