You are not registered yet. Please click here to register!

plc storereviewsdownloads
This board is for PLC Related Q&A ONLY. Please DON'T use it for advertising, etc.
Try our online PLC Simulator- FREE.  Click here now to try it.

---------->>>>>Get FREE PLC Programming Tips

New Here? Please read this important info!!!

Go Back - Interactive Q & A > - Interactive Q & A > LIVE PLC Questions And Answers

PLC training tools sale

Thread Tools Display Modes
Old September 19th, 2005, 04:22 PM   #1
United States

Drudawgshu is offline
Join Date: Sep 2005
Location: Indiana
Posts: 1
PLC network

Im designing a conveyor system that contains 27 lines. Each line has 10 120Vac inputs and 20 120vac outputs. I would each line to have its own panel of I/O and connect all lines to a SLC 04 over a network configuration. Should I use the flex I/O? over a devicenet network? controlnet network? I must use the SLC 04 processor, Any ideas of the best way to communicate to this I/O??

any suggestions would be appreciated.
  Reply With Quote
Old September 20th, 2005, 10:55 AM   #2
Lifetime Supporting Member
United States

MartB is offline
MartB's Avatar
Join Date: Jun 2005
Location: Pinellas Park, FL
Posts: 684
The choice of remote I/O is usually a physical one. Is it pratical to run long mulitple wire lengths to reach conveyor motors, sensors, etc (I'm making assumptions here).
Communication choices are often based on speed. Is it neccessary to have high speed communications ?
As for 120Vac inputs and outputs, would it be more pratical/safe to have relays operating these? and simply supply I/O to banks of relays in remote panels via devicenet (Just thinking out loud really)?

Maybe more detail would make your predicament easier to understand.
Mart B

Never underestimate the predictability of stupidity!
  Reply With Quote
Old September 20th, 2005, 11:35 AM   #3
Lifetime Supporting Member
United States

OkiePC is offline
OkiePC's Avatar
Join Date: Mar 2005
Location: ENE of Nowhere Oklahoma
Posts: 10,130
You have to choose a network type and and I/O type.

Your main choices for a network type with a 5/04 are going to be RIO, C-NET, or Devicenet. I have zero experience with devicenet, but lots with RIO. It is very reliable, fairly easy to configure, and fast enough for most applications. Controlnet is much more difficult to work with, but very fast. For controlnet, you will need RSNetworx for Controlnet software, tools to make good BNC connections, and a lot of little parts and pieces to put it all together. RIO is extremely easy to work with. One 3 wire cable daisy chained from the scanner to all the adapters with terminating resistors at the end links, a little configuration and you're done.

With DNET you can use point i/o, flex i/o, or compact i/o. With RIO you can use block i/o, flex i/o, or slc i/o. I have never used compact i/o. I don't particularly like flex I/O. I do like SLC i/o, and have used block I/O with no problems.

Block I/O has a built in comm adapter and is available with both inputs and outputs, but for 120vac outputs, the most you can get in a combo unit is 16 outputs. (You can get 32 outputs in a single unit, and 32 inputs in another single unit) If you used 24VDC for control, you could use a single unit for each station with 32 inputs and 32 outputs. Block I/O has removable terminal blocks for easy replacement, but with 120vac control power, you'd have two of them per panel. I thinks it's more rugged than flex i/o, but takes A little more space:
(1)1791-32B0 (or 16A0)

Putting a four slot SLC i/o panel in each station will cost more but take less space than two block i/o modules:
(1)1746-A4 (Chassis)
(1)1746-P2 (Power Supply)

I would weigh (heavily) into the decision what types of communications and i/o are already in use in the plant.
  Reply With Quote
Jump to Live PLC Question and Answer Forum


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Topics
Thread Thread Starter Forum Replies Last Post
PLC Programming.... or what... cars & motorcycles? Terry Woods LIVE PLC Questions And Answers 57 September 26th, 2013 10:06 PM
PC to PLC Protocol TheRixta LIVE PLC Questions And Answers 13 December 17th, 2008 12:56 PM
Modbus RS485 or Ethernet for 27 plc network JimR LIVE PLC Questions And Answers 2 March 10th, 2005 08:51 AM
use plc with others pc in network tomkens LIVE PLC Questions And Answers 3 March 21st, 2004 01:46 PM
the answer to which PLC is the best... ganutenator LIVE PLC Questions And Answers 12 December 21st, 2002 11:00 PM

All times are GMT -5. The time now is 06:51 PM.