Hi All,
Looking for some advice in interpreting ProfiTrace Scope images.
The PROFIBUS network topology of the machine was as follows;
PLC(2) <-> ET200(3) <-> SEW_GW(50) <-> SEW_SERVO(55) <-> SEW_SERVO(56) <-> SEW_GW(51) <-> SEW_GW(52) <-> SEW_GW(53) <-> SEW_VFD(57) <-> SEW_VFD(58) <-> SEW_VFD(59) <-> ET200(7) <-> ET200(10) <-> TR Elec Encoder(70) <-> TR Elec Encoder(71) <-> TR Elec Encoder(72) <-> TR Elec Encoder(73) <-> TR Elec Encoder(74) <-> TR Elec Encoder(75) <-> TR Elec Encoder(76) <-> TR Elec Encoder(77) <-> TR Elec Encoder(78) <-> ET200(11) <-> TR Elec Encoder(79) <-> TR Elec Encoder(80) <-> ET200(12) <-> ET200(13) <-> ET200(16) <-> ET200(18) <-> TR Elec Encoder(81) <-> TR Elec Encoder(82) <-> TR Elec Encoder(83) <-> TR Elec Encoder(84) <-> ET200(14) <-> ET200(15)
Baud is 3Mbps. We were having constant bus failures all from station 12 onwards. All the interface modules and connectors for the ET200's were replaced as we chased bus fault lights around. All the wiring from station 13 on has been replaced.
We noted that the length of the run was probably greater than 100m and also that there were more than 32 stations on the the network. We then decided to split the network using a repeater from Station 13 on inclusive. The repeater was installed immediately after station 7. Terminator resistors for station 12, Repeater side 2 turned on.
This allowed the machine to run but still on the odd occasion would fault out with a bus fault. Generally the bus fault was from the new segment that had been created (Stn13-Stn15).
We purchased a ProfiTrace tool. Connecting to the PLC DB9 I get the following (see PDF or ProfiTrace file https://www.dropbox.com/sh/sjson41m2lgkvfn/AAAxzjgYgHVrhMJlYhCtXr3ia?dl=0 as fle too big) I therefore assume I am dealing with a wire break. Unless all I am looking at is the reflection from the stub connection.
What is also odd is that between station 71 and 72 there is a large drop in quality. We have replaced both the encoder back plates and cable between the two but this has not improved the quality between the two devices. station 72 and on the amplitude and quality of the signal is very degraded.
Now I am looking for some advice as to what the ProfiTrace tool data is telling me and wether my conclusion is correct?
All help appreciated.
Looking for some advice in interpreting ProfiTrace Scope images.
The PROFIBUS network topology of the machine was as follows;
PLC(2) <-> ET200(3) <-> SEW_GW(50) <-> SEW_SERVO(55) <-> SEW_SERVO(56) <-> SEW_GW(51) <-> SEW_GW(52) <-> SEW_GW(53) <-> SEW_VFD(57) <-> SEW_VFD(58) <-> SEW_VFD(59) <-> ET200(7) <-> ET200(10) <-> TR Elec Encoder(70) <-> TR Elec Encoder(71) <-> TR Elec Encoder(72) <-> TR Elec Encoder(73) <-> TR Elec Encoder(74) <-> TR Elec Encoder(75) <-> TR Elec Encoder(76) <-> TR Elec Encoder(77) <-> TR Elec Encoder(78) <-> ET200(11) <-> TR Elec Encoder(79) <-> TR Elec Encoder(80) <-> ET200(12) <-> ET200(13) <-> ET200(16) <-> ET200(18) <-> TR Elec Encoder(81) <-> TR Elec Encoder(82) <-> TR Elec Encoder(83) <-> TR Elec Encoder(84) <-> ET200(14) <-> ET200(15)
Baud is 3Mbps. We were having constant bus failures all from station 12 onwards. All the interface modules and connectors for the ET200's were replaced as we chased bus fault lights around. All the wiring from station 13 on has been replaced.
We noted that the length of the run was probably greater than 100m and also that there were more than 32 stations on the the network. We then decided to split the network using a repeater from Station 13 on inclusive. The repeater was installed immediately after station 7. Terminator resistors for station 12, Repeater side 2 turned on.
This allowed the machine to run but still on the odd occasion would fault out with a bus fault. Generally the bus fault was from the new segment that had been created (Stn13-Stn15).
We purchased a ProfiTrace tool. Connecting to the PLC DB9 I get the following (see PDF or ProfiTrace file https://www.dropbox.com/sh/sjson41m2lgkvfn/AAAxzjgYgHVrhMJlYhCtXr3ia?dl=0 as fle too big) I therefore assume I am dealing with a wire break. Unless all I am looking at is the reflection from the stub connection.
What is also odd is that between station 71 and 72 there is a large drop in quality. We have replaced both the encoder back plates and cable between the two but this has not improved the quality between the two devices. station 72 and on the amplitude and quality of the signal is very degraded.
Now I am looking for some advice as to what the ProfiTrace tool data is telling me and wether my conclusion is correct?
All help appreciated.