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Found 153 results

  1. Inverters on Profibus

    Hello, Tried to get some good and clear answers at the Siemens forum, decided to try here aswell. I have a setup with 12 G120C inverters and three gas burner units on a profibus line. If I unplug any of the devices will I of course get an error from the loaded OB. But, now and then can I lose the connection to two or more of the inverters without any notification. It seems that the communication is up and running, but the don't respond to any commands. The normally green LED on the inverters switch over to flashing red when they stop to respond. They will also show fault code 1910. I am using standard telegram 20, this is also set in the inverters parameter lists. Another funny thing is that the fault bit in the status word is always set. Even when the inverters don't hav any faults or alarms. ZSW looks like this (with or without response from the inverter): Bit 0 = 1 (Ready for switching on) Bit 1 = 1 (Ready for operation) Bit 2 = 0 (Running) Bit 3 = 1 (Fault) On all the time, even when there is no faults in the inverter Bit 4 = 0 (No coast down active) Bit 5 = 1 (No fast stop active) Bit 6 = 1 (Switching on inhibited active) Bit 7 = 0 (Alarm present) Bit 8 = 1 (Speed setpoint - actual value deviation within tolerance) Bit 9 = 0 (Control requested) Bit A = 0 (f or n comparison value reached) Bit B = 0 (I, M or P limit not reached) Bit C = 1 (Reserved) Bit D = 1 (No motor overtemperature alarm) Bit E = 0 (Direction of motor rotation) Bit F = 0 (Display CDS) Anything I might have missed or done wrong ?
  2. can anyone please provide me how to communicate between keithley controller 2182A(nano voltmeter) and fx 3G plc.aslo the programme & instruction & parameters..ASAP using RS-232 interface? i have used the instruction as show in the attachment.
  3. Hi everyone, my client has a Direct Communication network consisting of Allen bradley 1772-SD2 (PLC2) and 1771-DCM modules. I need to upgrade one of the adapter node from 1771-DCM to newer hardware. My client is insists to KEEP the 1772-SD2 scanner as it is. So essentially I need a recent hardware to replace 1771-DCM and work with 1772-SD2. Do I have any option to upgrading this node with recent generation solutions?