mr_sleepy
Member
[FONT="]Hi all. Fridays a bad day to start anything but here goes. I have an odd problem with a profinet network. All the devices are configured and operating correctly as far as I can take them at this moment in time. We have several 3rd party devices and they appear to be operating correctly also, the plc is happy that they exist, can exchange data etc. Recently I found when checking that some of the data is corrupted when it appears in the plc. I found this because the 3rd party devices use a webserver so you can view the pre-transport data to check it against what you receive. According to the device manual the pre-transport data is what I expect (status bits match device leds, readouts etc), but as soon as the plc gets it, the values are wrong. I will point out that they are not all wrong. The 3rd party device is an anybus abcc-prt from hms controls. When I talked to the vendor of the 3rd party device he said if the webserver shows the correct data then his side is working correctly i.e modbus to the daughter board. If I talk to siemens or hms they say if the plc recognises the device and talks to it then whats the problem. Im struggling to work out which direction to point my finger in.
I have a crude picture of the network arrangement as follows
[/FONT] The devices highlighted in red show the relative position of those devices in the network. The cables to those (and the scalance) are routed far away from the noisy ac side of the panel. The plc is an s7300 cpu315-2pn/dp configured using the step7 v5.5 sp2 and the gsd is obviously correct or the device wouldn't get past the handshaking part of the profinet bootstrapping mechanism.
Hopefully someone will look at this and say "OH NO, you cant wire x,y,z like that", who knows. If anyone can help me figure out where to start looking for this then I would be greatful.
Thanks in advance.
I have a crude picture of the network arrangement as follows
[/FONT] The devices highlighted in red show the relative position of those devices in the network. The cables to those (and the scalance) are routed far away from the noisy ac side of the panel. The plc is an s7300 cpu315-2pn/dp configured using the step7 v5.5 sp2 and the gsd is obviously correct or the device wouldn't get past the handshaking part of the profinet bootstrapping mechanism.
Hopefully someone will look at this and say "OH NO, you cant wire x,y,z like that", who knows. If anyone can help me figure out where to start looking for this then I would be greatful.
Thanks in advance.