Omron CJ1W-FLN22, Operation Manual, Page: 120 / 277

Sending Commands from a PLC Section 7-2
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7-2 Sending Commands from a PLC
FINS commands can be sent from the user’s ladder-diagram program in the
CPU Unit 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): Sends 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.
7-2-1 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 request a response.
3. Broadcasting cannot be used with the SEND(090)/RECV(098) instruc-
tions.
4. If multiple communications ports are used to execute multiple communica-
tions instructions (SEND(090), RECV(098), and CMND(490)), an error re-
sponse will be received by the FL-net Unit (error code 0x2605: Servicing
in progress). Execute communications instructions for FL-net one at a time
from a single communications port.
PLC Communications
Data Areas The following table shows the I/O data areas involved when SEND(090) and
RECV(098) are used.
Item Specifications
Destination 1:1: SEND(090), RECV(098), CMND(490) instructions
1:N: SEND(090), CMND(490) instructions (broadcasting)
Data length Addressed to an FL-net node (Ver. 2.00) on the same layer
SEND(090): 512 words (1,024 bytes) max.
RECV(098): 512 words (1,024 bytes) max.
CMND(490): 1,014 bytes max. (after the FINS command code), including broadcasting
(after FINS command code)
Addressed to an FL-net node (Ver. 2.00) on another layer (2nd or 3rd layer)
SEND(090): 503 words (1,006 bytes) max.
RECV(098): 505 words (1,010 bytes) max.
CMND(490): 1,014 bytes max. (after the FINS command code), including broadcasting
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.)
The CPU Unit has eight communications ports. Use one communications port to execute commu-
nications instructions for the FL-net Unit.
Response monitor-
ing 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
Area Range
CIO Area CIO 0000 to CIO 6143
Work Area W000 to W511
Holding Area H000 to H511