A slave PLC can have up to three Uni-Telway addresses:
A server address, called Ad0, is obligatory and coded in the configuration. It enables access to the PLC system for adjustment, diagnostics or reading functions or writing variables, program loading and unloading, etc.
A client application address, called Ad1, is supplied optionally by the slave module configuration. This enables requests or messages requiring a response or not to be sent to another device connected on the Uni-Telway bus.
A listening application address, called Ad2, is supplied optionally by the slave module configuration. This enables Unsolicited Data (16#FC) requests to be received from another device connected on the Uni-Telway bus.
Addresses Ad1 and Ad2 are consecutive to the address Ad0 (Ad1 = Ad0 + 1 and Ad2 = Ad0+2).
Example:
|
Uni-Telway Link Address
|
Logical Entities
|
|
Ad0 = 6
|
System
|
responds to questions
|
|
Ad1 = 7
|
Client application
|
sends questions to a Uni-Telway server device
|
|
Ad2 = 8
|
Listening application
|
receives the "Unsolicited Data" request sent to the application
|
NOTE: When the Uni-Telway master is an SCM (series 7 PLCs), the application contained in the master must use the destination slave address (Premium) increased by 100 (16#0064).
