Learning to implement Sequential Function Charts (SFC) for Material Handling using Inovance's InoProShop / AutoShop is an essential skill for PLC programmers working in Logistics & Warehousing. This comprehensive guide walks you through the fundamentals, providing clear explanations and practical examples that you can apply immediately to real-world projects.
Inovance has established itself as High in China across textiles, packaging, lithium battery, EV manufacturing, elevators, robotics; growing in SE Asia and MEA, making it a strategic choice for Material Handling applications. With ~2% global, top-3 in China global market share and 7 popular PLC families including the AM600 and AM610, Inovance provides the robust platform needed for intermediate to advanced complexity projects like Material Handling.
The Sequential Function Charts (SFC) approach is particularly well-suited for Material Handling because batch processes, step-by-step operations, state machines, and complex sequential control. This combination allows you to leverage perfect for sequential processes while managing the typical challenges of Material Handling, including route optimization and traffic management.
Throughout this guide, you'll discover step-by-step implementation strategies, working code examples tested on InoProShop / AutoShop, and industry best practices specific to Logistics & Warehousing. Whether you're programming your first Material Handling system or transitioning from another PLC platform, this guide provides the practical knowledge you need to succeed with Inovance Sequential Function Charts (SFC) programming.
Inovance InoProShop / AutoShop for Material Handling
Inovance ships InoProShop as its primary programming IDE for the AM600 / AM610 / H5U medium-PLC families and AutoShop for the Easy-series compact PLCs. InoProShop is built on the CODESYS 3.5 platform, which means engineers transferring from Beckhoff TwinCAT, WAGO e!Cockpit, or Schneider EcoStruxure Machine Expert will recognise the project tree, IEC 61131-3 editors, and visualisation tools immediately. AutoShop is a more traditional ladder-and-IL editor closer to compact-PLC tradition. Inovance'...
Platform Strengths for Material Handling:
- CODESYS-based InoProShop for IEC 61131-3 compliance
- Tight integration with Inovance servo drives and inverters
- Strong motion, robotics, and elevator-control product lines
- EtherCAT support across mid-tier and high-end CPUs
Unique ${brand.software} Features:
- InoProShop built on CODESYS 3.5 — full IEC 61131-3 compliance
- Native EtherCAT motion across mid-tier and high-end CPUs
- Tight integration with Inovance servo drives, inverters, and HMIs
- AutoShop for compact AC800 / Easy-series CPUs (lighter IDE)
Key Capabilities:
The InoProShop / AutoShop environment excels at Material Handling applications through its codesys-based inoproshop for iec 61131-3 compliance. This is particularly valuable when working with the 5 sensor types typically found in Material Handling systems, including Laser scanners, RFID readers, Barcode scanners.
Control Equipment for Material Handling:
- Automated storage and retrieval systems (AS/RS)
- Automated guided vehicles (AGVs/AMRs)
- Vertical lift modules (VLMs)
- Carousel systems (horizontal and vertical)
Inovance's controller families for Material Handling include:
- AM600: Suitable for intermediate to advanced Material Handling applications
- AM610: Suitable for intermediate to advanced Material Handling applications
- H5U: Suitable for intermediate to advanced Material Handling applications
- AC800: Suitable for intermediate to advanced Material Handling applications
Hardware Selection Guidance:
Inovance CPU choice ranges from Easy320 / Easy510 (compact, AutoShop-programmed, FX-style memory model) through AC800 (mid-range compact) to AM600 / AM610 / H5U (medium PLC with EtherCAT, OPC UA, redundant networking on H5U). AM600 is the volume product for OEM machinery; H5U is the choice for higher-axis-count motion applications and lithium-battery / EV manufacturing lines where EtherCAT and tig...
Industry Recognition:
High in China across textiles, packaging, lithium battery, EV manufacturing, elevators, robotics; growing in SE Asia and MEA. High in Chinese EV manufacturing — Inovance is a major automation supplier to BYD, NIO, and Tier 2/3 EV-component plants. AM600 + H5U with EtherCAT motion controls battery-cell assembly, module welding, pack assembly, and end-of-line test stations. Less common in Western Tier 1 automotive but appear...
Investment Considerations:
With $$ pricing, Inovance positions itself in the mid-range segment. For Material Handling projects requiring advanced skill levels and 4-12 weeks development time, the total investment includes hardware, software licensing, training, and ongoing support.
Understanding Sequential Function Charts (SFC) for Material Handling
Sequential Function Chart (SFC) is a graphical language for programming sequential processes. It models systems as a series of steps connected by transitions, ideal for batch processes and machine sequences.
Execution Model:
Only active steps execute their actions. Transitions define conditions for moving between steps. Multiple steps can be active simultaneously in parallel branches.
Core Advantages for Material Handling:
- Perfect for sequential processes: Critical for Material Handling when handling intermediate to advanced control logic
- Clear visualization of process flow: Critical for Material Handling when handling intermediate to advanced control logic
- Easy to understand process steps: Critical for Material Handling when handling intermediate to advanced control logic
- Good for batch operations: Critical for Material Handling when handling intermediate to advanced control logic
- Simplifies complex sequences: Critical for Material Handling when handling intermediate to advanced control logic
Why Sequential Function Charts (SFC) Fits Material Handling:
Material Handling systems in Logistics & Warehousing typically involve:
- Sensors: Barcode scanners for product/location identification, RFID readers for pallet and container tracking, Photoelectric sensors for load presence detection
- Actuators: Conveyor motors and drives, Crane bridge, hoist, and trolley drives, Shuttle car drives
- Complexity: Intermediate to Advanced with challenges including Maintaining inventory accuracy in real-time
Programming Fundamentals in Sequential Function Charts (SFC):
Steps:
- initialStep: Double-bordered box - starting point of sequence, active on program start
- normalStep: Single-bordered box - becomes active when preceding transition fires
- actions: Associated code that executes while step is active
Transitions:
- condition: Boolean expression that must be TRUE to advance
- firing: Transition fires when preceding step is active AND condition is TRUE
- priority: In selective branches, transitions are evaluated in defined order
ActionQualifiers:
- N: Non-stored - executes while step is active
- S: Set - sets output TRUE on step entry, remains TRUE
- R: Reset - sets output FALSE on step entry
Best Practices for Sequential Function Charts (SFC):
- Start with a clear process flow diagram before implementing SFC
- Use descriptive step names indicating what happens (e.g., Filling, Heating)
- Keep transition conditions simple - complex logic goes in action code
- Implement timeout transitions to prevent stuck sequences
- Always provide a path back to initial step for reset/restart
Common Mistakes to Avoid:
- Forgetting to include stop/abort transitions for emergency handling
- Creating deadlocks where no transition can fire
- Not handling the case where transition conditions never become TRUE
- Using S (Set) actions without corresponding R (Reset) actions
Typical Applications:
1. Bottle filling: Directly applicable to Material Handling
2. Assembly sequences: Related control patterns
3. Material handling: Related control patterns
4. Batch mixing: Related control patterns
Understanding these fundamentals prepares you to implement effective Sequential Function Charts (SFC) solutions for Material Handling using Inovance InoProShop / AutoShop.
Implementing Material Handling with Sequential Function Charts (SFC)
Material handling automation uses PLCs to control the movement, storage, and retrieval of materials in warehouses, distribution centers, and manufacturing facilities. These systems optimize storage density, picking efficiency, and inventory accuracy.
This walkthrough demonstrates practical implementation using Inovance InoProShop / AutoShop and Sequential Function Charts (SFC) programming.
System Requirements:
A typical Material Handling implementation includes:
Input Devices (Sensors):
1. Barcode scanners for product/location identification: Critical for monitoring system state
2. RFID readers for pallet and container tracking: Critical for monitoring system state
3. Photoelectric sensors for load presence detection: Critical for monitoring system state
4. Height and dimension sensors for load verification: Critical for monitoring system state
5. Position encoders for crane and shuttle systems: Critical for monitoring system state
Output Devices (Actuators):
1. Conveyor motors and drives: Primary control output
2. Crane bridge, hoist, and trolley drives: Supporting control function
3. Shuttle car drives: Supporting control function
4. Fork positioning and load handling: Supporting control function
5. Vertical lift mechanisms: Supporting control function
Control Equipment:
- Automated storage and retrieval systems (AS/RS)
- Automated guided vehicles (AGVs/AMRs)
- Vertical lift modules (VLMs)
- Carousel systems (horizontal and vertical)
Control Strategies for Material Handling:
1. Primary Control: Automated material movement using PLCs for warehouse automation, AGVs, and logistics systems.
2. Safety Interlocks: Preventing Route optimization
3. Error Recovery: Handling Traffic management
Implementation Steps:
Step 1: Map all storage locations with addressing scheme
In InoProShop / AutoShop, map all storage locations with addressing scheme.
Step 2: Define product characteristics (size, weight, handling requirements)
In InoProShop / AutoShop, define product characteristics (size, weight, handling requirements).
Step 3: Implement location tracking database interface
In InoProShop / AutoShop, implement location tracking database interface.
Step 4: Program crane/shuttle motion control with positioning
In InoProShop / AutoShop, program crane/shuttle motion control with positioning.
Step 5: Add load verification (presence, dimension, weight)
In InoProShop / AutoShop, add load verification (presence, dimension, weight).
Step 6: Implement WMS interface for task assignment
In InoProShop / AutoShop, implement wms interface for task assignment.
Inovance Function Design:
InoProShop strongly favours function-block reuse via the Library Manager — Inovance ships standard libraries for motion, drives, HMI, OPC UA, and industry-specific applications (lithium-battery, EV, elevator). AutoShop reuse is open-coded via P-label subroutines. OEM machine-builders increasingly default to InoProShop / AM600 to access the FB libraries.
Common Challenges and Solutions:
1. Maintaining inventory accuracy in real-time
- Solution: Sequential Function Charts (SFC) addresses this through Perfect for sequential processes.
2. Handling damaged or misplaced loads
- Solution: Sequential Function Charts (SFC) addresses this through Clear visualization of process flow.
3. Coordinating multiple cranes in same aisle
- Solution: Sequential Function Charts (SFC) addresses this through Easy to understand process steps.
4. Optimizing storage assignment dynamically
- Solution: Sequential Function Charts (SFC) addresses this through Good for batch operations.
Safety Considerations:
- Aisle entry protection with light curtains and interlocks
- Personnel detection in automated zones
- Safe positioning for maintenance access
- Overload protection for cranes and lifts
- Fire suppression system integration
Performance Metrics:
- Scan Time: Optimize for 5 inputs and 5 outputs
- Memory Usage: Efficient data structures for AM600 capabilities
- Response Time: Meeting Logistics & Warehousing requirements for Material Handling
Inovance Diagnostic Tools:
InoProShop online mode with full POU monitoring and breakpoint debug,EtherCAT diagnostics page with topology and slave status,Trace tool for analogue / motion signal capture,OPC UA server diagnostics page,Modbus communication trace utility,AutoShop online mode for legacy AC800 / Easy series,Inovance HMI integrated diagnostics for HMI-PLC binding faults,Servo-drive panel diagnostics with InoProShop drive-monitor view,EtherCAT slave-firmware update tool,Project compare tool for change tracking
Inovance's InoProShop / AutoShop provides tools for performance monitoring and optimization, essential for achieving the 4-12 weeks development timeline while maintaining code quality.
Inovance Sequential Function Charts (SFC) Example for Material Handling
Complete working example demonstrating Sequential Function Charts (SFC) implementation for Material Handling using Inovance InoProShop / AutoShop. Follows Inovance naming conventions. Tested on AM600 hardware.
// Inovance InoProShop / AutoShop - Material Handling Control
// Sequential Function Charts (SFC) Implementation for Logistics & Warehousing
// On InoProShop projects, conventions follow CODESYS / IEC nor
// ============================================
// Variable Declarations
// ============================================
VAR
bEnable : BOOL := FALSE;
bEmergencyStop : BOOL := FALSE;
rLaserscanners : REAL;
rAGVmotors : REAL;
END_VAR
// ============================================
// Input Conditioning - Barcode scanners for product/location identification
// ============================================
// Standard input processing
IF rLaserscanners > 0.0 THEN
bEnable := TRUE;
END_IF;
// ============================================
// Safety Interlock - Aisle entry protection with light curtains and interlocks
// ============================================
IF bEmergencyStop THEN
rAGVmotors := 0.0;
bEnable := FALSE;
END_IF;
// ============================================
// Main Material Handling Control Logic
// ============================================
IF bEnable AND NOT bEmergencyStop THEN
// Material handling automation uses PLCs to control the moveme
rAGVmotors := rLaserscanners * 1.0;
// Process monitoring
// Add specific control logic here
ELSE
rAGVmotors := 0.0;
END_IF;Code Explanation:
- 1.Sequential Function Charts (SFC) structure optimized for Material Handling in Logistics & Warehousing applications
- 2.Input conditioning handles Barcode scanners for product/location identification signals
- 3.Safety interlock ensures Aisle entry protection with light curtains and interlocks always takes priority
- 4.Main control implements Material handling automation uses PLCs t
- 5.Code runs every scan cycle on AM600 (typically 5-20ms)
Best Practices
- ✓Follow Inovance naming conventions: On InoProShop projects, conventions follow CODESYS / IEC norms — PascalCase for
- ✓Inovance function design: InoProShop strongly favours function-block reuse via the Library Manager — Inova
- ✓Data organization: InoProShop uses GVLs and persistent variables for shared data. AutoShop uses D /
- ✓Sequential Function Charts (SFC): Start with a clear process flow diagram before implementing SFC
- ✓Sequential Function Charts (SFC): Use descriptive step names indicating what happens (e.g., Filling, Heating)
- ✓Sequential Function Charts (SFC): Keep transition conditions simple - complex logic goes in action code
- ✓Material Handling: Verify load presence before and after each move
- ✓Material Handling: Implement inventory checkpoints for reconciliation
- ✓Material Handling: Use location states to prevent double storage
- ✓Debug with InoProShop / AutoShop: Use InoProShop's online mode to set breakpoints in POUs and step throu
- ✓Safety: Aisle entry protection with light curtains and interlocks
- ✓Use InoProShop / AutoShop simulation tools to test Material Handling logic before deployment
Common Pitfalls to Avoid
- ⚠Sequential Function Charts (SFC): Forgetting to include stop/abort transitions for emergency handling
- ⚠Sequential Function Charts (SFC): Creating deadlocks where no transition can fire
- ⚠Sequential Function Charts (SFC): Not handling the case where transition conditions never become TRUE
- ⚠Inovance common error: EtherCAT slave order mismatch after physical re-cabling — slave addressing break
- ⚠Material Handling: Maintaining inventory accuracy in real-time
- ⚠Material Handling: Handling damaged or misplaced loads
- ⚠Neglecting to validate Barcode scanners for product/location identification leads to control errors
- ⚠Insufficient comments make Sequential Function Charts (SFC) programs unmaintainable over time
Related Certifications
Mastering Sequential Function Charts (SFC) for Material Handling applications using Inovance InoProShop / AutoShop requires understanding both the platform's capabilities and the specific demands of Logistics & Warehousing. This guide has provided comprehensive coverage of implementation strategies, working code examples, best practices, and common pitfalls to help you succeed with intermediate to advanced Material Handling projects.
Inovance's ~2% global, top-3 in China market share and high in china across textiles, packaging, lithium battery, ev manufacturing, elevators, robotics; growing in se asia and mea demonstrate the platform's capability for demanding applications. The platform excels in Logistics & Warehousing applications where Material Handling reliability is critical.
By following the practices outlined in this guide—from proper program structure and Sequential Function Charts (SFC) best practices to Inovance-specific optimizations—you can deliver reliable Material Handling systems that meet Logistics & Warehousing requirements.
Next Steps for Professional Development:
1. Certification: Pursue Inovance Certified Engineer to validate your Inovance expertise
2. Advanced Training: Consider InoProShop / AutoShop training certificates for specialized Logistics & Warehousing applications
3. Hands-on Practice: Build Material Handling projects using AM600 hardware
4. Stay Current: Follow InoProShop / AutoShop updates and new Sequential Function Charts (SFC) features
Sequential Function Charts (SFC) Foundation:
Sequential Function Chart (SFC) is a graphical language for programming sequential processes. It models systems as a series of steps connected by tran...
The 4-12 weeks typical timeline for Material Handling projects will decrease as you gain experience with these patterns and techniques. Remember: Verify load presence before and after each move
For further learning, explore related topics including Assembly sequences, AGV systems, and Inovance platform-specific features for Material Handling optimization.