A real, peer-industry case with numbers beats a hundred-page brochure

The equipment

Type: steel-pipe end-processing machine (end-cutting / end-punching). Dual-station layout with end-head trolley, feed trolley, wire brush, rotary rollers, hydraulic station, pulse dust collector, pinch rollers, tool holder, pipe pusher, brake and other mechanisms.

In detail: the machine is built around a Siemens S7-1200 CPU 1214C with SM1223 and SM1221 digital expansion modules; multiple SINAMICS G120C variable-frequency drives; 2 servo axes; PROFINET communication to the host; 2 end-punching operator stations. About 54 digital inputs.

EPLAN schematics: 34 A3 pages, GB-standard label structure, covering electrical diagrams, component selection, network topology and operator-station panels.

The original risk

The equipment was designed and built by a small out-of-town machine builder with limited service reach. Once that builder pivots or stops supporting the line, the machine loses its software layer — programs cannot be read, faults cannot be diagnosed, functions cannot be modified. The machine will remain in service for years, so the risk grows over time.

The work

Reviewed every drawing and compiled a control-system “brain” inventory (CPU, expansion, drives, servos, motors, sensors, analogue modules, network, operator stations, protection elements and estimated point counts); mapped the 10-step dual-branch process flow (end-cutting/grinding line A, end-punching/cutting line B, sharing automatic-stop and homing states); built a program-logic draft as the foundation for later reading, custody and retrofit.

The principle

The mechanical, hydraulic and pneumatic hardware can be bought, repaired or even replicated in China. The software layer is what most factories cannot recover once it is lost. Our role is to be the software steward for this machine.

Case 2 · food filling & packaging line (multi-axis servo + weighing)

Equipment & process: automatic filling, capping, labelling and boxing line; Omron CJ2M main controller, 2 Weinview touch panels, 4-axis servo linkage, weighing-module analogue feedback.

Original risk: integrated years ago by a small out-of-town integrator that has since discontinued service; 2 program blocks were read-protected and unreadable; the plant had no program or drawing backup; a previous fault caused several hours of downtime.

What we did: read and verified the readable program on-site; documented the 2 protected blocks with notes on their limitations and alternative handling; built a program-and-drawing asset register; set up an off-site dual backup and performed a restore drill; produced fault-location flowcharts for critical stations.

Indicative results (redacted): unplanned downtime dropped from ~4 events per month to under 1; average fault-location time compressed from ~2 hours to under 30 minutes; program backup completeness rose from ~40% to 100%; one full restore drill performed, 100% success.

Case 3 · automotive parts processing & assembly line (imported controller discontinued)

Equipment & process: machining + assembly line; 4 imported PLC main controllers that have been discontinued by their vendor for more than five years, with servo drives and safety-interlock circuits.

Original risk: spare parts only available on the secondary market, at high prices and with uncertain lead times; the vendor no longer supplies software or firmware support; a main-controller failure would stop the whole line with no replacement path.

What we did: mapped existing process cycle and safety-interlock logic; reverse-engineered the control logic; ported the logic to a controller family that is still in production, preserving original cycle time and safety functions (every safety-circuit change confirmed in writing); staged switchover with a rollback path retained.

Indicative results (redacted): 4 controllers and 6 program blocks migrated; 2 weeks of continuous trial run, zero unplanned downtime; key spare-part lead time reduced from ~8 weeks to under 1 week; investment payback estimated at ~14 months based on avoided downtime loss and spare-part premium.

Case 4 · non-standard special-purpose machines (program rescue + annual support)

Equipment & process: 3 non-standard special machines, Siemens S7-300 and Mitsubishi FX3U mixed, with analogue and temperature-control loops, line cycle ~20 pieces per minute.

Original risk: programs existed only on one engineer’s personal PC, with no version history; a hard-drive failure once lost a program version and the team had to rebuild from memory, taking several days.

What we did: read and archived all 3 controller programs, established version numbering and change logs; enrolled in the annual support package with quarterly integrity checks and backup refresh; wrote an operating manual covering key parameters and alarm meanings for hand-over.

Indicative results (redacted): 3 program versions archived, ~480 points, ~90 alarm entries; remote response within 2 hours; quarterly integrity checks 4 times per year, all identified defects were addressed during planned downtime windows; version-loss rebuilds reduced to zero.

Re-usable within the same industry

De-duplicated control-logic templates for similar equipment can be re-used, so the second and third machines of the same family are delivered faster and with higher quality.

A thicker fault library

Every fault diagnosis and fix is recorded, building our own diagnostic handbook — that is why we can quote the response speeds we do.