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.

New Here? Please read this important info!!!


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

Reply
 
Thread Tools Display Modes
Old March 6th, 2017, 07:07 PM   #1
arbj
Member
India

arbj is offline
 
Join Date: May 2011
Location: mrt
Posts: 55
Parallel ports in Allen Bradley PLC

Hi,

I am interested to know if PLCs have a parallel port implemented in them. The PLC is an allen bradley and has 8 digital input lines, a strobe, ready and acknowledge lines. The levels are all +24 VDC

I am curious to know if there is a standard implementation for this type of port. I have been asked to develop an interface for this, it will be very helpful if there are documentations available for the parallel port, I heard it being referred to as LPT port (printer port).

I can implement a parallel port interface easily in my design if documentation were available, but my problem how do I test this apart from using on the target PLC.

More specifically I am interested in knowing how can 16 bit data be strobed in using just 8 bits.

thanks
a
  Reply With Quote
Old March 6th, 2017, 07:16 PM   #2
rootboy
Lifetime Supporting Member
United States

rootboy is offline
 
rootboy's Avatar
 
Join Date: Jan 2004
Location: Tennessee
Posts: 1,362
Which AB PLC?
__________________
Just because you can doesn't mean that you should...
  Reply With Quote
Old March 6th, 2017, 08:19 PM   #3
Ken Roach
Lifetime Supporting Member + Moderator
United States

Ken Roach is offline
 
Ken Roach's Avatar
 
Join Date: Apr 2002
Location: Seattle, WA
Posts: 15,928
"Local Printer" LPT ports are from the era when Centronics dominated the dot-matrix printer business for IBM Personal Computers.

To my knowledge, no Allen-Bradley programmable controller has ever had a parallel data port on it.

There is no standard implementation of an LPT or parallel data port using ordinary 24V I/O. There's no "LPT library" or similar function.

In general, you need enough data lines to support your data size. If you want to do 16 bit data with one strobe, you need 16 data lines plus a strobe.
  Reply With Quote
Reply
Jump to Live PLC Question and Answer Forum

Bookmarks


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
allen bradley PLC software jairus LIVE PLC Questions And Answers 6 February 7th, 2015 11:55 AM
Allen Bradley PLC 2 Logix_Stef LIVE PLC Questions And Answers 9 November 20th, 2014 04:16 PM
Communication possibilities between Bachmann controller and Allen Bradley PLC KevinQ LIVE PLC Questions And Answers 0 October 16th, 2014 05:51 AM
Allen Bradley PLC for huge project mosama LIVE PLC Questions And Answers 4 November 22nd, 2011 01:14 AM
Allen Bradley ControlLogix 5000 PLC problem VoltSmith LIVE PLC Questions And Answers 22 January 16th, 2010 03:14 AM


All times are GMT -4. The time now is 03:19 PM.


.