Hi Guys, I am in the process of designing a machine monitoring system to collect data from CNC machine centers on the plant floor. Some of these machines are quite old and the specifications for each one will be different. I will be collecing the data by piggy backing existing I/O or in some cases Relay logic and sending the 24vdc signal back to the digital input of the PLC. I will require between 3 and 5 inputs per machine. The farthest run will be about 200 feet from the I/O. I would like to run a twisted pair type wire so that I dont have to run conduit to each machine. I was thinking about using CAT6 cable because there will be nominal current and the RJ-45 conectors would make the wireing visually astetic. Has anyone used data cable for a purpose such as this? Does anyone have any other ideas??? Thank you, Steve
Cableing Ideas
- Thread starter tacm
- Start date
widelto
Member
Hi Steve:
I do not know about your budget, but have you thought about installing a small plc like ML1000 from AB inside your CNC cabinet, wire all your inputs to the plc and then run ethernet cable from the plc up to an ethernet switch. This way you have all the info at the same time and you can use a kind of hmi in order to "see" yours CNC machines.
I do not know about your budget, but have you thought about installing a small plc like ML1000 from AB inside your CNC cabinet, wire all your inputs to the plc and then run ethernet cable from the plc up to an ethernet switch. This way you have all the info at the same time and you can use a kind of hmi in order to "see" yours CNC machines.
I do not have the budjet for a dedicated controler at each machine. I am going to use 1 micrlogix 1100 or 1500 for the I/O collection and then a Red Lion Data Station Plus to display the information via the web. Due to monitary concerns I cannot dedicate a controler to each machine......HOWEVER remote I/O at each machine might be a posibility if I could use a VERY VERY in expensive platform as I will be monitoring 25 machines to start, then will be adding another controler latter when I use all the avalable inputs(16 X 4 expantion cards) or (32 X 4 expantion cards if AB has a 32 channel card for the platform I use) :site:
LJBMatt
Member
If you can use a mlogix 1500 with a devicenet scanner you can use something like the Allen-Bradley CompactBlock LDX 8 or 16 input module in each cabinet. List price is around $250 each.
milldrone
Member
tacm,
Not exactly what you asked for, but take a look anyway
http://www.bannerengineering.com/en-US/products/sub/426
Not exactly what you asked for, but take a look anyway
http://www.bannerengineering.com/en-US/products/sub/426
LJBMatt
Member
I've never used twisted pair cables, only "SOO" (18awg) multiconductor cables in cable tray. Although for 25 machines even cabling is going to add up pretty quickly.
bulletin blues
Lifetime Supporting Member
Please do not not wire it with cat6 and a RJ45 connector. That would be WAY TOO EASY for someone to mistake as an "ethernet" cable and plug into their poor laptop...
rdrast
Lifetime Supporting Member
bulletin blues said:
QFT
Look into special designed cordsets, such as products from
http://www.turck-usa.com/Products/Connectivity/
or
http://www.connectorsales.com/mini.htm
LJBMatt
Member
I've used tons of quick connects in the past but if he has $3000 equip budget for 25 machines he'll spend close to that on just connectors nevermind the "SOO" cordsets.
bulletin blues
Lifetime Supporting Member
DB9 connectors from radio shack? That'll work. Just not the RJ45's. I gotta go to bed...
Wiring inputs using DC or AC on a Cat 5,6,5e,6e, or anyother communication cable is a bad idea.
1st they arent rated for current carrying and probibly arent rated for any significant voltage. Plus the wires become brittle as they are solid wire. This in my opinion would be a liability for fire / reliability.
Use a multiconductor cable or dont do the project as "eithernet" cable is for communication only.
1st they arent rated for current carrying and probibly arent rated for any significant voltage. Plus the wires become brittle as they are solid wire. This in my opinion would be a liability for fire / reliability.
Use a multiconductor cable or dont do the project as "eithernet" cable is for communication only.
I am not trying to be argumentative, and I do thank you all for your advice. 22AWG cat 6 cable is rated at .92 amps. It is also voltage rated, as it is telephone rated and the ringer on a telephone is approx. 75vac. Is there any other reason I am missing for not doing this??????????????????????????????????????????????????????????????????????????????????????????????????????Chris S said:
Similar Topics
I was just wondering if anyone had any experience with a VEGAPULS C 22 Radar sensor.
One of my customers got a cold call from one of there reps...
Hello Collegues ! I am here today looking for help, i recently started a magister in controls and automation. I was thinking in doing an automated...
We have AOIs for projects, which handle material dosing (by hand or by pipes and pumps), obviously they have comparison between setpoint and...
Wizards,
With all the extra downtime this year, I have started guiding the newer maint staff through a test cell build.
It has been quite...
This is a little off the PLC topic but hopefully within the wheelhouse of people here!
We have a client who has asked if on a future project they...