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larsdk
@larsdk
New Member
Joined: Dec 15, 2024
Last seen: Sep 19, 2026
Topics: 1 / Replies: 6
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RE: ET 200SP F-DQ 4x24VDC PM read-back error the moment it switches a contactor coil

There's your fault, and it isn't the coil. That module is PM switching. It switches the P side and the M side of the load, and it reads both back. You...

19 minutes ago
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RE: S7-1500F F-DI channel stays at substitute value 0 after the fault is gone

Both your 24VDC F-DI modules are fine then, still on TIA V17. ACK_REQ TRUE means the channel's repaired and waiting to be let back in. What writes ACK...

1 hour ago
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RE: ET 200SP F-DI 8x24VDC HF passivates a guard door switch with a discrepancy error

What's the discrepancy time in the channel parameters for that pair, and what exactly is the switch, part number? I'm not guessing at a time without k...

1 hour ago
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RE: Two hundred low flow and low pressure alarms on every plant startup, operators ack blind

Pump alarms are done. Running bit AND the 30000ms TON in the In condition of each ALMD, filters next week at three minutes. This morning's restart aft...

2 hours ago
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RE: SISTEMA gives PL c for a Cat 3 door interlock on an S7-1500F, needed PL d

What DC did you enter for the output subsystem, and how are the contactors monitored? Is there a feedback loop from the contactors back into an F-DI, ...

2 hours ago
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RE: Two hundred low flow and low pressure alarms on every plant startup, operators ack blind

Honestly, maybe 20. The rest are "that pump isn't running" in different words. The radio link to the north tank drops a couple of times a week as well...

3 days ago