I need to write data synchronously from Ignition thru PLC.
A command has parameters, I need to be sure the PLC receive all the parameter before the command to trigger PLC operation.
When I use :
system.tag.writeSynchronous
or system.tag.writeAllSynchronous
with an OPC SQlTags, is the write opeartion synchronous from Ignition , thru OPC-UA Server, thru PLC.
(My OPC-Server is Kep, with Siemens S7 protocol) ???
When I use :
system.opc.writeValue
or system.opc.writeValues
with opc item, is the write opeartion synchronous from Ignition , thru OPC-UA Server, thru PLC.
(My OPC-Server is Kep, with Siemens S7 protocol) ???
When the Data are writtent by an opc client connected to Configurated Tag exposed by Ignition OPC-UA Server (7.7 feature), how to achieve synchronous write from this OPC client thru Ignition, thru Kep, to the PLC.
If the client use synchronous write, it’s triggering a synchronous write in each layer ???
What is the best mean to obtain this kind of behaviors