Omron SYSMAC CJ1W-SCU21-V1, Operation Manual

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Appendix D
Host Link FINS Command Master
The Host Link FINS Command Master Protocol provides communications sequences using FINS commands
with the CS/CJ-series PLC as the host (master).
This protocol is used to send user-specified or specific (e.g., MEMORY AREA READ) FINS commands
enclosed in a Host Link header and terminator from a Serial Communications Unit/Board installed in a CS/CJ-
series PLC connected through RS-232C or RS-422A/485 to a CS/CJ-series CPU Unit or to a Special I/O Unit
or CPU Bus Unit on the network.
Note Slave-initiated operation from the PLC slave is not supported.
1, 2, 3... 1. Sending to a PLC Slave Directly Connected to the Serial Communications Unit/Board
Note The remote destination network address (DNA) specifies the local network address (00 hex), the remote
destination node address (DA1) specifies the local node (00 hex), and the remote destination unit
address (DA2) specifies the CPU Unit in the PLC Slave (00 hex).
2. Sending to a CPU Unit on the Network
Note 1. The response monitoring time for both sending methods 1 and 2 is 3 s. These commands can
be sent across up to 3 network levels.
2. Slave-initiated FINS commands sent from the PLC slave to the PLC master are not supported
for either method 1 or 2.
Network
Communications Unit
Host Link mode (Host Link master)
FINS command
Protocol macro mode
(Host Link master)
Serial Communications Board/Unit
Communications Unit
CPU Unit
FINS command
PLC on network
Network (Controller Link, Ethernet, etc.)
CS/CJ PLC
CS/CJ or
CVM1/CV PLC
Personal computer on network
Communications Board
PMCR
(260)
Serial Communications Unit/Board
Protocol macro mode
Host Link mode
PLC master
PLC slave
FINS command
FINS command
Serial Communications Unit/Board
Protocol macro mode
Host Link mode
PLC master
PLC slave
PLC slave
Network (e.g., Controller Link, Ethernet)
Host Link