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8-2
8.1 An Overview of the Data Transfer Function
8.1.1 What is the Data Transfer Function?
With the data transfer function in the ET-LAN unit, program instructions (the SEND and RECV
instructions) in the programmable controller are used to transfer data. Data can be transferred between
the units indicated below.
- Between open PLC and another
- Between a PLC and computer
The maximum amount of data that can be transferred with a single data transfer instructions is 1020
words.
SEND instruction
Writes data to the I/O or register of the partner node
RECV instruction
Reads data from the I/O or register of the partner node
Note:
When using the data transfer function, TCP/IP should be used in order to assure the reliability of the
communication.
Key Point:
-
With data transfer, the programmable controller specifies an IP address and a MEWTOCOL station
number (1 to 64), and opens a connection with the computer (partner node) in the MEWTOCOL
communication mode.
-
After the connection has been opened, the communication destination is specified only by the
MEWTOCOL station number (1 to 64) in the ladder program on the programmable controller side.
-
Data transfer enables up to eight simultaneous connections, in conjunction with other communication
functions, using a single ET-LAN unit.
-
There is no need to notate a program to handle communication, after the connection has been opened,
for the programmable controller on the side that receives the data transfer command.
-
The computer link function and data transmission function can be run on the same connection at the
same time.
Summary of Contents for FP2 ET-LAN
Page 11: ...Chapter 1 Unit Functions and Restrictions ...
Page 14: ...1 4 1 1 4 Connecting to a Network AFP2790 100BASE TX 10BASE T 10BASE5 AUI AFP27901 ...
Page 24: ...1 14 ...
Page 25: ...Chapter 2 Names and Functions of Parts ...
Page 29: ...Chapter 3 Connection for LAN Cable ...
Page 37: ...Chapter 4 Confirming the Design Contents ...
Page 49: ...Chapter 5 Initialization Processing and Termination Processing ...
Page 68: ...5 20 ...
Page 69: ...Chapter 6 Open Processing and Close Processing ...
Page 84: ...6 16 ...
Page 85: ...Chapter 7 Computer Link Function ...
Page 94: ...7 10 Program example ...
Page 97: ...7 13 Example of communication data Same hierarchy communication ...
Page 100: ...7 16 Example of communication data Other hierarchy communication ...
Page 101: ...7 17 Other hierarchy communication for MEWTOCOL COM ...
Page 102: ...7 18 ...
Page 103: ...Chapter 8 Data Transfer Function ...
Page 111: ...8 9 Program example ...
Page 114: ...8 12 Example of communication data Same hierarchy communication ...
Page 117: ...8 15 Example of communication data Other hierarchy communication ...
Page 119: ...8 17 Other hierarchy communication for MEWTOCOL DAT ...
Page 120: ...8 18 ...
Page 121: ...Chapter 9 Transparent Communication Function ...
Page 137: ...9 17 Program example ...
Page 143: ...Chapter 10 Auto Connection ...
Page 155: ...10 13 Case 1 Ladder program example ...
Page 169: ...Chapter 11 E mail Function ...
Page 200: ...11 32 ...
Page 201: ...Chapter 12 Error Log Function ...
Page 203: ...12 3 Latest log block area Log block reading processing area ...
Page 219: ...Chapter 13 Troubleshooting ...
Page 224: ...13 6 13 2 4 Troubleshooting Flowchart ...
Page 225: ...13 7 ...
Page 229: ...Chapter 14 MEWTOCOL Communication Procedure ...
Page 242: ...14 14 To write to an index register ...
Page 262: ...14 34 ...
Page 263: ...Chapter 15 Specifications ...
Page 292: ...15 30 15 6 ASCII Codes ...
Page 293: ...15 31 15 7 Dimensions AFP2790 FP2 ET1 AFP27901 FP2 ET2 ...
Page 294: ......
Page 295: ...Chapter 16 Sample Program ...
Page 298: ...16 4 ...
Page 299: ...16 5 ...
Page 300: ...16 6 ...
Page 301: ...16 7 ...
Page 304: ......
Page 305: ......