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Clarification about posting guidelines for vendors (being discussed in this thread): Please note that we encourage suppliers to participate on the forum. When replying to a thread, if you feel your company has a product that may solve the problem at hand, supply basic technological...

Read-only registers are called "Input Registers". Read-write registers are called "Holding Registers". The master can't even attempt to write to an input register, because there is no Modbus function code to do that. The protocol avoids the issue altogether by design, therefore the problem...

Certainly! Just connect the vacuum area to the low pressure side of the DP transmitter, and the liquid level to the high pressure side. This will work well unless the tank contents begins to boil under vacuum conditions - then the density changes and the level reading will be incorrect. Dick...

You can also look into PAS at http://www.pas.com/ who have an integrated Loop Monitoring & Alarm Management application. Subhrendu Malakar

You should be OK. Most of the AB 24 VDC Output modules are ground referenced (sourcing). Connect -24 V from your PLC DO supply to terminal 20 Connect the -24 of analog supply to terminal 55 They may be the same supply in which case you may leave the wire off terminal 20. You need to verify...

I saw a recent update to an old thread so I thought I'd point out the DeltaV Books On-line is available for v9.3 at: http://EasyDeltaV.com/bol/MasterBOL.htm Hope that helps for anyone coming upon this thread. Jim Cahill http://www.EmersonProcessXperts.com

Dear Phil, I saw your information on web site, I want to calculate feeder cable and its information is: length # 4124 feet voltage # 14.4 kv current on the primary of the transformer is # 182amp what will be the correct size of cable please provide me in detail calculation?

In addition to what has been said so far I would also suggest that you take a look at how your total control system will utuilize the drive data. The Schneider Electric Altivar 61/71 drives supports the Modbus TCP/IP IO Scanning functionality which makes it simple to implement the control...

Acutally Input registers 0x04 and input coils (discrete inputs) 0x02 are essentialy read only. You cannot write to them from a master as there is no function code to do so. For register that can be written to there is no way in the protocol specification to designate them as read only...

The basic concept of the two techniques is the same, the main difference is that FNICO is limited to use in zone 2 hazardous areas whereas FISCO can cover all zones. Please email me off-line if you would like me to email you some of our technical papers on the subject. Steve...

Hi Davis, Thanks for your reply, but I'm afraid my original post may have been misleading...the customer has not resigned themselves to using AB's CompactLogix, so much as they've insisted. In turn, I need to identify a 3-axes stepper solution that is compatible with AB's CompactLogix PLC &...