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dieter_k
@dieter_k
Eminent Member
Joined: Nov 22, 2024
Last seen: Sep 22, 2026
Topics: 0 / Replies: 20
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RE: S7-1200 slot 3 SM 1223 faults after a download, rest of the rack runs

Upload first on any site you did not commission yourself.

2 weeks ago
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RE: S7-1200 slot 3 SM 1223 faults after a download, rest of the rack runs

Then look at the bus connector. On a 1200 the modules clip together and the connector on the left neighbour carries slot 3. A half seated clip gives y...

3 weeks ago
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RE: STEP 7 V5.5 says object not found with 256:31 and I cannot find that number anywhere

Work off a local copy, not the share. That clears half of these.

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

Yellow MAINT after someone adds a switch. We get that call twice a year.

3 weeks ago
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RE: DeviceNet 1747-SDN, nodes at the far end of a 300 m trunk drop at 250 kbps

Nine years past the limit and it ran. I wouldn't have believed it.

3 weeks ago
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RE: PROFIsafe F-DI passivates with F-monitoring time exceeded since the MRP ring went in

Then it's both, and only one of them is the safety fix. Replace the patch lead, yes. But the F-monitoring time has to survive a ring reconfiguration o...

3 weeks ago
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RE: New ET 200SP station, IM 155-6 red ERROR, every module shows missing

Every first ET 200SP. Mine hid in the packaging for a day.

3 weeks ago
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RE: PROFIBUS DP at 1.5 Mbit/s over a 300 m segment, far slaves drop with BF flashing

It's the signal, not the cable. Attenuation and edge rounding both grow with length, and the faster the rate the shorter each bit, so there's less tim...

3 weeks ago
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RE: PROFIBUS DP at 1.5 Mbit/s over a 300 m segment, far slaves drop with BF flashing

300 m at 1.5 Mbit/s is the whole problem. Type A cable per segment: 1200 m up to 93.75 kbit/s, 1000 m at 187.5, 400 m at 500 kbit/s, 200 m at 1.5 Mbit...

3 weeks ago
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RE: PROFIsafe F-DI passivates with F-monitoring time exceeded since the MRP ring went in

Ring reconfiguration time. Standard MRP is the 200 ms class for up to 50 devices, fewer devices is faster in practice but 200 is the figure you design...

3 weeks ago
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RE: TwinCAT 3 EtherCAT slaves drop to SAFEOP, WcState 1 and lost frames climbing

Slaves 1 to 13 fine, 14 onward bad. Something sits between 13 and 14. How long is the cable between those two, and what sort of cable is it?

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

Did the integrator draw the port to port topology in the project, the topology view with lines between the ports? If he did, the CPU checks its neighb...

3 weeks ago
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RE: S7-300 stops whenever a PROFIBUS slave drops, OB 86 not loaded

Add OB86, OB82, OB122 and OB85 to the project, empty is enough, and download them. The CPU then logs the station failure and keeps running. Inputs fro...

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

MRP is the ring protocol. Your line is now a physical ring with no ring protocol, so it is just a loop. Frames go round, devices choke, one drops, com...

3 weeks ago
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