If I slow down how often we ask for data it only seems logical that the Error frequency would also be reduced.
This by itself is not a resolution. Using that logic then I could eliminate the errors by only asking for data once per hour which is not realistic.
And one second is probably slower than we want also.
You can tell when the entire configuration has been polled due to the Subnet LED being a Solid Green. (Starts out flashing Green until all messages have been transmitted)
I agree that the Transactions do look like they are ok.
I am unable to capture a red flash in the Log (with this configuration) due to the long time between flashes.
The Raised Reply (I think you are referring to as a “Spike”) is from a different probe from Hamilton we put on the bus to test if that probe has a problem with the HMS as a master.
It seems to work fine (data is always received from this probe) even though the Bus Voltage level looks strange.
I had removed the Biasing resistors a few days ago and they were not on when I took that scope capture.
At one time I had a configuration that only had the Hamilton Probe on the bus and queried every 50 ms. I had no problems with it. (No red flashes and I watched it for > 5 minutes).
We have reached out to the Metler Toledo Probe MFG and they are going to try to repeat our test.
I also have reached out to Hamilton regarding the Bus Voltage level shift… Waiting to hear back from them.
On another note: Yesterday morning when I came in, None of the probes were replying to the HMS Master. (Log file showed timeouts for every query).
I had to power down the probes to get them to talk again.
If you remember, I have seen that a few times before when I had captured that log where it looked like the Master was sending nonsense out on the bus.
At this point I’m thinking that happened again overnight.
There may also have been a Power outage overnight as I saw my PLC I/O alarms were all latched in (which does happen when I cycle power).
I may try a few more of these to see if I can repeat the problem.