Zw Communications For Ethernet/Ip Connections - Omron ZW-C1*AT User Manual

ZW Communications for EtherNet/IP Connections

You can use EtherNet/IP tag data links to communicate between the PLC and the Displacement Sensor to
perform control via command/response communications or to output data after measurements.
The ZW complies with EtherNet/IP conformance test version A9.
To connect to OMRON Controllers and communicate through EtherNet/IP, you use the Network Configurator to
set up tag data links (i.e., tags, tag sets, and connection settings).
Refer to the following manuals for details on the tag data link settings that are made with the Network
Configurator.
• NJ-series CPU Unit Built-in EtherNet/IP Port User's Manual (Cat. No. W506)
• CS/CJ-series EtherNet/IP Units Operation Manual (Cat. No. W465)
• CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (Cat. No. W495)
Types of Communications
● Command/Response Communications
With EtherNet/IP communications, cyclic tag data link communications are performed with the connections that
are set between the PLC and Displacement Sensor.
Command/response control signals are handled by storing control commands from the PLC to the
Displacement Sensor and responses from the Displacement Sensor to the PLC in the I/O memory of the PLC.
This allows you to control the operation of the Displacement Sensor (e.g., perform continuous measurements
or change the scene) without using special communications instructions.
• Input Connection to Sensor (PLC to Displacement Sensor)
The commands that are stored in the I/O memory of the PLC are sent to the Displacement Sensor.
• Output Connection to PLC (Displacement Sensor to PLC)
Responses from the Displacement Sensor to the control commands are stored in the PLC I/O memory addresses
or variables that are specified for the response area.
I/O memory or variables
(communications areas)
To send a control command, you write a control command to the command area (i.e., a variable or I/O memory
address in the PLC) that is specified for the output tag, and then turn ON the Command Execution (EXE) Bit.
As a result, the control command is sent through the input connection from the PLC to the Displacement
Sensor.
A control command does not need to be sent to execute measurements for the TRIG bit.
The measurement is executed simply by turning ON the TRIG bit.
The Displacement Sensor executes the control command and sends a response back to the PLC through the
output connection from the Displacement Sensor to the PLC.
The PLC stores the response in the response area (i.e., I/O memory addresses or variable) that is specified for
the input tag in the PLC.
200
EtherNet/IP Connection
PLC
CPU Unit
Input connection to Sensor
Command area
Response area
Output connection to PLC
EtherNet/IP (tag data links)
Displacement Sensor
• TIMING input
• Bank number switching, etc.
Command
Response
OK, etc.
ZW User's Manual