FAQ: What could be the problem if a computer cannot communicate to a LEGEND-MC over Ethernet?
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Any device that attempts connection via Ethernet must have a unique IP (Internet Protocol) address. Having an IP address for a device is much like having a phone number for a telephone. As it would be impossible to make a call without a phone number, a connection cannot be established with a device if it does not have an IP address.
Many networks use a service called DHCP (Dynamic Host Control Protocol) that automatically assigns IP addresses as devices log on to the network. If the PC has not been connected to the network (that uses DHCP), it does not have an IP, therefore cannot connect to the LEGEND-MC . The PC must be configured (using Network Properties) to have an IP address. The Legend-MC must also be configured to have an IP address, using the IA command. (Remember that the IP address assigned to the LEGEND-MC will not be saved during a power cycle unless the BN command is used).
What to set the IP address to? This depends on how the PC TCP/IP properties are configured. If the PC has a static IP address of 192.138.7.1 and the Subnet mask is set to 255.255.255.0, the first three places of the IP address for the Legend MC must be the same as the PC. The last place must be different than the PC or any other device on the network. Be careful assigning IP addresses while on a network, as there are proper protocols in place regarding IP address usage/assignment.
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Please read and understand the product instruction manual before installing, servicing or operating Yaskawa products. FAQ content and illustrations are provided as technical advice to augment the information in manual, not supersede it. It is not possible to give detailed instructions for all types of installation or support activities. The information described in the FAQs are subject to change without notice to improve the product or FAQ. Yaskawa assumes no responsibility for errors or omissions or damages resulting from the use of the information contained in any FAQ. All warnings, cautions and product instruction for product use must be followed. Installation, operation and maintenance should be carried out by qualified personnel. Failure to observe these and other precautions highlighted in the product manuals will expose the user to high voltages resulting in, serious injury or death. Qualified personnel are defined as individuals who are familiar with the installation, starting, operation and maintenance of Yaskawa products of the type described and have proper qualifications to perform the work.
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