Hi guys,
I have a problem, a Compact logix PLC with 20 node point all within 20 metres, 121 ohm resistor at each end, network works fine.
Now when a VSD starts (seperate to the devicenet network), I get the error 91 on devicenet scanner. Stop the drive, a toggle of the 24VDC devicenet supply and all ok again until the next time.
I have checked connections. I read the rockwell devicenet manual and it said that the 0V of the devicenet 24VDC supply and the devicenet shield must be connected to earth (only one connection and close to centre of the network). There was to earth connection to the ground or the 0V. I connected these and the same occurs when the drive starts. I also checked the resisters.
I dont know what else to do, the signal cables comming into the panel are shielded to earth at one end,
The nodes are compact block analogue/digital inputs/outputs and Danfoss VFD drives (the starting of these donesn't cause and devicenet errors)
Any help appreciated as stuck!!!
Thanks
Matt
I have a problem, a Compact logix PLC with 20 node point all within 20 metres, 121 ohm resistor at each end, network works fine.
Now when a VSD starts (seperate to the devicenet network), I get the error 91 on devicenet scanner. Stop the drive, a toggle of the 24VDC devicenet supply and all ok again until the next time.
I have checked connections. I read the rockwell devicenet manual and it said that the 0V of the devicenet 24VDC supply and the devicenet shield must be connected to earth (only one connection and close to centre of the network). There was to earth connection to the ground or the 0V. I connected these and the same occurs when the drive starts. I also checked the resisters.
I dont know what else to do, the signal cables comming into the panel are shielded to earth at one end,
The nodes are compact block analogue/digital inputs/outputs and Danfoss VFD drives (the starting of these donesn't cause and devicenet errors)
Any help appreciated as stuck!!!
Thanks
Matt