[Facilities Mechanic]

Hi Joe

Happy to consider this if you are located in the UK.

Regards

Tony Spearing

Technical Manager

i4 Automation Ltd

01480 395256

[looking for someone to write a program for a chemical dispenser/mixer. Visilogic]

Hi

We may be able to help depending on when you need the project delivering by, what date are you looking at for completion and which country are you in?

Regards

Tony

tony @ i4automation.co .uk

[***New VisiLogic Help File****]

Thanks for that Cara

I also found that after I had extract the Visilogic.gif but before I copied it to the program directories I had to right click the file, go to Security, and 'Unblock' it. I also opened it as well then it made me a Visilogic.chw file and I copied that over as well.

Hope this helps.

Tony

[protocol fb question]

Hi Paul

As you had also put through your question on Facebook I assumed you were UK based.

I used the coms sniffer on a V570 to look at a known working Modbus command, read holding registers 0-31 and then tried to duplicate the message using the Protocol FB. I came across a small snag in that the CRC byte order in wrong, it's back to front.

The working message is

01 03 00 00 00 20 44 12

which the Protocol FB generates as

01 03 00 00 00 20 12 44

I cannot see a way to reverse the CRC bytes automatically but as I guess you do not need to have many messages you could work out the CRC using the above method and then hard code it in the Protocol FB. The method for generating the CRC for Modbus appears to be binary, zero forward offset, zero backward offset, CRC-16, 256 (100H), 2 bytes.

Note that the message is only 8 bytes long including the CRC, the screen shots added by Nouy would look like this for my message, two extra bytes at the front of the message.

00 01 00 03 00 00 00 20 xx yy

Hope this helps but if you still have issues them please get back to me.

Tony

[protocol fb question]

Hi Paul Have seen your FaceBook message and have read the gist of your requirement. I think the answer is Yes, it can be done, the Modbus frame is small and can be constructed using the Protocol FB. I am training all day Thursday but if you would like to talk through your problem on Friday my number is 01480 276446.RegardsTony. Tony Spearing - Technical Manager, i4 Automation Ltd

[Alarm limitation in Vision PLC's]

I was recently surprised to discover that you can only define 128 alarms in a V1210 PLC, which I think is somewhat light considering how many IO you can attach and control.

I see from other forum entries that we can use events and build our own alarms but then you have two systems on one PLC.

The use of alarms in the UK has risen rapidly over the years as we try not to rely on the programming software to diagnose a problem. It would be really useful if some way could be found to increase the total number available in a future software release.

Here's hoping.

Tony

[Windows Tablet]

Does anybody have any experience of trying to run Remote Operator on a Windows Tablet?

Thanks

Tony

[What happened to old forum?]

Glad to hear the old forum is being preserved, it has proved useful in the past.

Tony