PLC Programming

General Online Functions...
'Online' 'Communication Parameters'
You are offered a special dialog for setting communication parameters when the communication
between the local PC and the run-time system is running over a gateway server in your system. (If the
OPC or DDE server is used, the same communications parameters must be entered in its
configuration).
See the following items:
Principle of a gateway system
Communication Parameters Dialog for the local PC
Principle of a gateway system
Principle of a gateway system
Let us examine the principle of the gateway system before explaining the operation of the dialog:
A gateway server can be used to allow your local PC to communicate with one or more run-time
systems. The setting concerning which run-time systems can be addressed, which is specifically
configured for each gateway server, and the connection to the desired gateway server, is made on the
local PC. Here it is possible that both the gateway server and the run-time system(s) can run together
on the local PC. If we are dealing with a gateway server which is running on another PC we must
ensure that it has been started there. If you are selecting a locally installed gateway server, it
automatically starts when you log onto the target run-time system. You can recognise this through the
appearance of a CoDeSys symbol on the bottom right in the task bar. This symbol lights up as long
as you are connected to the run-time system over the gateway. The menu points Info and Finish are
obtained by clicking with the right mousekey on the symbol. Finish is used to switch off the gateway.
See the following scheme for presenting a gateway system:
PC_local is your local PC, PC_x is another PC, which gateway addresses. PC_gateway is the PC on
which the gateway server is installed, PC_PLC1 through to PC_PLC4 are PCs on which the run-time
systems are running. The diagram shows the modules as separated but it is fully possible for the
Gateway server and / or run-time systems to be installed together on the local PC.
Important: Please note that a connection to gateway is only possible over TCP/IP so make sure that your PC is
configured appropriately!
The connections from gateway to the various run-time computers can, on the other hand, run over
different protocols (TCP/IP, Pipe, etc.).
Tips for editing the parameters in the communications parameters dialogue
You can only edit the text fields in the column Value.
Select a text field with the mouse, and get into the editing mode by double clicking or by pressing the
space bar. The text input is finished by pressing the key.
You can use or + to jump to the next or the previous switching or
editing possibility.
4-60 CoDeSys V2.3