Alan Case
Lifetime Supporting Member
Hi.
Does anyone here know the advantages of using shielded cat 5/6 cables in lieu of unshielded when joining together Rockwell Powerflex 753 VFDs in a Device Level Ring. (DLR)
The VFDs are fitted with the EN2TR Ethernet cards that have 3 Ethernet ports.
The 2 front ports are for a 753 VFD and the back port is reserved for a 755 VFD.
My DLR utilises the 2 front ports.
Now for the strange thing. The 2 front ports are metal shielded but the metal on the port has no connection to any earth point nor to the other port.
The rear port which also has metal shielding does have a connection to the frame of the drive. (test with an ohm meter)
I am trying to see a reason for using shielded cable if the shielding is not grounded anywhere or continuous through all the cat 6 cables.
Regards Alan Case
Does anyone here know the advantages of using shielded cat 5/6 cables in lieu of unshielded when joining together Rockwell Powerflex 753 VFDs in a Device Level Ring. (DLR)
The VFDs are fitted with the EN2TR Ethernet cards that have 3 Ethernet ports.
The 2 front ports are for a 753 VFD and the back port is reserved for a 755 VFD.
My DLR utilises the 2 front ports.
Now for the strange thing. The 2 front ports are metal shielded but the metal on the port has no connection to any earth point nor to the other port.
The rear port which also has metal shielding does have a connection to the frame of the drive. (test with an ohm meter)
I am trying to see a reason for using shielded cable if the shielding is not grounded anywhere or continuous through all the cat 6 cables.
Regards Alan Case