Echelon OpenLNS User Manual

Page 1036

OpenLNS Programmer's Reference

999

A network can use up to 12288 selector values. Unrelated connections will normally

require unique selector values. Intersecting connections automatically use the same

selector Network variable aliases are used automatically to resolve selector conflicts on a

node (i.e. to eliminate this exception from occurring), although this uses up one selector

for each alias. Starting in LNS 2.0, selector values are grouped into categories, with one

category being "shareable". Non-intersecting, point-to-point connections may reuse

selector values from this category any number of times. This is done automatically by the

OpenLNS Object Server.
lcaErrConnMtagInConnAlready

With the exception of the special message tag msg_in, a message tag may only appear in

one connection. This error will occur when a connection was attempted that violated this

constraint.
lcaErrConnAuthenticationMismatch

This error will occur when not all members of an attempted connection have the same

setting for authentication.

It is possible to connect an authenticated output to a non-authenticated input, but an

authenticated input must be connected to an authenticated output. A polling input must

be authenticated if any of the targeted outputs are authenticated.
lcaErrConnGrpTooLargeForAckd

This error will occur when an attempt is made to form a connection of more than 64

members that uses acknowledged service. Only unacknowledged or

unacknowledged/repeat service is allowed for connections with more than 64 members.

Such a connection must be built using a connection description that specifies one of these

service types.
This error may also occur when polled output network variables or polling input network

variables are involved in the connection.
lcaErrConnUnackdWithAuth

An attempt was made to form a connection using authentication but not using the

acknowledged service type.
The authentication process is composed of four messages, 2 of which are using the

Acknowledged service. This is why using the authentication service without the

Acknowledged service is illegal.
lcaErrConnAuthOnUnauthNode

An attempt was made to form an authenticated connection with an unauthenticated

node. Only nodes with the AuthenticationEnabled set to True are permitted to

participate in authenticated connections.
lcaErrConnBcastSubnetsDiffer

An attempt was made to subnet broadcast, but the devices are not all in the same

subnet. This error is not currently generated, since the broadcast type used is

determined automatically.
lcaErrConnNewBcastCausesNvLeak

An attempt was made to use broadcast addressing, but a network variable leak was

detected on another node. A network variable leak means that update messages for the