testsubject
Member
So, after a little bit of investigation ...
IEC 62491 specifies several different alowable methods for wire numbering.
These possible methods are:
0. No marking. All wires can be followed visually.
A. Marking of the cable manufacturer. The wire no or color of the wire is used.
R. Identification marking. Each individual wire can be identified.
CL. Local connection marking. The wire end is identified by the connection point on the local device.
CR. Remote connection marking. The wire end is identified by the connection point on the remote device. componection.
S. Signal marking. The wire is labeled with the signal it carries.
And you can combine several of those.
CL is NOT the method described previously by labeling the wire with only the connected device's terminal no (i.e. ":A1"). CL requires that you use the full name of the device (i.e. "=H22-Q3:A1").
"By net" would correspond to method S.
"By wire" would correspond to method R.
edit:
@testsubject, I did not remember exactly the IEC standard that defined wire numbering. IEC 60204-1 is the "mother" that refers to all the other standards.
I am pretty well versed in 60204; I was the safety engineer at a previous employer.
The CL version was the one I was referring to; I did not include the Location Code [=XXX] because that is only applicable if there are multiple Locations involved and it is not clear which terminal is being referred to.
Do you have a newer book for 61849:20008? The one I have does not reference the methods like you did (0,A,R.etc),. I did find that the Signal is a supplementary label (7.1), not a primary label.
We decided to follow CL due to 61666 stating that the terminals have to be uniquely identified. We did not like having each wire with the same signal label going to different terminals. (24V could go to the following terminals; TS1:1, TS1:2 ,TS2:1, TS2:2, etc...)
Has this been changed? (I like to stay current).