Omron CS1W-CLK12-V1, Operation Manual

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6
Overview Section 1-1
The RECV instruction requests the designated node to send area data and
writes the data to the local node.
CMND The CMND instruction issues a command to read or write data of other
nodes, control, or read error logs. With the Controller Link Unit, OMRON’s
command protocol called “FINS commands” is used.
RAS
RAS performs real-time monitoring of the network status. If an error occurs in
the network, RAS records and displays the time and contents of the error.
Status Area Data Link Status Area
When the data link function is used, the data link status is reflected in the data
link status area of the PLC.
Network Status Area Other than the Data Link
The network status such as the state of node participation is reflected in the
status area of the PLC.
Error Log The error log function records contents (codes) and times of errors that occur
in the network into the RAM or EEPROM, up to the maximum of 39 errors.
The recorded errors can be read using the Controller Link Support Software
or the message service function.
Node Bypass Data communications can be continued by bypassing the node, even when a
node in the communications line malfunctions or the PLC or IBM PC/AT or
compatible computer power supply is turned OFF. This prevents the whole
network system from being affected by a node malfunction or power interrup-
tion.
To use the bypass node function, backup power must be supplied to the Con-
troller Link Unit/Support Board.
Controller Link Unit
CPU Unit
Status Area
•
Data link status
•
Status other than the data link
CPU Unit
Controller Link Unit
Controller Link Unit
CS-series
CPU Unit
Error log table
CVM1, CV-
series CPU
Unit
Controller Link Unit
Power interruption
Optical transmission path
Bypass
IBM PC/AT or
compatible computer
Backup
power supply
(24 VDC)
PLC PLC PLC