Communicate signals between AC800m and PLC_Connect
In one project I have a number of AC800m.
PLC_connect is not in the project just in 800xA.
I need a signal from PLC_Connect (172.16.4.x) to AC800m (172.16.80.x) for some calculations.
In PLC_Connect there are var1 (double) shown in one operator display.
In the AC800m there are var2 (real) shown in one operator display.
In AC800m I want to make a signal X = var1 + var2.
How should I communicate var1 to the AC800m?
MMS? but where do you set access variables in this case?
I tried to make a InputField1 that sets var3 in AC800m, but I do not come up with how to put InputField1's property reference eg "var3: = var1", it only works setting property reference = "var3"
Does anyone have any ideas?
1. Adding 2 numbers. Do this in a PLC. Never do maths in a graphic, that's not what graphics are for.
2. Copying a value from PLC A to PLC B
This is just a Property Transfer. Create the Property Transfer definition aspect on the receiving property end of the link. The transfer will cyclically copy data from one OPC server to another. The "Source" property is a "Tag:Aspect:Property" in the remote object and the destination is a "Property" in the receiving object.
MMS is for communication between two AC800M controllers. If your PLC Connect system is using AC800M then just define an MMS Access variable in the source PLC and read that value from the destination PLC. You can use MMS instead of a property transfer.
OPC Data Link is a product to support Legacy ABB Control systems like MOD300 that cannot respond properly to large volumes of OPC requests. It is only required in some very specific situations ( E.G. trying to integrate a MOD300 with a Paper Machine QCS. )