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petek
@petek
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Joined: Feb 27, 2025
Last seen: Sep 22, 2026
Topics: 6 / Replies: 39
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RE: Logix PID loop swings with a 40 second period after moving it out of a periodic task

Back in the 500 ms periodic task since last night. Trend's flat again, within half a degree, gains untouched. .UPD was 0.5 exactly as you said. So my...

3 weeks ago
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RE: 1756-EN2T racks fault 16#0203 hourly, HMI PC freezes ten seconds at a time

It does that for unicast. Your I/O connections are multicast, and an unmanaged switch has no IGMP snooping, so it floods every multicast frame out of ...

3 weeks ago
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RE: S7-1500 MAINT LED yellow after adding a switch, PROFINET all running

That's it exactly. The topology in the project still says CPU port 1 to io-st1 port 1, and LLDP now tells the CPU its neighbour is the XB208. Not cosm...

3 weeks ago
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RE: 1756-OB16E output tag is 1 but the solenoid has no voltage

Point 9 does nothing either. 3 works. So the top eight are dead and the bottom eight are fine. Fuse, meaning what, its a replaceable fuse? Nothing on ...

3 weeks ago
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RE: 30 step filling sequence, ladder is 400 rungs of state bits, move it to ST or SFC?

The valve reason, nearly always. They want the rung for XV107 and what's holding it off. They don't step through the sequence, they read which step it...

3 weeks ago
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RE: eWON Cosy 131 online in Talk2M but ping to the S7-1200 behind it times out

Pretty sure it's the gateway you mentioned now. Your laptop arrives through the tunnel from a 10.x address, the CPU gets the ping, and has no router t...

3 weeks ago
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RE: EtherNet/IP I/O drops 16#0204 about five minutes after every switch reboot

Querier none is your answer. Snooping listens for the IGMP joins and only forwards multicast to the ports that joined. Those joins get refreshed when ...

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

> A positioner with a dead spot gives you exactly this kind of slow cycle Stroked it this morning in 10 percent steps, feedback follows within a p...

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

Does the counter need the receiver pressure transducer into the PLC, or just the load signal? I think all we've got in there now is the load signal.

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

It isn't on the tab. Timeout is RPI times a multiplier, 4 by default, so 80 ms. On a bridge here the access point's own log showed retries and roams o...

3 weeks ago
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RE: S7-1500 diagnostics buffer "Distributed I/O: station failure" every few minutes

Redundancy cable with no ring protocol. Third one this year.

3 weeks ago
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RE: TIA V18 hardware catalog stops at V4.5, new S7-1200 CPU is firmware V4.6

Installed the HSP from a file, the lab laptop has no internet, restarted TIA, and V4.6 is in the catalog now. Change device version to V4.6, compiled,...

3 weeks ago
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