Omron CJ - INSTRUCTIONS

905
3. Instructions
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Network Instructions
3
Network Instructions
Serial Gateway Communications with a Component or Host Link Slave
It is possible to send FINS commands (or send/receive data) to a component or Host Link Slave
connected to the PLC through its serial port with the serial gateway function.
• Sending to a Component
When a CMND(490) or CMND2(493) instruction is executed to a
serial port that supports the serial gateway function, the serial
gateway function converts the command to a CompoWay/F,
Modbus-RTU, or Modbus-ASCII command.
• Sending to a PLC Operating as a Host Link Slave
When a CMND(490), CMND2(493), SEND(090), SEND2(491),
RECV(098), or RECV2(492) instruction is executed to a serial
port that supports the serial gateway function, the serial gateway
function can send any FINS command or send/receive data.
z Communications from a Host Computer Connected through Host Link
It is possible to send FINS commands from a host computer to the PLC to which it is connected as well
as other devices in the network (CPU Units, Special I/O Units, computers, etc.). In this case, the
necessary Host Link header and terminator must be attached to the FINS command when it is sent.
Serial cable
Modbus-RTU Slave device
Modbus RTU
CMND
PLC
Serial cable
PLC
Host Link Slave
CMND
PLC
Host link FINS
Host computer
Host Link
Host Link header
Host Link FCS
and terminator