176
6 F 3 B 0 3 6 2
Table A.6 Number of Words that can be Transmitted Using PC Link Protocol with the Ethernet
Port
[When TCP/UDP socket transmission is not used]
Module classification
Processing time for function
Maximum specifiable number of transmission
words for local T2N SEND instructions or remote
PU235N 4 ms (maximum) 485 words (maximum)
5 ms (maximum) 295 words (maximum)
PU245N 3 ms (maximum) 485 words (maximum)
4 ms (maximum) 346 words (maximum)
5 ms (maximum) 131 words (maximum)
Conditions for the above table:
a. For the T2N configuration, this table assumes the configuration of figure A.3, in which T2N
(PU235N/245N) is mounted in the main base unit.
b. Refer to the T2N User's Manual - Hardware for the processing times for the instructions.
c. This table assumes that for PU245N, 128 words is specified for S20LP PC link protocol
transmission (SEND instruction on local port or RECV instruction from remote ports).
However, if S20LP PC link protocol transmission is not used, use the PU235N row in the
above table, even if there are PU245N unit installed.
d. If less than 128 words are used with the S20LP PC link protocol transmission, the number of
words that can be specified during PC link transmission on the Ethernet Port can be increased
over the values listed in table a.6. If the number of words for S20LP PC link protocol
transmission on the PU245N decreased on one word, the number of words for PC link
protocol transmission on the Ethernet Port can increase in one word. However, the maximum
number of words that can be specified during PC link transmission on the Ethernet Port is 485
words.
T2N
(PU235N/
[Example] In case of the transmission with 1024 words in the TMOV instruction is executed.
Execution time required = 206 + 3.5 * n (the number of transmission words : 1024)
= 3790
In this case, the execution time required is under 4ms. Therefore, the maximum specifiable number
of transmission words are 485 words for PU235N, 346 words for PU245N.
[Attention] In case of using the instruction below, be careful to use the maximum specifiable
number of transmission. In the case of using another instruction, be careful, too.
With the computer link and
loader not connected
(main base unit)
Figure A.3 T2N Configuration when Using the PC Link Protocol
TMOV,TNOT,TCMP,XFER,READ,WRITE
