Omron CS1G/H-CPUxxH Instructions Manual page 914

Network Instructions
Transmission through the
Network
Transmission through
Host Link
• 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 hasn't
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.
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 con-
nected one-to-one with a host computer, 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.
Host computer
Host Link
CMND(490) can be executed for the either port on the CPU Unit, a Serial
Communications Board (CS Series only), or Serial Communications Unit to
send a command to the connected host computer. (Specify the serial port as
1 Hex or 2 Hex in bits 08 to 11 of C+2.) The command is a FINS message
PLC PLC
Network
FINS command
FINS command
Section 3-25
PLC
893