Experimental Physics and Industrial Control System
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Hi Andy,
On 7/25/22 9:49 AM, Hartman, Steven via
Tech-talk wrote:
I am curious to
know if anybody has found a good way to "replicate"
event posting across IOCs. I am thinking about utilizing
CPP flags, but not sure if that is a good solution.
If you can tolerate latency, each IOC can have its own
event record. One IOC hosts a trigger record which can then
use CA links to trigger processing of each of these event
records (e.g. fanout, CP/CPP links, etc.). If you cannot
tolerate the latency or need real-time performance, a
hardware-based timing system is typical.
Assuming you're looking for the slower network-based path you can
avoid having to create extra records for forward-linking to each
replica IOC by having the replica records process automatically
using a CPP link as you originally asked. Something as simple as
this may work, although I haven't actually tested it:
record(event,
"$(IOC)-local:event-$(EVENT)") {
field(INP, "event-$(EVENT) CPP")
}
Note that the value of the EVENT macro doesn't have to match the
actual event name/number, just the name of the record that it's
replicating. It will get the event name/number from the VAL field of
the originating record through the INP link. Using a CPP link like
this would also be more efficient than forward-linking or fanouts if
you have multiple IOCs that you're replicating the event to, since
all the replicas get notified by the same CA monitor being posted,
and the originating IOC doesn't need to know what other IOCs need to
be notified either.
- Andrew
--
Complexity comes for free, Simplicity you have to work for.
- Replies:
- Re: [EXTERNAL] Mimicking EVENT across IOCs Maren Purves via Tech-talk
- References:
- Mimicking EVENT across IOCs Wang, Andrew via Tech-talk
- Re: [EXTERNAL] Mimicking EVENT across IOCs Hartman, Steven via Tech-talk
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ANJ, 14 Sep 2022 |
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