Omron CJ - REFERENCE MANUAL 02-2010 Reference Manual page 965

• 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 broadcast to all of the nodes in
the designated network. This is known as a broadcast 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."
• When broadcast is specified, there is no response and no resending.
• 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.
Transmission through the Network
CMND(490) can be used to transmit any FINS
command to a personal computer or a PLC (CPU
Unit, Inner Board (CS Series only), or CPU Bus Unit)
connected by a Controller Link network or Ethernet
link.
Transmission through Host Link
When the CPU Unit's built-in serial port, a Serial
Communications Board (CS Series only), or Serial
Communications Unit is in host link mode and
connected one-to-one
CMND(490) can be executed to transmit any FINS
command from the PLC to the host computer the
next time that the PLC has the right to transmit. It is
also possible to transmit to other host computers
connected to other PLCs elsewhere in the network.
Issuing a FINS command to a device (a component or a PLC of a Host Link slave)
connected to a serial port (Serial Gateway)
• Sending to a Component
(Conversion to CompoWay/F, Modbus-RTU, or
Modbus-ASCII)
The serial gateway function can convert the fol-
lowing FINS commands to CompoWay/F, Mod-
bus-RTU, or Modbus-ASCII commands when the
FINS command is sent to a Serial Communica-
tions Board or Unit's serial port or one of the CPU
Unit's serial ports (peripheral or RS-232C).
Convert to CompoWay/F command: 2803 hex
Convert to Modbus-RTU command: 2804 hex
Convert to Modbus-ASCII command: 2805 hex
Note The Modbus-RTU and Modbus-ASCII commands cannot be sent to the CPU Unit's serial ports.
CS/CJ/NSJ Series Instructions Reference Manual (W474)
with a host computer,
PLC
Network
FINS command
Host computer
Host Link
FINS command
CMND
PLC
Modbus RTU
Serial cable
Modbus-RTU Slave device
3. Instructions
3
PLC
PLC
929