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Attached File Transfer Times Section 3-7
3-7 Attached File Transfer Times
When sending an attached file with the Mail Receive Function, the access
time can be as long as 30 or 40 minutes for a very large file. The following
tables show how long the CPU Unit's memory will be accessed by the Ether-
net Unit (how long the Accessing Memory/Receiving Mail Flag will be ON).
Access Times for CS1 and
CJ1 CPU Units
Access Times for CS1-H
and CJ1-H CPU Units
Note (1) The access times for FileWrite and FileRead commands indicate Memo-
ry Card access times.
(2) The access times in the tables above are standard times when the PLC
Setup's "Fixed Peripheral Servicing Time" setting is set to the default val-
ue of 4% of the cycle time.
(3) The attached file transfer time can be reduced by increasing the time al-
lowed for peripheral servicing in the PLC Setup's "Fixed Peripheral Ser-
vicing Time" setting.
Command Data size CPU Unit's operating mode
PROGRAM RUN
--- 10 ms cycle time
FileWrite 1 KB 0.3 s 1.6 s
10 KB 1.5 s 9.3 s
100 KB 13.7 s 90.4 s
1 MB 160.1 s 1125.4 s
FileRead 1 KB 0.2 s 0.9 s
10 KB 1.0 s 6.3 s
100 KB 9.2 s 65.9 s
1 MB 135.2 s 1132.0 s
IOMWrite 1 word 0.1 s 0.1 s
6,000 words 0.2 s 0.3 s
IOMRead 1 word 0.1 s 0.1 s
6,000 words 0.2 s 0.3 s
Command Data size CPU Unit's operating mode
PROGRAM RUN
--- 10 ms cycle time
FileWrite 1 KB 0.2 s 0.4 s
10 KB 0.9 s 2.6 s
100 KB 9.0 s 25.7 s
1 MB 90.5 s 302.8 s
FileRead 1 KB 0.1 s 0.3 s
10 KB 0.4 s 1.8 s
100 KB 4.0 s 17.8 s
1 MB 48.4 s 272.0 s
IOMWrite 1 word 0.1 s 0.1 s
6,000 words 0.1 s 0.2 s
IOMRead 1 word 0.1 s 0.1 s
6,000 words 0.1 s 0.2 s