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9 FTP Server
9-4
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
Setting Restrictions
The following restrictions apply to login names and passwords.
•
Only single-byte alphanumeric characters can be used in the login name and password. The login
name and password are case sensitive.
•
A login name consists of up to 12 characters.
•
A password consists of up to 8 characters.
•
Always set a password when you set a new login name. The login name will not be valid unless a
password is set for it.
•
The login name is invalid if the login name is not set or characters other than single-byte alphanu-
meric characters are used.
FTP File Transfer Mode
FTP has two file transfer modes: ASCII mode and binary mode. Before you start to transfer files, use
the
type
command (specifies the data type of transferred files) to select the required mode.
•
To transfer a file in binary format: Select binary mode.
•
To transfer a file in ASCII format: Select ASCII mode.
Multiple Accesses to the Same File
Files accessed with the FTP server may be simultaneously accessed from multiple sources with
communications commands from other FTP servers or programming instructions. Exclusive control
is required to prevent multiple accesses. This is to prevent reading and writing the same file at the
same time. The CPU Unit automatically performs exclusive control as shown below only when the
following combinations of instructions are used. In other cases, use file operation instructions
(Change File Name, Copy File, etc.) or communications commands and perform exclusive control.
•
Exclusive Control When Accessing the Same File on the SD Memory Card
First access
Later access
Instruction
Communications command
Read
Write
Read
Write
Instruction
Read
Exclusive control is automatically
implemented and the read instruc-
tion results in an error (first-come-
first-serve).
(Exclusive con-
trol is not
required.)
Implement
exclusive con-
trol.
Write
Exclusive control is automatically
implemented and the write instruc-
tion results in an error (first come
first serve)
Implement
exclusive con-
trol.
Communica-
tions command
Read
(Exclusive con-
trol is not
required.)
Implement
exclusive con-
trol.
(Exclusive con-
trol is not
required.)
Write
Implement exclusive control.
Содержание SYSMAC CJ1W-EIP21
Страница 8: ...Manual Structure 6 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 10: ...Sections in this Manual 8 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 20: ...Read and Understand this Manual 18 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 42: ...Revision History 40 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 68: ...1 Introduction 1 26 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 80: ...2 Installing Ethernet Networks 2 12 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 130: ...6 Testing Communications 6 4 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 206: ...7 Tag Data Link Functions 7 76 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 246: ...8 Message Communications 8 40 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 266: ...9 FTP Server 9 20 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 374: ...13 Troubleshooting 13 56 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495...
Страница 431: ...Index 1 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495 I Index...
Страница 436: ...Index 6 CJ series EtherNet IP Units Operation Manual for NJ series CPU Unit W495 Index...
Страница 437: ......