Communicating with PLC5 using 1761-CBL-PM02

[mutabi 0]

Hey guys, I am trying to communicate with PLC 5 processors using the 1761-CBL-PM02 adaptor with the USB 1747-CP3 cable. However no matter what I do I cannot see any PLC5's. I can use just the cable and see SLCs just fine. I can also see Micrologixs. But have yet to be able to see any PLC 5's in RSLinx. Auto Configure works fine with the micrologix, but will not work when I am hooked up to a PLC 5. According to the website the adaptor should work with PLC 5s. "Supports Micrologix and PLC5 with adapter 9 pin Female connector on PLC side. (sold separately)" I assume the adaptor they are talking about is indeed the 1761-CBL-PM02 Are there any tricks to getting it working? Making a stupid mistake maybe? I have checked the com port that the USB cable uses (com 4) so that is set correctly in RSLinx. Thanks for any help in advance. John

[Chris Elston 79]

John, For PLC5, you generally need a CP3 cable and a DB-9 to DB-25 adapter, you'll program through the 25 pin port. If you have the USB-CP3 cable, all you need is a DB-9 to DB-25. We have a few of those. Please PM me I might be able to hook you up.

[mutabi 0]

Thanks for the response Chris. We are gonna look around and see if we have any DB-9 to DB-25 connectors. If not I will get with you. Would a male DB9 to DIN connector work(DH 485?) or am I confusing protocols? thanks for your help.

[Mickey 71]

Which PLC5 do you have (PLC5/??) What port are you trying to use on the PLC5? FYI PLC5"s do not support DH485 and the round port on your PLC5 is a DH+ port. Edited 23 Jun 2010 by Mickey

[Ken Roach 194]

You've made two incorrect assumptions, both of which are very understandable. A-B made compromises decades ago between using commercially available physical plug hardware and keeping proprietary network connections from being connected to general-purpose computers. PLC-5 "Classic" controllers (5/15, 5/25) have a 9-pin D-shell connector on the front that supports "PCL", a subset of Data Highway Plus. This often is confused for RS-232 because it is a DB9 connector. PLC-5 "Enhanced" controllers (5/20, 5/40, 5/80, etc, including ControlNet and Ethernet models) have a 25-pin RS-232/422 serial port. The purpose-specific cable is a 1784-CP10, but it is common to use a general-purpose 9/25 converter and a 1747-CP3 or 1756-CP3 null modem cable. This is an ordinary RS-232 port, built when the IBM XT reigned supreme in the PC world. The round 8-pin "mini-DIN8" connector above Channel 1A of the DH+ port on Enhanced PLC-5 and on SLC-5/04 controllers is a DH+ local access port. Despite its similar appearance to PS-2, AppleTalk, or the serial port on MicroLogix controllers, it is only used for DH+. This sort of port confusion is common in the industrial world; it's not just Allen-Bradley. I have a device in front of me right now with five DB9 ports: RS-232, fieldbus, CANbus, current-loop, and I/O.