Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 223)

Publication 1753-UM001C-EN-P - March 2010 223
Use GuardPLC Controller as an Adapter Chapter 19
To open an input only connection, follow these steps.
1. Choose Input Data — SINT in the Comm Format field.
2. Type the GuardPLC controller’s Input Assembly instance number
in the Input Assembly Instance field.
3. Type the size of the input assembly in bytes in the Input Size
field.
4. Type the Output Assembly instance number as 199.
This is the heartbeat instance number, a virtual number that is
not associated with any real assembly. It indicates to the
GuardPLC controller that there will be no data coming from the
scanner.
5. Click Next and type the desired packet rate for this connection
in milliseconds.
6. Click Finish.
Listen Only Connections
Listen only connections are similar to input only connections, but all
subsequent input only connections are dependent upon the first input
only connection, which is the owner connection. When an owner
connection is closed, all subsequent listen only connections are also
closed.
IMPORTANT
This entry must exactly match the size of the input
assembly, or the GuardPLC adapter controller will return
an error.
The size of the input assembly is determined during the
signal connection process.