Technical data

SINAUT PG Routing
4.3 Application of PG routing
Software
446 System Manual, 07/2009, C79000-G8976-C222-07
4.3.3 PG routing in dial-up networks
There are PG functions that maintain constant message traffic with the CPU or the TIM after
they have started because these functions want to update themselves constantly. Such a
function in a dial-up network would lead to a permanent connection with the relevant station
until you deselect the function.
Other PG functions execute only once. They do not need constant updating. In a dial-up
network, in this case, the dial-up connection is established briefly and then terminated again.
If a continuous connection to a dial-up station is required with PG routing, it is advisable to
start a PG function at the beginning that requires constant updating regardless of the actual
PG function that has just been activated. This function should then be maintained while PG
routing is being used thus forcing a permanent connection. At the same time, other PG
functions can be performed.
The PG function most suitable for maintaining a permanent connection is the
Operating
mode
function. This requires little time to execute and the load on the other data traffic
caused by the constant updating is only minimal. Other suitable functions include
Module
Information
and Set Time of Day .
PG routing places load on the transfer of process data; in other words, this data is
transferred to the control center while the PG connection is established. This will will be
slower than when no PG routing is activated.
On the other hand, the parallel transmission of data messages also slows down the
reactions to PG functions that have started. This is particularly the case when the station TIM
is currently being used for PG routing and this TIM has a lot of stored messages, PG routing
will be very slow at the beginning. It is therefore advisable to give the station TIM the
opportunity to transfer its messages before intensive PG functions are started.
4.3.4 Canceling the PG/PC attachment in the SINAUT network
Canceling the PG/PC assignment
If a PG was assigned in a project and then needs to be used at a different location, for
example locally connected directly to a CPU or TIM, the assignment must first be canceled.
Follow the steps outlined below:
1. Right-click on the PG/PC that is still assigned in the project you have opened in
NetPro .
2. In the context menu that opens, select
Cancel PG/PC Assignment .
3. Acknowledge the warning dialog with
OK .
The PG/PC assignment is now canceled, this is indicated as follows in the network image
of
NetPro :
– The connecting line from the PG/PC to the MPI bus is no longer on a yellow
background.
– The yellow arrow in the PG/PC icon disappears
4. Save your project in
NetPro .