![background image](http://html1.mh-extra.com/html/omron/cj2h-cpu6-rev-02-2010/cj2h-cpu6-rev-02-2010_operation-manual_740798246.webp)
220
Communicating between OMRON PLCs
Section 8-6
8-6
Communicating between OMRON PLCs
FINS commands can be sent from the CPU Unit of a PLC by using the
SEND(090), RECV(098), and CMND(490) instructions.
SEND(090): Writes I/O data from the local node to another node.
RECV(098): Reads I/O data from another node to the local node.
CMND(490): Issues FINS commands for controlling operations such as send-
ing and receiving I/O memory data to and from other nodes, reading informa-
tion regarding other nodes, and so on.
8-6-1
Communications Specifications
The following table shows the specifications for PLC communications using
the SEND(090), RECV(098), and CMND(490) instructions.
Note
1.
The maximum data length is limited to 512 bytes for data exchange be-
tween the PLC and SYSMAC LINK Systems or the PLC and SYSMAC
BUS/2 Remote I/O Systems.
2.
When broadcasting, do not require a response.
Use the FINS/UDP method for broadcasting.
Item
Specifications
Destination
1:1
SEND(090), RECV(098), CMND(490) instructions
1:N
SEND(090), CMND(490) instructions (broadcasting)
Data length
SEND(090):
990 words (1,980 bytes) max.; broadcasting:
727 words (1,454 bytes)
RECV(098):
990 words (1,980 bytes) max.
CMND(490):
1,990 bytes max.; broadcasting: 1,462 bytes (after FINS com-
mand code)
Data contents
The following data is sent and received with the execution of
each instruction.
SEND(090):
Sends request for remote node to receive data, and receives
response data.
RECV(098):
Sends request for remote node to send data, and receives
response data.
CMND(490):
Sends any FINS command and receives response data.
Communications
port number
Ports 0 to 7 (Eight transmissions can occur simultaneously.)
Response moni-
tor time
0000:
2 s (default)
0001 to FFFF:
0.1 to 6,553.5 s in 0.1-s increments (specified by user)
Number of retries
0 to 15 retries
Summary of Contents for CJ2H-CPU6 - REV 02-2010
Page 2: ......
Page 4: ...iv...
Page 6: ...vi...
Page 14: ...xiv...
Page 18: ...xviii...
Page 38: ...12 Network Configurator Overview Section 1 5...
Page 58: ...32 Selecting the Network Devices Section 2 3...
Page 116: ...90 Auxiliary Area Data Section 4 5...
Page 222: ...196 Message Communications Errors Section 7 6...
Page 364: ...338 Using the Backup Tool Section 13 3...
Page 402: ...376 CS CJ series Ethernet Unit Function Comparison Appendix A...
Page 404: ...378 Ethernet Network Parameters Appendix B...
Page 406: ...380 TCP Status Transitions Appendix C...
Page 452: ...426 Precautions for Using Windows XP Vista or Windows 7 Appendix G...
Page 460: ...434 Index...
Page 462: ...436 Revision History...
Page 463: ......