Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

MicroLogix 1200 communication to laptop

Status
Not open for further replies.
thebard3

thebard3

Chemical
Joined
May 4, 2018
Messages
787
Location
US
All,
At a customer site yesterday, they have several MicroLogix 1200 controllers. Some of the controllers have 2 communication ports, 2 of them have only one on the front. Using RSLinx Classic and a PM02 (series B) cable, I was able to connect to each of the ports on the controllers with 2 ports. They both appear as DH485 protocol. I was unable to establish communication with the controllers that have only one port. I attempted deleting the driver and recreating it numerous times, and get a timeout message using autoconfigure. As I had no trouble connecting to the controllers with 2 ports, I know I am using the correct cable and the correct port configuration, unless I need a different cable for the (presumably) older controllers. Any ideas?

Brad Waybright

It's all okay as long as it's okay.
 
Sort by date Sort by votes
It can depend on your rslinx version too. Maybe your rslinx version is not recent enough. But since its older controllers maybe there is a different driver selection that you need to use.
 
Upvote 0 Downvote
Thanks controlsdude, but I learned that lesson the hard way. I always keep the latest version of LINX. I just can't imagine what is different about the ports on the 2 controllers.

Brad Waybright

It's all okay as long as it's okay.
 
Upvote 0 Downvote
Single port MicroLogix controllers can be set for multiple protocols, usually DH485 or DF1, Processors with the second port, the Program/HMI port only supports DF1 comms, with fixed baud rate and other parameters

A PM-02 cable is a RS232 cable for DF1 comms, if the port is set for DH485, then you need a converter, like a 1747-PIC (serial) or UIC (USB), there are also some aftermarket DH485 comm adaptors that work quite well too.

If the single port ML1200 will not communicate with your laptop and a serial cable, it may be setup for DH485, in that case you can press and hold the DCOMM button under the cover, and the comms will revert to the default DF1 setup for the port, this link discuss's the issue,
MikeL.
 
Upvote 0 Downvote
Thanks, Mike. I searched that forum and didn't find that post. I missed part of the port configuration, when I auto-configured and connected to the 2-port units, the driver showed up as DH-1 RS485 which I thought was wierd. Also didn't know about the DCOMM button. I was there after hours and didn't have internet access either. Unfortunately the jobsite is 200 miles from me so it's not something I can go back and test. I think our customer is going to buy the 2 port controllers anyway, as we are replacing the old PanelView HMIs with PanelView Plus, and with a single port it's necessary to disconnect the HMI to work on the machine. With the new controller and HMI they'll have 6 identical machines.

I appreciate the help.

Brad Waybright

It's all okay as long as it's okay.
 
Upvote 0 Downvote
Revisited the site yesterday. The DCOM button worked perfectly and I was able to swap out 2 old panelviews on DH485 with PVPlus on DF1

Brad Waybright

It's all okay as long as it's okay.
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

somoy
  • Locked
  • Question Question
Mwm CPU p communication with operating terminal
Replies
0
Views
768
somoy
somoy
mboliver
  • Locked
  • Question Question
Micrologix 1200 communication using rs232 connect in df- router
Replies
1
Views
386
thebard3
thebard3
Azam1985
  • Locked
  • Question Question
how to make Wibu dongle backup
Replies
0
Views
644
Azam1985
Azam1985
Lucianmwm
  • Locked
  • Question Question
Power and temperature oscillation, between Power range 55% to 75%, CAT CG260/16
Replies
0
Views
731
Lucianmwm
Lucianmwm
Kevin8686
  • Locked
  • Question Question
Sematic HMI 1st Generation KTP400 Basic Mono NP Migration to 2nd Generation KTP 400 Basic.
Replies
1
Views
805
Crowbar1
Crowbar1

Part and Inventory Search

Sponsor

Back
Top