J. B. Jennings

From the Micrologix 1000 Manual:Publication 1761-6.3 July 1998 "One difference between Up Counters and Bidirectional Counters is that for Bidirectional Counters the accumulator and preset values are not changed by the high-speed counter when the presets are reached. The RAC and HSL instructions must be used for this function." Hope this helps

IIRC, with modbus, you can only communicate with 1 device at a time. My suggestion is to trigger the start of the first drive, when your comm port is done with that command, start the next drive and so on... Hope this helps.

The connection is shipped as such to facilitate the use of multiple cables or a single cable with the proper size conductors. This gives the end user many more options than requiring a specific cable to accomplish this interconnection.

Precisely the reason to read the manuals online (or printed) before ordering the parts. Sorry, looks like you need to find some other way to communicate with your scale.

One last round of questions. When you have zero flow, what is the output of the device? What are you reading at the input card? What raw value are you seeing for the input card? (Hint: this needs to be your raw input value and your scaled input value should therefore be zero). I agree with Okie on checking the values at zero flow and full sustainable flow. Use the same command, just edit the values for scaled min and max and raw min and max to what you find from your testing. It might be a good idea to have some other type of flow meter available since you are in essence calibrating this one. Hope this helps.

Are you sure the meter is supposed to indicate 0-70 GPM? If you are using it in 1 1/4" pipe the meter manual states max current at a flow of 67.1 GPM. With that number-- 67.1GPM *60 min/hr * 24 hr/day =96624 Gal/Day 70 GPM * 60 min/hr * 24 hr/day = 100800 Gal/Day Thus at full scale your error is 4176 Gal/Day. I would check the manual for the meter and set the scaled max to the max flow indicated for your pipe size. The input min in the scaling looks a little small also. Hope this helps.

Some software may allow it. Think about it from a troubleshooting standpoint. For example: I have 5 ladder rungs, scattered throughout a program, that turn on my fault indicator. Which rung is currently turning it on? Why is it showing off while browsing the program online? Enough said. Yes, it is very bad programming practice to want coil outputs to appear numerous times. ---- Stepping down from soapbox now.

What is the model/part number of the Microscan Hawk? I have used up to 4 of these in a system in the past with no problem, even with concurrent readings. 24 may be a stretch. How often would more than one scanner be processing (scanning) a barcode? What type of application are you using these sensors? More Information==Better Answers

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I personally prefer MTW when it comes to connecting to terminal strips, but for field wiring we typically use THHN (its cheaper????).

I have attached a revision of your code, which should only allow both pumps to run when the level is above 40.0 for 5 or more seconds. I did not take into account for what happens when the level drops below 40 (right now lag pump will shut off, lead pump will run until level reaches 18). Any questions please ask. Any suggestions let me know. Hope this helps some. ALTERNATOR.pdf

I know there are other systems available, but my personal experience with Siemens and IFM Efector ASi bus interfaces to a Woodhead card in AB SLC racks has been nothing but positive.

Unless you can get your analog cards for less than $139, you could get this Click PLC from Automation Direct, free software and a rather inexpensive programming cable. The biggest limit I see with using this system is that currently there are no add-on analog I/O and the only bases with analog I/O have DC inputs and outputs.

Sounds like to ensure bleed off, you could add a second solenoid downstream of the first solenoid and open it to relieve the excess pressure.

Crossing at 90° angles is what I prefer when possible. As long as the frequency is the same between AC power, and 120VAC controls, you should be able to run them parallel. We only run our shielded DC controls in separate conduit and try to minimize crossing of the DC and AC lines. Good luck.