Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 1101

Network Instructions
Transmission through the
Network
The CPU Unit executing CMND(490) can send a FINS command to itself
(except for CS-series CS1 CPU Units prior to V1@). Use the following control
data settings to achieve this.
• Destination network address (bits 00 to 07 of C+2): 00 hex (local network)
• Serial port No. (bits 08 to 11 of C+2): 0 hex (not used)
• Destination unit address (bits 00 to 07 of C+3): 00 hex (CPU Unit)
• Destination node address (bits 08 to 15 of C+3): 00 hex (local node)
• Number of retries (bits 00 to 03 of C+4): 0 hex (this setting is invalid; set it
to 0)
• Response monitoring time: (bits 00 to 15 of C+5): 0000 to FFFF hex (but
0000 will specify 6553.5 s, and not 2 s as normal)
If the destination node number is set to FF, the command data will be broad-
cast to all of the nodes in the designated network. This is known as a broad-
cast transmission.
If a response is requested (bits 12 to 15 of C+4 set to 0) but a response has
not been received within the response monitoring time, the command data will
be retransmitted up to 15 times (retries set in bits 0 to 3 of C+3). There will be
no response and no retries for broadcast transmissions. For instructions that
require no response, set the response setting to "not required."
An error will occur if the amount of response data exceeds the number of
bytes of response data set in C+1.
FINS command data can be transmitted to a host computer connected to a
PLC serial port (when set to host link mode) as well as a PLC (CPU Unit,
Inner Board (CS Series only), or CPU Bus Unit) or computer connected
through a Controller Link or Ethernet network.
If the Communications Port Enabled Flag is ON for the communications port
specified in C+3 when CMND(490) is executed, the corresponding Communi-
cations Port Enabled Flag (ports 00 to 07: A20200 to A20207) and Communi-
cations Port Error Flag (ports 00 to 07: A21900 to A21907) will be turned OFF
and 0000 will be written to the word that contains the completion code (ports
00 to 07: A203 to A210). The command data will be transmitted to the desti-
nation node(s) once the flags have be set.
CMND(490) can be used to transmit any FINS command to a personal com-
puter or a PLC (CPU Unit, Inner Board (CS Series only), or CPU Bus Unit)
connected by a Controller Link network or Ethernet link.
PLC PLC
Network
FINS command
Section 3-25
1061