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finn21
@finn21
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Joined: Oct 6, 2025
Last seen: Sep 19, 2026
Topics: 3 / Replies: 11
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RE: 1734-IB8S door switch input short to test output every time the door closes

Meter across the two panel wires with the switch disconnected reads 0.3 ohms so they are connected somewhere, but the old switch worked for years on t...

25 minutes ago
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RE: TIA V17 can't find the S7-1500, device not accessible, but ping works

Cable's in the USB dongle, it shows up as "ASIX AX88179 USB 3.0 to Gigabit Ethernet". Direct to the CPU, no switch. Route print says 192.168.10.0 goes...

52 minutes ago
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RE: MSG read works for one tag and errors for another on the same target controller

What's the External Access column for? I've never touched it. Not sure I get it.

1 hour ago
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RE: RSLinx shows red X on 1756-EN2T in RSWho, ping works from the same laptop

so it's like the laptop shouting in one room and the PLC being in the next room with the door shut? Ok.

6 hours ago
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RE: S7-1500 OPC UA server connects, UaExpert shows no DB variables

Is that the "Accessible from HMI" tick box thing? So if I've understood it, the DB has to be marked accessible, not just exist in the project?

7 hours ago
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RE: PowerFlex 525 16#0116 electronic keying mismatch after drive swap

So if I'm reading this right, the PLC expects the exact drive it was set up with and the new one's a different version, so it says no. Is that it?

8 hours ago
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RE: GuardLogix DCS discrepancy fault on one E-stop about once a week, button tests fine

Sorry, so the discrepancy time is how long the two contacts are allowed to disagree before it faults? So one contact is opening and the other is not, ...

9 hours ago
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RE: MicroLogix 1400 CTU counts two or three per bag from a photoeye, count 15 percent high

Could the scan be too fast and the PLC counting the same bag on two scans? We had something like that on a line at college, or I think we did.

15 hours ago
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RE: 2-wire prox keeps an S7-1200 input on with nothing in front of it

ok. So the sensor is fine and the input is fine, they just don't suit each other, and the resistor gives that leakage somewhere to go so the input see...

20 hours ago
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RE: 1734-IB8S door switch input short to test output every time the door closes

T0 for channel 0 and T1 for channel 1, that part I did not touch. In the JB it is a little strip with three terminals. Two channel wires come in from ...

3 days ago
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RE: 2-wire prox keeps an S7-1200 input on with nothing in front of it

Sensor datasheet says leakage current 1.5mA max. CPU manual table says 0 state max 5VDC at 1mA, 1 state min 15VDC at 2.5mA, though I'm not sure I'm on...

3 days ago