Panasonic FP2 ET-LAN Technical Manual page 291

Transparent communication
The following is a guide to the transmission time when the ET-LAN unit is sending or receiving data.
When using TCP/IP:
Transmission processing time = 0.017 x no. of transmission data bytes + 8 (ms)
Receive processing time = 0.005 x no. of receive data bytes + 8 (ms)
When using UDP/IP:
Transmission processing time = 0.017 x no. of transmission data bytes + 6 (ms)
Receive processing time = 0.005 x no. of receive data bytes + 6 (ms)
The above calculation formula is used with both the FP2 CPU and the FP2SH CPU.
[Example]
When using transparent communication to send 1,000 bytes of data:
Transmission processing time = 0.017 x 1,000 bytes + 8 (ms) = 25 (ms)
Note:
The transmission processing time of MEWTOCOL communication and transparent communication gets
longer with the e-mail function to perform communication processing by automatically generating
MEWTOCOL in order to get the status of the CPU unit within the ET-LAN unit. Referring to the following,
calculate the transmission processing time.
When using the FP2 CPU:
Transmission processing time = Minimum transmission delay time without using the e-mail function
+ 10 + 0.0025 x no. of automatically-generated MEWTOCOL bytes (ms)
When using the FP2SH CPU:
Transmission processing time = Minimum transmission delay time without using the e-mail function+ 6 +
0.0035 x no. of automatically-generated MEWTOCOL bytes (ms)
The automatically-generated MEWTOCOL is 18 bytes at minimum, and it increases according to the
type or number of the obtained device.
Reference: For the details of MEWTOCOL, see <14.1 MEWTOCOL-COM (Computer Link)>.
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