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About Emach

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  1. Hello, I have a Windows 7 Pro SP 1 machine running RSLinx Classic Lite CPR 9 SR 3 and RSLogix 500 8.30.01 (CPR 9). I have a 1784-U2DHP (sorry the label w/ the HW revision got peeled off) which I use to talk to a 1747-L541 5/04 processor. I can see the processor in Linx via the -U2DHP but when I launch "system comms" in Logix I cannot access the driver... The U2DHP appears in network list on the right hand list but it doesn't appear on the left side. When I double click on the -U2DHP entry in the available networks list, nothing happens... Grr. I've tried rebooting the laptop and I do see the 5/04 via the U2DHP in Linx... Problem is I have gone online w/ this laptop, U2DHP and SLC in the last two weeks without an issue. I'm not aware of any changes to Linx or Logix500 since that time. I use the same version of Linx to go online w/ a compact logix L32 series via Logix 5000 and Ethernet without any issue. Any suggestions would be greatly appreciated, if memory serves correct we do not have 24/7 tech connect contract w/ AB... Trying to get any info before talking to IT and starting the 'round and 'round. Cheer, Emach
  2. I'm looking to point to B3[1].17 good catch. Fixed that and when i went to redownload apparently I angered the RS Linx gods. Need to reboot and try again.
  3. Ok I double checked, it is pointing at the processor. See attached.
  4. Hello, I've struggle to get my PV 1000 to talk to a Compact Logix L32E on Ethernet IP. I can see the PLC and PV via RS Linx and have setup the shortcut in Factory Talk View Studio to point the PV to the PLC. However, when I download to the PV I get "CIP connection (0) opened on route CompactLogix in slot 0 of the chassis at 192.168.20" and "Problem writing value '0' to item [sSOR4]B3[1]7]" Any suggestions? FYI first time PV plus and compact logix user... Cheers, Emach
  5. Hi guys, A quick question regarding instruction efficiency on compact logix PLCs. I translated an old SLC-5/04 program over to a Compact Logix L32E and stumbled upon this. In the SLC program I calculate flow deviation using a MUL instruction followed by a DIV instruction and then adding and subtracting the allowed deviation from the setpoint. Is it more efficient to use the two separate CPT instructions to calculate the high and low limits in the Compact Logix or should I stick with the MUL, DIV, ADD, SUB since it’s such a simple equation? I do this computation or something very similar maybe half a dozen times in a program that’s around 200 rungs spread amongst 10 ladder files. XIC T4:0/DN BST MUL N7:12 N7:13 F8:1 NXB DIV F8:1 100.0 F8:1 NXB ADD N7:12 F8:1 N7:44 NXB SUB N7:12 F8:1 N7:45 BND T4:0 is my power on delay timer N7:12 is the flow setpoint N7:13 is the flow deviation % as an integer F8:1 is the math holding register N7:44 is the high flow limit N7:45 is the low flow limit Cheers, Emach
  6. Anyone out there who could provide a rough series of events for commissioning a machine? The machine has been wired and power has been connected but not turned on. Currently I am working on the PLC program but once I’m done with the program I would like to have some steps to take to safely bring the machine online. Thanks, Emach
  7. A not so simple question for you all. I have a machine that routinely runs for 300 hours. Previous versions of the machine, running SLC's, simply accumulated time using a 60 second timer and used CTD's to tick down the remaining hours and minutes. How bad can the time drift when using this same scheme on a CLX -L32E processor? If the time drift is relatively high, I am looking for some advice on how to calculate the completion time... Should I just convert my cycle time to microseconds and add it to the current value at the start of cycle? That way I could just use a GEQ command to stop the cycle... I'm also thinking I need to use the clock utility to sync the PLC back to the network. This would be really handy when the power drops out.
  8. Timer behavior

    Quick question on the SLC's behavior in regards to timers. I am using two prox switches to measure actuation time using the 0.01 second time base. My issue is my product engineer wants to know how the SLC rounds at the milisecond level. Does anyone know if the SLC always rounds up or down or if what is the rule behind its rounding? Documentation would be extremely appreciated. Regards, Emach
  9. Three phase rectifier

    Thanks for the suggestions!
  10. I'm looking to cobble together a 3ph DC link rectifier for use on a test bench here at work. The load is a 350VDC 150kW motor drive and I have a 480VAC (closer to 495VAC ph-ph) supply. Doing some quick math that means I am looking at around 315A draw on the 480VAC feed and 428A output from the bridge. My issue comes in when I can't find diode bridges rated above 200A continuous, and those need to have their temp kept below 95 deg C! My dumb question is can I gang two bridge modules together by connecting the two dc - outputs together to the neutral point on the wye side of the isolation transformer? Also does anyone out there in the power world know of a cheap V/I/kW panel mount meter? I am looking to monitor the power going into the drive and compare it to my mechanical output power to take a stab at the efficiency of the system. Thanks!
  11. Wire nuts

    Hi all, Building a machine with a few fans, heaters and motors. When it came time to terminate the heaters, the plant EE said to crimp on a wire ring to each wire end, drop a bolt through and then retain it with a nut. My question is with 480VAC and maybe 10 Amps is it safe to use nylon lock nuts in an environment where it can reach +250 deg F? I don't know the formulation of the nylon used in the lock nuts, they are just bulk cheapo's off of Grainger, but we should stay below the melting point of Nylon 6,6 as its minimum is 375 deg F. (ATF the fuild being heated doesn't like to go much above 300 deg F before it starts atomizing and then you have the conditions for a nice dust explosion on your hands). Thanks in advance, Emach
  12. ampacity

  13. A few quick questions on the GV3000. I have a 20HP, 460V unit that is currently driving me crazy. It has an encoder installed and still (in the opinion of my product engineers) has an unacceptable level of instability. This drive is very lightly loaded and I have backed the speed and torque PI values back to default values but I can't quite seem to get the drive to run perfectly smooth. Is anyone a GV3000 guru or can someone point me to a resource beyond the software manual? Addendum, my senior plant EE insists that even with an encoder connected, reported speed is based on flux not on the encoder... I find that hard to believe. The manual stays silent on how it calculates speed in FVC. Plot of the speed going from 500 to 7000 RPM. I see a +/- 10RPM ripple once I start doing 1000 RPM jumps above 2000 RPM. Ok round 3, let me refine my question a bit more. Can someone provide the torque controller block diagram? It is only shown as a black box in the software reference guide. Knowing how and where the flux current regulator comes into play in the torque controller would be handy. Thanks, Emach
  14. Can't find that OTE or OTL

    Jeremy, I am so behind the software eight ball, we still use Panel Builder 32 here....
  15. Can't find that OTE or OTL

    I have a SLC 5/04. Yes, I have a Panelview 1000 and a 1746-SDN attached. There is also one of the AB RS232 to Ethernet/IP stand alone modules in the cabinet but it only provides data to our OPC server. We do not write to the PLC via the Ethernet/IP. The bit in question doesnt appear in the tag editor on the PV. I am currently digging through the device net scanner's M files to see if I can relate my missing bit to a status bit on the appropriate drive. I will look into the cross reference, thanks for the advice. -Ryan