OZEE said:What PLCs are being used in _______________ applications? (You fill in the blank with whatever application you desire)
Any specific application is not limited to one particular PLC.
It kind of depends on local resources and preferences. I'm sure if you examine coal mining world wide, you'll find every major brand of PLC in use somewhere.
HenkieD said:Depends of customers preferences.
Some use ABB (Linkmann), actually a lot use it. And of course Siemens (PCS7 with or without necessarry addons).
Sure ther are more but these once are quit common, at least in the places where I'v been.
Best Regards
Henk
kellian said:Any brand of PLC can be used inside a flame proof enclosure (we use AB PLC5,SLC500,CLX) in a various peices of equipment. The "trick" is to have a barrier which limits power between the plc and the hazardous area. such as those made by MTL, Pepplr & fuchs.
Use design engineers that know this type of equipment and inherient dangers.
HenkieD said:I fully agree with Kellian, however you have to take a few things in considaration when using barriers. A barrier has a very low signal on both sides of it. Just be carefull when choosing io cards. Two weeks ago I did an unplanned S5 to S7 upgrade off an ESD system (Emergency Shut Down) on a Chemical plant. (Normal) Analogue plc cards sometimes can pull down the barrier... in this case you need amplifiers (like the Phoenix Contact ones) to get a proper reading.
Just be aware of this.
Yes, but what if you have to maintain the PLC that is situated in such an explosion-proof enclosure ?Any brand of PLC can be used inside a flame proof enclosure
No, I think it was nothing more than a wireless access point connected to the Control Logix Ethernet. This was about 5 years back.Sliver said:Peter,
Do you remember the manufacturer of the wireless equipment you were talking about? We are playing with some ProSoft units right now with good results.