The current text defines:
"In order to identify the purpose of a Logical Node with a more general name, a suffix for identification can be added. The limitation is that the sum of characters for prefix and suffix
shall not be more than 7."
IEC 61850-7-2 clause (as referenced by the TR 7-510) defines the maximum of prefix length plus suffix length as 12:
LNName = [LN-Prefix] LN class name [LN-Instance-ID]
LN-Prefix = m characters (application specific); it shall start with an alpha character
LN class name = 4 alpha characters, upper case (for example, compatible logical node name as defined in IEC 61850-7-4)
LN-Instance-ID = n numeric characters (application specific)
m+n = 12 characters
Proposal
Change current text to length = 12:
"In order to identify the purpose of a Logical Node with a more general name, a suffix for identification can be added. The limitation is that the sum of characters for prefix and suffix
shall not be more than 12."