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wandak
@wandak
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Joined: Mar 10, 2025
Last seen: Sep 22, 2026
Topics: 6 / Replies: 33
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RE: 1769-IF4 flow reading jumps 3 percent every scan, low flow alarm chatters

Filter's been in a 100 ms periodic task with K = 0.1 since yesterday afternoon. The number's steady to a gpm and it follows a pump start in a second o...

3 weeks ago
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RE: Logix PID loop swings with a 40 second period after moving it out of a periodic task

There's your 40 seconds. Open the PID, Configuration tab, look at the timing mode and the update time. I'd bet it's on periodic with .UPD at 0.5 to ma...

3 weeks ago
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RE: OEM wants TeamViewer on the FactoryTalk View SE PC for remote support, IT says no

What our remote sites and every OEM we work with accept is an outbound VPN router on the machine subnet. The box dials out to a broker, nothing inboun...

3 weeks ago
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RE: 4-20 mA vibration sensor on a pump motor, what threshold do I alarm at

It moves, yes. 2.1 at the normal 60 percent speed. 3.4 at full speed when the second zone calls. So the number depends on what the pump's doing at the...

3 weeks ago
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RE: Ignition historian grew 40 GB in a month from 300 tags, every analog logs every scan

Drop the radio sites to a 10 s scan class, pretty sure nothing on a pump changes faster than that, and the burst shrinks with it. Ours log at 10 s wit...

3 weeks ago
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RE: Pt100 on a 1769-IR6 reads 8 degrees high on an 80 m run

That's your 8 degrees. Wired as 2 wire the module measures the RTD plus both leads. 80 m of 0.75 is about 2 ohms a core, near 4 ohms for the pair, and...

3 weeks ago
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RE: All four OPC DA links to the historian died the same morning after Windows updates

Are those four links all remote DCOM, historian box to server box? And what's in the historian's Windows event log at 6.10, System and Application? Wh...

3 weeks ago
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RE: 1769-IF4 flow reading jumps 3 percent every scan, low flow alarm chatters

Moved the meter cable out of the tray it was sharing with the drive output leads, and the shield was grounded at both ends so that's at the panel bar ...

3 weeks ago
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RE: Modbus TCP through a serial gateway, exception 0B or no reply from every slave

Meter was 8E1 from the factory and the analyzers 8N1, and the gateway port can only be one of those, so the meter never decoded a request at all. Set ...

3 weeks ago
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RE: Finding compressed air leaks with a CompactLogix instead of a soap bottle

Two things the PLC can do. First, count load seconds per hour overnight: a timer on the load solenoid output, totalised per hour, stored. With the pla...

3 weeks ago
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RE: 1734-AENTR over industrial wifi drops 16#0204 a few times an hour

Didn't know there was one separate from the RPI, maybe I've never looked properly. I can't see it on the Connection tab, just RPI 20 ms and the inhibi...

3 weeks ago
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RE: Modbus TCP through a serial gateway, exception 0B or no reply from every slave

Unit IDs 2, 3, 4. Both analyzers read now and RX is blinking on the gateway. Flow meter still nothing, no exception either, the request just times out...

3 weeks ago
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RE: 4-20 mA level signal noisy since a PowerFlex 755 went in

Pulled the signal pair out of the duct and ran it in its own conduit for the last 20 ft, shield still grounded at the panel only. Flat now, 0.2%, with...

3 weeks ago
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RE: Modbus TCP through a serial gateway, exception 0B or no reply from every slave

Left at the default, 255 I think. All three SCADA devices point at the gateway's IP, port 502, with different register addresses. I never set a unit I...

3 weeks ago
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