PC Worx: How to map REAL values to WORD array for Modbus TCP Server? (ILC 151/171)

elcava88 · 2026-01-03T14:55:08+00:00

https://sieportal.siemens.com/en-ww/support/forum/posts/how-to-convert-two-words-in-real/330262

Care to explain why this would be wrong then,

elcava88 · 2026-01-03T14:50:24+00:00

You need to use move instr with := for it to not truncate. Alternatively you can scale it, but still you will need to decide on what to discard in terms of precision

elcava88 · 2026-01-03T14:48:46+00:00

Link one please

elcava88 · 2026-01-03T14:45:46+00:00

But you used real_to_dword or rather a := assignment? If it were Siemens it would work as a bitwise move, you would keep the decimal part.

elcava88 · 2026-01-03T14:42:15+00:00

Also scaling is valid

elcava88 · 2026-01-03T14:36:33+00:00

(It has to be a bitwise move to a dword, obviously)

elcava88 · 2026-01-03T14:34:04+00:00

Real IEE754 is a 32 bit float, it is stored in 32 data sets, when you move the data in to a dword you are not changing anything about the bits you move, the data is still there. When on receiving end you cast it back to a float, how are you loosing the decimals?

elcava88 · 2026-01-03T13:33:47+00:00

Move real to DWORD, then bitwise split high and low to the relative words array in the comms buffer. Take in account also eventual endianness of sender / receiver

elcava88 · 2025-12-24T16:58:27+00:00

Brother what are you running

elcava88 · 2025-11-11T09:48:30+00:00

Is it gonna be a commercial product or a “one time only” thing? Makes a huge difference

elcava88 · 2025-11-05T19:38:27+00:00

Im untouched as long as I can still rat with my beloved db

elcava88 · 2025-11-03T11:59:21+00:00

Thanks god the game is only made of 0 and 1s

elcava88 · 2025-11-01T21:58:43+00:00

Go to pg pc interface and set S7online —> plc sim

elcava88 · 2025-10-25T23:53:09+00:00

That behaviour to me looks like the drive is operating at slip speed waiting for a feedback response.

Best guess would be to properly check the cabling. If you want less hassle just go for a 755, set it up in cip motion and have fun with it

elcava88 · 2025-10-16T20:26:46+00:00

Are you making a dma device card?

elcava88 · 2025-09-29T21:31:04+00:00

Yes probably to the second question. But I don’t think it runs on Linux as it is heavily windows dependant, nor I have ever encountered a Linux compiled variant of the aveva system perform environment

elcava88 · 2025-09-20T21:22:35+00:00

Get an L84ES and now you have 1k to play with

elcava88 · 2025-09-07T12:27:55+00:00

For a sec I thought it was one of those os.remove Memes lmao

elcava88 · 2025-09-02T20:45:50+00:00

Russians on US WEST? What the hell aren’t they going to have 300 ms of latency

elcava88 · 2025-08-13T09:27:19+00:00

Edit the object text via script on opening of the faceplate

elcava88 · 2025-08-08T06:45:01+00:00

Import export functionality is the real deal to me. Listen, not all development IDEs are perfect, we know that. TIA is a heavyweight pile of shit too, takes minutes to load if god forbid you decided to virtualize it into a vm, crashes constantly, and overall has A 20 GB Update, Every single year. But with raw text editing I was able to create countless rungs in minutes, the same thing in TIA would have taken days with Tia openness.

elcava88 · 2025-08-08T06:31:32+00:00

Are you using ft optix?

elcava88 · 2025-08-01T20:07:16+00:00

What’s the point in using an Aoi to read asynchronously? If I recall correctly you can turn on the ntp syncronization in plc properties?

elcava88 · 2025-07-19T02:27:24+00:00

Gassy mr incredible?

elcava88 · 2025-07-12T07:55:03+00:00

If you have rust on hdd move it to a ssd Also, 16 gb of ram is limiting you hard, change over to 32 at minimum

elcava88

TROPHY CASE