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Troubleshooting tags in error

Chapter 7.

7. Troubleshooting tags in error

A tag value displayed in red in the View IO page indicates that the quality for this value is

considered as bad. When the quality of the tag is bad, a red icon is displayed in the column

between the tag's name and the tag's value. As long as the quality of the displayed value is good,

no icon appears in this column. More information about the nature of the problem can be obtained

by placing the mouse cursor on the icon as shown below:

or:

Note: A single tag in error (truly bad) can cause a number of other (good) tags to appear in error

as well because, for communication optimization purposes, tag requests and responses are

grouped in one single envelope. The whole group is then affected with the same error status.

During commissioning or maintenance, you may want to isolate the truly bad tag from the others.

Therefore, you have to disable the polling of tags in error. This can be done in the IO Server >

Global Config parameters as shown below:

The relevant tag will no longer be polled and it will no longer be included in a group (and hence it

will not affect other tags). Remind yourself to uncheck this box and initialize the IO Server, by

clicking the Init link as shown above, as soon as you have completed your commissioning or

maintenance task.

Polling Data Registers from Siemens S7-200 PLC Series (How to) Page 16/21

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Siemens S7-200PLC Manual de usuario Pagina 16