Omron SYSMAC CJ1W-EIP21, Operation Manuals

Page: 180 / 438

7 Tag Data Link Functions
7-50
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
To make tag data links, you must download tag data link parameters, such as tag set settings and con-
nection settings, to all devices in the EtherNet/IP network. When the download operation is executed,
the tag data link parameters are transferred to the EtherNet/IP Units that require the settings.
The following procedure shows how to download the tag data link parameters. Refer to 7-2-8 Connect-
ing the Network Configurator to the Network for information on how to Connect the Network Configura-
tor online.
Precautions for Correct Use Precautions for Correct Use
• If the node addresses (IP addresses) are not set correctly, you may connect to the wrong Con-
troller and set incorrect device parameters. Download data only after you confirm that you are
connected to the correct Controller.
• If incorrect tag data link parameters are set, it may cause equipment to operate unpredictably.
Even when the correct tag data link parameters are set, make sure that there will be no effect
on equipment before you transfer the data.
• When network variables are used in tag settings, a connection error will result if the variables
are not also set in the CPU Unit. Before downloading the tag data link parameters, check to
confirm that the network variables are set in the CPU Unit. Check whether the network vari-
able, tag, and connection settings are correct. On the Connection and Tag Status Tab Pages
described in 13-1-1 The Network Configurator's Device Monitor Function.
• If a communications error occurs, the output status depends on the specifications of the
device being used. When a communications error occurs for a device that is used along with
output devices, check the operating specifications and implement safety countermeasures.
• The communications port for the EtherNet/IP Unit is automatically restarted after the parame-
ters are downloaded. This restart is required to enable the tag set and connection information.
Before you download the parameters, check to confirm that problems will not occur with the
equipment when the port is restarted.
• Do not disconnect the Ethernet cable or reset or turn OFF the power to the EtherNet/IP Unit
during the parameter download.
• Tag data links (data exchange) between relevant nodes is stopped during a download. Before
you download data in RUN mode, make sure that it will not affect the controlled system. Also
implement interlocks on data processing in ladder programming that uses tag data links when
the tag data links are stopped or a tag data link error occurs.
• For EtherNet/IP Units with revision 2 or later, the CPU Unit can download tag data link param-
eters in RUN mode. (They can also be downloaded in PROGRAM mode.) Tag data links (data
exchange) between relevant nodes is stopped during a download. Before you download data
in RUN mode, make sure that it will not affect the controlled system. Also implement interlocks
on data processing in ladder programming that uses tag data links when the tag data links are
stopped or a tag data link error occurs.
• For EtherNet/IP Units with revision 1, you can download tag data link parameters only when
the CPU Unit is in PROGRAM mode.
• Even for Units with revision 2 or later, all CPU Units must be in PROGRAM mode to download
the parameters if any Units with revision 1 are included in the network.
7-2-9 Downloading Tag Data Link Parameters