Communicating Between Omron Plcs; Communications Specifications - Omron SYSMAC CJ1W-EIP21 Operation Manual

Communicating between OMRON PLCs

8-6

Communicating between OMRON PLCs

8-6-1

Communications Specifications

Note
220
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.
The following table shows the specifications for PLC communications using
the SEND(090), RECV(098), and CMND(490) instructions.
Item
Destination 1:1
1:N
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 Ports 0 to 7 (Eight transmissions can occur simultaneously.)
port number
Response moni- 0000:
tor time 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
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.
Specifications
SEND(090), RECV(098), CMND(490) instructions
SEND(090), CMND(490) instructions (broadcasting)
Section 8-6