Randy Mahendra Contact Me
Mechanical CAD & Industrial Automation Specialist

Designing mechanical CAD assemblies and industrial PLC & SCADA control architectures.

Combining 3D CAD mechanical design, structural finite element analysis (FEA), deterministic PLC programming, and SCADA system integration for industrial production environments.

Inspect 3D Models View Automation Projects
01 / Mechanical CAD

Interactive 3D Design Showcase

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Laptop Fan Assembly STEP • Interactive Assembly
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More 3D Design Works

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02 / Automation Engineering

PLC & SCADA Control Systems

Documented industrial automation systems, PLC control programs, and SCADA monitoring architectures.

PLC & SCADA Simulation Process: 2-fluid mixing

M221 Simulated Fluid Mixing Tank

Designed and simulated a tank process that combines two fluids using independently controlled inlet valves. The sequence fills the tank, runs a heater and mixer, then drains the finished batch. PLC interlocks and SCADA monitoring model the process, with Cicode simulating tank filling.

PLC Simulator: Modicon M221
SCADA Logic: Cicode simulation
Process Equipment: 2 valves, heater, mixer
Sequence: Fill, mix, heat, drain
Two inlet valves control the addition of each fluid to the mixing tank.
Cicode simulates tank filling while SCADA displays the process state and sequence.
Safety interlocks coordinate the heater, mixer, and drain operation during the batch cycle.
Environment: M221 simulator SCADA + Cicode
High-Speed Motion Tag Count: 850 I/O Points

High-Speed Packaging Line & Motion Control

Developed synchronous multi-axis servo motion profiles and safety matrix logic for a high-speed bottling and cartoning automation line operating at 400 units per minute.

Primary PLC: Allen-Bradley GuardLogix
HMI Interface: FactoryTalk View ME
Motion Control: Kinetix 5700 Servos
Safety Rating: SIL 3 / PL e
CIP Motion synchronization between rotary indexer, electronic camming, and inline reject pusher.
Integrated Point I/O safety light curtains, E-Stop zones, and safety door interlocks directly in Studio 5000.
Recipe management system allowing rapid production changeovers for 12 distinct bottle dimensions.
Environment: Studio 5000 V34 EtherNet/IP DLR
Power Transmission Tag Count: 4,100 Tags

Substation Energy Monitoring SCADA

Engineered a centralized SCADA system for monitoring high-voltage transformers, switchgear status, breaker trip logs, and power quality analyzers across 6 distribution substations.

Primary PAC: Schneider Modicon M580
SCADA Software: AVEVA System Platform
Protocols: IEC 61850 / DNP3
Redundancy: Dual LAN Ring
High-precision Sequence of Events (SOE) timestamping with 1ms resolution for breaker operations.
Automated power factor correction (PFC) capacitor bank switching logic to maintain system efficiency.
Environment: EcoStruxure Control Expert Modbus TCP / DNP3
Pharma Process Tag Count: 620 Tags

Cleanroom HVAC & Pressure Control

Automated environmental control system for ISO Class 5 pharmaceutical cleanrooms. Maintains tight differential pressure cascades, temperature (±0.5°C), and relative humidity controls.

Controller: Beckhoff CX5140 Embedded
HMI / Runtime: TwinCAT 3 HMI
Fieldbus: EtherCAT I/O Cluster
Compliance: FDA 21 CFR Part 11
Multi-stage VFD fan speed control driven by differential pressure sensor feedback loops.
Encrypted batch audit trails and tamper-proof PDF report generation for regulatory compliance.
Environment: TwinCAT 3 eXtended Automation EtherCAT
04 / Direct Contact

Project Inquiries & RFQ

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