20
Overview of Communications Functions Section 1-5
1-5-3 FTP Server Function
The Ethernet Unit has a built-in FTP server, so other computers on the Ether-
net can read or write individual files on a Memory Card mounted to the CPU
Unit or in EM File Memory. This allows files to be exchanged between the host
computer and the PLC, with the host computer functioning as an FTP client
and the PLC as an FTP server.
1-5-4 Mail Send Function
This function automatically sends data in the CPU Unit's I/O memory (or a file
on a Memory Card) as an e-mail attachment from the Ethernet Unit to speci-
fied e-mail addresses when a pre-specified PLC condition is met. User-cre-
ated data (in ASCII), error log data, and status data in the CPU Unit can all be
sent as text.
E-mail can be sent over the Internet, and not just within the intranet.
The e-mail can be sent on any of the following types of timing:
When the Mail Send Switch turns ON
When the value of a specified word meets a condition
When the value of a specified bit meets a condition
When an error is recorded in the Ethernet Unit's error log
When the CPU Unit's operating mode is changed
At regular intervals
Note (1) Depending on the Internet service provider (ISP), the use of POP before
SMTP may be defined from the standpoint of security considerations.
(This Unit handles POP before SMTP.)
Ethernet
Ethernet Unit
FTP commands
File data
Host computer to PLC PLC to host computer
CS/CJ-series
CPU Unit
Host computer
(FTP client)
Memory Card or
EM File Memory
Memory Card or
EM File Memory
Memory Card or
EM File Memory
File data
Ethernet
Ethernet Unit
SMTP server
E-mail
CS/CJ-series
CPU Unit
