Summary/Issue Description
When customer connect to the PLC using CJ1W-EIP21S, it does not request user authentication
Root Cause
The necessary settings were not made in the 'Change PLC' dialog box, or the user authentication settings were not saved.
Solution
To use secure communications, you must save the user authentication settings to the CS1W/CJ1W-EIP21S EtherNet/IP Unit in advance using the EIP21S User Management Tool.
EIP21S EtherNet/IP Units are shipped from the factory with the user authentication settings initialized. Therefore, when connecting online for the first time, first register the administrator using the EIP21S User Management Tool and then register other users.
Note: With the user authentication settings initialized, you cannot connect the CX-Programmer and PLC Backup Tool online using secure communications.
This Administrator Registration is performed by a person responsible for management of the target PLC system.
1. Using the EIP21S User Management Tool, connect online to the CS1W/
CJ1W-EIP21S EtherNet/IP Unit.
Enter the IP address of the Unit to connect to in IP Address in the Communication Settings group and click the Connect Button.
The Administrator Registration Dialog Box is displayed.
2. Enter the administrator’s user name, password, and password expiration
days and click the OK Button.
A notification dialog box will be displayed to notify you of the completion of
the administrator registration.
Click the OK Button. You are now offline.
3. With the user name and password registered in step 2, connect online to the EtherNet/IP Unit as the administrator.
You are now online.
4. You can register user data for other users (optional).
If the error persists, make the following settings in the “Change PLC” dialog Box.
Device type:
Select the type of the CPU Unit to connect to
Network type:
• Select Secure Comm.
• Click the Settings Button and enter the IP address of the CS1W/CJ1W-EIP21S EtherNet/IP Unit to connect to in IP Address in Target PLC.
With the settings made as described in Settings, select Work Online from the PLC Menu to connect online.
After this, you will be subject to user authentication and, if successful, go online with the EtherNet/IP Unit.
Date/Revision History
First review 01/30/2025 V1.0
2nd review 02/04/2025 V1.1
Author:
Javier Romo, Technical Support Engineer.
References
CJ1W-EIP21S Operation Manual:
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