JeremyM
Lifetime Supporting Member
OP
Contributions welcome (and credited!). I suppose by DM / dropbox link. Or I can set you up as a repository contributor.
LogixLibraries - Your New GitHub Resource
- Thread starter JeremyM
- Start date
cardosocea
Member
I'll arrange a drop box link for you and send it across.
JeremyM
Lifetime Supporting Member
OP
Thank you sir.
Please include name or however you prefer to be credited.
Please include name or however you prefer to be credited.
JeremyM
Lifetime Supporting Member
OP
Monitor your controller's or another module's USB port for activity:
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TheWaterboy
Lifetime Supporting Member + Moderator
Looking for ideas?
How about a fast hash function just to look for any change in an array of tags. Would be used to indicate a setpoint change that needs to be written. Helpful with slow polling telemetry systems.
Indicate a new rising transition of any single bit in an array of bits ignoring falling edges. Useful to detect new alarm bits that need to trigger a process.
Both can be done other ways but since you are creating AOIs...
How about a fast hash function just to look for any change in an array of tags. Would be used to indicate a setpoint change that needs to be written. Helpful with slow polling telemetry systems.
Indicate a new rising transition of any single bit in an array of bits ignoring falling edges. Useful to detect new alarm bits that need to trigger a process.
Both can be done other ways but since you are creating AOIs...
JeremyM
Lifetime Supporting Member
OP
Looking for ideas?
How about a fast hash function just to look for any change in an array of tags. Would be used to indicate a setpoint change that needs to be written. Helpful with slow polling telemetry systems.
Indicate a new rising transition of any single bit in an array of bits ignoring falling edges. Useful to detect new alarm bits that need to trigger a process.
Both can be done other ways but since you are creating AOIs...
Interesting problem.
Wouldn't the act of maintaining a hash require continuous array passes? Or is insertion/deletion/update 'interfaced' and the hash computed only then?
JeremyM
Lifetime Supporting Member
OP
What if I told you that DataLinks can be dynamic?
theColonel26
Lifetime Supporting Member
What is a DataLink?
dmroeder
Lifetime Supporting Member
When you add a PowerFlex 525 to the I/O tree, for example, there is a default data type, which includes some basic stuff. Start/stop, fault, frequency command, etc. If you want some additional control or feedback, you can add input and output parameters. Rockwell refers to these additional parameters as datalinks. The term dates back well before PF525's.
Normally, to edit these, you have to make the change offline and download. There is a new predefined data type for each datalink configuration.
What I think Jeremy is saying is that you can change these on the fly.
Jeremy, tell me datalinks can be dynamic. Inquiring minds want to know
JeremyM
Lifetime Supporting Member
OP
Yes they can be (and are).
It starts with a generic module of the sum total size of the possible datalinks, in each direction. PF525 in this example. Input 16 bytes, output 12 bytes, configuration 0 bytes. Even if you don't use datalinks, the drive accepts this connection.
The configuration bytes being zero are the real key to it - the AOP places the parameter instance numbers in this array to "key" the connection to these parameters, hence why the download is necessary from the PLC side and why the drive requires you to preconfigure it with the datalinks. If you instead push these parameters by message (or even by hand) to a drive with a zero-config IO connection, you just need to momentarily inhibit the connection to get them to reflect the change. I'm 99.99997% sure this method will work with other equipment including the 750 series and its 20 datalinks.
It starts with a generic module of the sum total size of the possible datalinks, in each direction. PF525 in this example. Input 16 bytes, output 12 bytes, configuration 0 bytes. Even if you don't use datalinks, the drive accepts this connection.
The configuration bytes being zero are the real key to it - the AOP places the parameter instance numbers in this array to "key" the connection to these parameters, hence why the download is necessary from the PLC side and why the drive requires you to preconfigure it with the datalinks. If you instead push these parameters by message (or even by hand) to a drive with a zero-config IO connection, you just need to momentarily inhibit the connection to get them to reflect the change. I'm 99.99997% sure this method will work with other equipment including the 750 series and its 20 datalinks.
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dmroeder
Lifetime Supporting Member
I'm pretty sure I remember you saying you used the generic module in order to solve the obnoxious AOP issues when new revisions come out. You effed around and found out, nice!
JeremyM
Lifetime Supporting Member
OP
If you really want to have "fun" you could put the Generic:C to use as a general-purpose 400 byte message buffer to save memory and tag database usage.
theColonel26
Lifetime Supporting Member
Ok I'm dumb what is an AOP. What is the AOP problem?
I haven't really touched Rockwell in a year. I have been using codesys.
I haven't really touched Rockwell in a year. I have been using codesys.
theColonel26
Lifetime Supporting Member
Ok a AOP is a "Add-On Profile" for EIP devices but I still don't know what that is. Is thst just like a UDT thst is provided by rockwell?
dmroeder
Lifetime Supporting Member
AOP = Add On Profile. It is the definition of a thing in the I/O tree. You need to install AOPs for major revisions of firmware for some I/O tree devices.
Each time a new major revision of PowerFlex 525 comes out, for example, they will release a new AOP, which you have to install in order to configure the drive from the tree. The latest is v7.0, at least last time I checked. If I were to add a v7.0 drive to the I/O tree and you don't have the v7.0 AOP installed, it is going to show up as unknown when you open it.
Using Jeremy's method of adding generic modules to the tree instead of using the official RA AOP eliminates the dependency of having to have the AOP installed. You wouldn't have access to parameters like you normally would by using the AOP, though it sounds like Jeremy has largely worked around that.
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