Slc500 1747-l552c 5/05

I have a SLC processor communicating over ethernet and was wondering if it is possible to add a PLC 5 to the network using DH+/DH-485 through chanel 0 on the slc processor card? Thanks for anyone that can help.

Ron

If you want the SLC5/05 and your PLC5 on the same Ethernet network you might want to consider using a 1761-NET-ENI to connect the PLC5's serial port the the Ethernet network.

Hi Ron,

Depending on the PLC5 you have... if it has a serial port then Mickey may have the best option, if not (only DH) then the only way I know how is by using a DH+ to Ethernet bridge, this runs about 2K USD, can you change out the PLC5 to a Ethernet PLC5 ? not sure what would be cheaper, if its a L20 the you can find them for about 1500, a L40e/e is around 2k also (used)

I think you are asking for using it as a pass through and I just dont think you can

Best regards
Mark

Mickey said:

If you want the SLC5/05 and your PLC5 on the same Ethernet network you might want to consider using a 1761-NET-ENI to connect the PLC5's serial port the the Ethernet network.

Click to expand...

As Mickey suggested or if the slot directly to the right of the processor is not used, a 1785-ENET (PLC5 Ethernet side card) would also be an option. This would then be communication port channel 3A.

You can, in theory, "Pass through" the SLC-5/05 Ethernet port to the SLC-5/05 serial port and then through to the PLC-5 serial port.

The only serial protocol that will work for that connection is DF1 Full Duplex.

Ethernet/DF1 passthrough is a little tricky to set up in the SLC-5/05; you need to enter the IP address of your computer in a host list using RSLogix 500.

Because the SLC has a single-threaded processor and no separate communications processor, it has to forward every single packet from Channel 1 to Channel 0 during its housekeeping cycle. This connection will be slow if the SLC is loaded down with ordinary automation tasks.

You will get far better results with a dedicated Ethernet/Serial interface, an Ethernet sidecar, or an Ethernet/DH+ bridge.

Just communicate using DF-1 over the serial ports. Buy a couple of cheap terminal servers to use existing Ethernet lines. A single MSG instruction for each comm (1 read/1 write) will do the trick.

Thanks everyone. I think I will just use a 1761-NET-ENI as it sounds like the easiest option.

Wait until you try to use it