Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 1103

Network Instructions
Sending a FINS Command
to the CPU Unit Executing
CMND(490) (Except for
CS-series CS1 CPU Units
Prior to V1)
1064
CMND
PLC
Modbus RTU
Serial cable
Modbus-RTU Slave device
• Sending to a PLC operating as a Host Link Slave
The serial gateway function can be used to send any FINS command to a
PLC that is connected as a host link slave and through a Serial Communi-
cations Board or Unit's serial port. In this case, the destination node ad-
dress must be set to the host link unit number + 1.
SEND
PLC
Set the destination node address to the
host link unit number + 1 = S+1.
Data
Serial cable
The CPU Unit executing CMND(490) can send a FINS command to itself
(excluding CS-series CS1 CPU Units without a suffix of -V@). For example,
file memory commands (command codes 22@@ hex) can be sent to format
file memory, delete files, copy files, and perform other operations. Refer to 5-2
Manipulating Files of the CS/CJ-series CPU Unit Programming Manual for
details.
The File Memory Operation Flag (A34313) will turn ON when any FINS com-
mand is sent to the local CPU Unit (even for FINS commands not related to
file memory). Always use A34313 in an NC input condition for CMND(490) to
ensure that only one FINS command is being executed for the CPU Unit at the
same time.
PLC
Host Link Slave
Host link unit number: S
FINS command
PC
Memory Card
EM file memory
Section 3-25