Operandi converts Siemens S7-300/400 STL into readable SCL for TIA Portal. Every network is checked. Nothing is guessed.
Most S7-300 programs from 1995 to 2005 have no comments, no documentation and no one left to explain them. Spare parts are running out, so the modernization has to happen anyway.
3-9months
to rewrite the logic of one production line by hand
€50-150kper line
in integrator hours for a manual rewrite
€20kper minute
what a stopped line can cost in automotive
How it works
Reads the AWL source exported from SIMATIC Manager, in English or German mnemonics, and splits it into blocks and networks.
Tracks ACCU 1, ACCU 2 and the status word symbolically, so every L and T chain becomes a plain, typed assignment.
Jumps become IF, CASE and REPEAT. No GOTO, no helper flags. Jumps that cannot be structured go to manual review.
An independent STL simulator runs against the generated SCL. Up to 16 inputs every state is tested, above that 65,536 sampled states, and the report says which.
AI 1.0
JCHIGH
L100
TMW 10
JUDONE
HIGH:L250
TMW 10
DONE:NOP0
REGION Network 1: Select a setpoint
//Operandi: equivalent to the STL reference model in 65536 sampled input states (not exhaustive)
IF NOT %I1.0 THEN //STL lines 9-10
%MW10 := WORD#16#0064; //STL lines 11-12
ELSE
%MW10 := WORD#16#00FA; //STL lines 14-15
END_IF;
END_REGION
Hover a line of SCL to see the STL it came from.
Real input and output of the Operandi engine, test fixture control_flow_en.
REGION Network 4: Extended pulse timer stays manual (MANUAL REVIEW REQUIRED)
(*
OPERANDI: MANUAL REVIEW REQUIRED. This network was not converted automatically.
Reason:
line 32: T 3 is an extended pulse timer (SE); the IEC pulse timer TP
does not restart while it runs; convert this timer by hand
Original STL (lines 30-34):
A I 0.3;
L S5T#500MS;
SE T 3;
A T 3;
= Q 4.2;
*)
OPERANDI_MANUAL_REVIEW_REQUIRED;
END_REGION
A network is converted only when every instruction in it is supported and the equivalence check passes. Otherwise you get the original STL, the reason and a marker that deliberately blocks compilation in TIA Portal.
Indirect addressing, MCR, status-bit jumps and S5 timers without an exact IEC twin are flagged, never approximated.
F-FBs and F-FCs from Distributed Safety are out of scope for good. Safety logic stays with your safety engineer.
Conversion is deterministic. The same source gives the same SCL byte for byte, so every review and diff stays valid.
Offline
One Windows executable. No installer, no admin rights, no internet connection. Your code, recipes and I/O addresses stay inside the plant.
Ed25519-signed licence file. You activate the key once on any computer with internet access, then the file works offline until the end of the paid period.
A deterministic compiler, not a chatbot. Your code is never used to train any model.
Each SCL statement carries the STL lines it came from, so review is a comparison, not an investigation.
Import the SCL into TIA Portal, run PLCSIM and your FAT and SAT exactly as you would after a manual rewrite.
Operandi is an engineering assistant. The final validation of the machine stays with the people who commission it.
Move the sliders to match your project. The estimate uses about 36 lines of STL rewritten and tested per engineer hour.
With Operandi
Conversion runs in minutes. Your engineers review the flagged networks and run the usual tests.
Pro from €249 per month
Estimate only. Real effort depends on the code base and the share of networks flagged for manual review.
Pricing
Net prices in EUR per seat. VAT is added at checkout according to the buyer's country. Every plan includes an offline licence, updates and bug fixes. You buy a tool, not a service: no implementation, consulting or code review.
Review a legacy program before you quote or change a machine
€39
per seat per month
€390
per seat per year
For code migration
Migrate STL to SCL for TIA Portal
€249
per seat per month
€2,490
per seat per year
Our payment partner issues the invoice automatically. Need several seats? Write to [email protected]
No. Operandi is a deterministic compiler written in Rust. There is no language model anywhere in the conversion path, so the same input always produces the same output and nothing is invented.
The STL source of your blocks from SIMATIC Manager (Generate Source, .awl files). LAD and FBD blocks work too, because Generate Source writes them as STL. A symbol table (.sdf or .asc) is optional and gives the SCL your real names. STEP 5 and memory dumps are not supported yet.
Today: external SCL source for TIA Portal and S7-1500, with symbols, data blocks, UDTs, FB and FC calls, S5 timers and counters. A generic IEC 61131-3 backend for CODESYS, TwinCAT and PLCopen XML is planned.
The network stays in the SCL as a commented copy of the original STL with the exact reason, followed by OPERANDI_MANUAL_REVIEW_REQUIRED. That marker breaks compilation on purpose, so unchecked code can never reach a PLC.
No. Operandi runs offline on your own laptop, the trial included, and the licence is checked locally. We never receive your code unless you choose to attach an example to a bug report.
No. We sell the tool, not a service. Your team or your integrator runs the conversion, reviews the flagged networks, tests and commissions the machine. Support covers bugs in the tool itself: if Operandi translates a network wrongly, email us an example without sensitive data and the fix ships in an update.
You buy Audit or Pro per seat, monthly or yearly, through our payment partner, which also issues the invoice. The licence key and the download link arrive by email. You activate the key once on any computer with internet access and get a licence file that works offline until the end of the paid period. You can cancel at any time in the customer portal.
The company that modernizes and commissions it, as the EU Machinery Regulation 2023/1230 requires. Operandi produces a code proposal with a full audit trail. FAT, SAT and safety validation stay with your team.
Ask for a trial and we send you the tool with a trial key. The conversion runs offline on your machine, so your code never leaves the plant. Free and without obligation.
or write to [email protected]