Moeller S40-AM-TD, Руководство пользователя

Страница: 68 / 85

Password
65
02/02 AWB27-1300-GB
Service 33 – Send information string
Each telecontrol station can protect itself against
unauthorised access by other stations via the “lock_station”
function block input. In these circumstances, all incoming
services other than service 33 are rejected.
Example:
Station A operates as central station and station B as the
partner station. Station B has protected itself from access by
other stations via the “lock_station” FB input. The password
of station B is “Model_station”.
After connection has been successfully established via
station A with the dial-up function block, the station sends
the text string “Model_station”
(tra_information:=´Model_station´) to station B using the
service 33. The text string is indicated there at the telecontrol
function block output “rec_information”
(Model_station:=rec_information).
The text string received is then compared with an internal
password and, if it matches, the “lock_station” function
block input is reset. Station A can now exchange all available
services with station B.
If the connection between the stations is cleared, the
content of the “rec_information” function block output
(empty string) is set and the “lock_station” function is
reactivated.