Graham EDL

That would make sense that it's not regulating well. We are trying to maintain a 9kPa methane gas pressure and can see the PID PV and CV in the compact logix is all over the shop. I think it was just chucked in there without much tuning. I don't know who would have set any limits, the OPs guys wouldn't go near it and the parameters have been transferred to the new drive without any problems. Thanks for your help.

Hi, We went to one of our sites last week to investigate a Powerflex 753 connected to a 132kW motor that wasn't performing as expected.   The AI is a simple 0-20mA. When we give the mA for anything above about 17.50Hz the drive does not output any further and the volts is around 180V.   Anything mA lower than this value and the drive operates as expected.   When we check in DriveExplorer there are no faults or alarms when trying to drive the motor greater than the value above.     We changed the VSD for a spare and downloaded the program from DriveExplorer. We restarted the drive operates as expected at all setpoints. Attached is the parameter list for the drive now. Previously 1:0.1 was 17.50 Hz 1:0.2 was >18Hz 1:0.3 was around 17.50Hz  whereas as the new listing shows as expected.  (We are trying to control to a SP of 9kPa and tuning the PID loop in the Micrologix will be the next item on the list so not too worried about the difference at the moment.)   Does anyone know why there wouldn't be faults or alarms for the drive not reaching 1:0.2 when >18Hz?   Thanks.

It was always accelerating. We could see on the new drive that it changed to accelerating, decelerating and maintaining speed (I think it said but it was longer ago than yesterday so hard to say).

Hi, Looking for a bit of a sanity check on my procedure here and also bit of advice for the Mapping in CLX.   I'm looking to upgrade from PLC5 to CLX. It is not possible to stop the process for a lengthy amount of time so an element of hot-swapping with occasional shutdowns will take place. My analogs will be installed on a new rack but I want to read the digital inputs through a gateway from PLC5 to CLX. Or rather I want to write all the inputs immediately one changes in the PLC5. My PLC5 inputs are in different areas of the I1 data table so I have moved them all to N10:120 to N10:135 (N10:120 Len16). They are in I:042 to I:057 and I:104 to I:105. For writing I plan to use FSC, COP and MSG in PLC5. __________________________________________________ PLC5 FSC N10:120 Len 16 <> N10:200 Len16 COP N10:120 Len 16 to N10:200 Len16 MSG This PLC5: Communication Command PLC5-Typed Write, Data Table Address N10:200, Size in elements 16, Port Number 5 Target Device: Data Table Address 10(???), Local Station Address(oct) 33 (Gateway), Local/ Remote Local. _________________________________________________ CLX Map PLC5 Filenumber 10 (???), Name N10[0]   N10[0] is DINT[16] Data type.   My questions are 1. Is my PLC5 MSG structure correct? is target data table address just 10. 2. How do I match a Filenumber in CLX to N10[0] in the PLC5 if not 10? 3. If Filenumber only accepts integers, do I need to move a whole data table?     Thanks in advance.

Thanks guys. OPs are doing a service exchange on the drive but I'll try to find out the cause.   My initial thought was it is something in the Power electronics. 

Hi. I have a DH+ network with several PLCs, an Engineering station and a PRosoft ANX Gateway. I am using the gateway to read data files from the PLCs to a CLX then to my HMI.   PLC-1 has 2 data files PLC-2 has 2 data files PLC-3 has 3 data files PLC-4 has 12 data files. (one of these, F8, has length of 395 and takes around 4000ms to read.) PLC-4 also has a couple of write Messages that are sent on change of datafile entry and only a few times a day, for alarm resets and setpoint changes.   My issue is that one of my PLC-4 (PLC5/40B) stops communicating through Channel 1A (Node Address 7) to the gateway when it is getting requests from the CLX. All messages are in a queue that waits for 200ms from previous read .DN before initiating the next read. The queue has the PLC data file separated as much as possible. eg PLC-4/1 then PLC-4/2 then PLC-1/1 then  PLC-4/3 then PLC-1/2 then etc.   I have to then change the DH+ cable to Channel 2A (Node address 5) and change my MESSAGE blocks in CLX to read from that node instead.   I cannot go online to PLC-4 at Node address 7 as it is not seen in Linx but when I go to node address 5 I can get in through the back door and go online. I am unable to communicate with, say, PLC-1 from PLC-4 when I make a new MESSAGE block in PLC-4 (reading into node 5).   When I connect another Gateway DH+ cable to node address 7 I can see the gateway in Linx but not address 7.   It's like Channel 1A has locked, so how do I unlock while the PLC is running? Before I've had to cycle power to the CPU to restore comms.   Thanks in advance.    

With our process shut down I tried to change the key position from REM-PROG-RUN-REM to see if it would reset my locked port but no joy. Eventually had to cycle power to the PLC to restore the comms, which are now working in both channels, for now.  

I can communicate between PLCs when I make a new MESSAGE block but not when I do a copy-paste of an existing one.