Internet PLC Forum

Hi,

I'm trying to access the ftp function of a Nano and FMD8 PLC.

I have set-up filezilla the same as in the manual, the connection is made but fails to create directory listing??  

this is happening on two Nano's and one FMD so I'm guessing its me and not the PLC but everything looks to be set-up right??

I have connected to the PLC's about six months ago which worked fine........

Hi Guys,

I'm using the outputs on a nano to indicate if the communication on the serial and Ethernet port is working OK.  I need all four outputs which is fine for  outputs 1 & 2 but 3 & 4 are also connected to relays.

When the comm's is running the relays are on and off every second which is probably not doing them any good but perhaps more important, they are driving me mad!

Would there be any adverse situations if I just de-solder the relays.

Cheers

Hi,

I was trying to download the nano ethernet sample program on my W7 x 64 PC (tri 6.4).  half way during the download the transfer would fail (freeze).  swapped over to my XP machine V6.3 and all was ok.

Not sure if you have seen this but thought I would let you know... if you need any further testing please let me know.

Cheers

Hi,

I'm thinking of using a Nano PLC to read some modbus slave data into the DM via the RS485 port.

Then use My Modbus TCP master access the PLC via the Ethernet port to read / write data back and forth to the slave device.

I need to ensure I don?t end up over writing values that are being read into the same location simultaneously, likewise I'm not sure how the PLC will respond to the TCP port reading a DM value at the same time the serial port is writing the data??

I was also thinking about request / response timing on both ports and if a buffer may be needed??

Do you guys have any words of advice before I commit too much time to this?  do you think I would be better off purchasing an off the shelf serial to Ethernet server?

Any thoughts appreciated.

Hi,

I beleive I have a damaged AI.

After correcting some wiring in a control panel I noticed one of the AI's wasn't reading the input signal.  The AI was subject to 24VDC for the best part of a weeK!

Looking at the PCB, after the input terminal there is a capacitor and a resistor bank "RA4"?, then off the to main processor.

Are there any checks I can do or components that I can replace?

Cheers

Hi,  

I'm using an input to increment a DM value in a program we use on our standard panels.  DM value is used to change between LCD screens as we need to display data on the LCD

One niggle I have is that when I energise the input via a standard push-button, the PLC doesn't always see the input change state so the DM value isn't incremented.

After several attempts the value increments and the screen changes however this process can be somewhat frustrating.  

The program itself uses half the available program space, and I assume the reason for the intermittent reading of the input is due to the PLC resources being used elsewhere but I thought the scan time would be quick enough to pick this up??  Is there any way I can measure the scan time?

Can I prioritise this input into the PLC program?

Cheers

Sorry,

Giving you a bashing this week!

I'm working on a project in the Sahara and they have alot of issues with dust and sand and vibration proofing their equipment.

Have you or any of your customers resin encapsulated a PLC board?  I was thinking of going upto the base of the IC holders so any IC's could be replaced, anything else would be PLC write-off?

Do you think heat dissipation would a problem?  Other than the main CPU and maybe the PSU regulators are there any other parts that generate excessive heat?

Many Thanks

Hi,

I have been a big fan of your products for some time now,  I have some TMD24's in the field and I'm just about to add another 2-3 PLC's to the same site.  

So far they have proved to be very reliable, and the support you guys provide is unmatched in the industry.

My comments on the hardware:

1) My biggest gripe with the PLC's and peripheral cards are the lack of support provided by the DIN rail connector kit.  The PCB is a non standard size for most universal PCB enclosurse which is a shame, as this would greatly improve the aesthetics of the product.

http://www.dinrailenclosure.com/dinsupports.php

2) Connectors, I have mixed feelings over these, I too prefer the Phoenix connectors as mentioned by other posts.  I have only ever had one issue with an analogue input connection, after I swapped this with a spare connector, all was well.  I think they are practical but not optimal.

3) The new F series, I have seen one of these in the flesh but I have yet to play with one.  I?m sure they are solid like the rest of the range. I noticed some text on the PCB "CAN?, are you looking to add CAN to these PLC's and associated modules?  I think this would be a great addition.

4) Again on the F series, the analogue IO is much improved with a 10V supply, which in my experience is a standard reference.  My big problem is why did you go with the DB15?  I think this is real mistake, DB15 cables and interfaces are becoming obsolete and this should have been terminals, I appreciate PCB space is tight but this is a step backward in my opinion.

4) One thing that is common over here (UK) is that the PCBs are flipped over, with only the connectors showing on the ?clean? side of the board.  This way all the "guts" are out of sight and you have room for PCB labeling, company logo etc.

My comments on the software:

1)   Quick tags ? why can?t you add more than 5?  Surely it cannot be hard to add as many as you want?

2)   I would like to see multiple pages of PLC code, by this I mean if I have some code for say pump control no.1  on page 1 and code for pump no.x on page x for example.  All the pages can be compiled as one when downloaded to the PLC.  This is just a house keeping thing that I am used to seeing. Another solution would be to compile multiple files, although this may be flawed as keeping the IO tags unique maybe a challenge, I?m sure the complier would pick it up but it may be a headache for the programmer.

3)   Modbus mapping ? I would really like to see an option to map the data memory to a Modbus register at bit level not just word level i.e. DM[1] ? DM[16] = 41001

4)   I would also like to use the data memory as a contact in the main program i.e. use DM[1] as a contact in a circuit to set a relay or output etc  if the value in DM[1] > 0 it would be true.  I know you have setio, set relay commands etc but you have to hunt these down in your custom function, and this would be more direct.

5)   Longer IO tag names would also be nice.

6)   Import and export IO tag names, custom functions etc to excel



My apologies if any or all of the above exist already, if they do I have failed to find them.  

Regarding the hardware, to implement any of the changes there will inevitably involve a cost, for some of the items I believe the cost would be justified

All in all I like the product very much and look forward to using it in the future.