Learning to implement Sequential Function Charts (SFC) for Safety Systems using Emerson's PAC Machine Edition / Movicon NExT / DeltaV Studio is an essential skill for PLC programmers working in Universal. This comprehensive guide walks you through the fundamentals, providing clear explanations and practical examples that you can apply immediately to real-world projects.
Emerson has established itself as High in water/wastewater, food-and-beverage, automotive (legacy GE plants), upstream oil-and-gas (DeltaV), chemicals, power generation, making it a strategic choice for Safety Systems applications. With ~5% global process + PAC global market share and 6 popular PLC families including the PACSystems RX3i and PACSystems RX7i, Emerson provides the robust platform needed for advanced complexity projects like Safety Systems.
The Sequential Function Charts (SFC) approach is particularly well-suited for Safety Systems 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 Safety Systems, including safety integrity level (sil) compliance and redundancy requirements.
Throughout this guide, you'll discover step-by-step implementation strategies, working code examples tested on PAC Machine Edition / Movicon NExT / DeltaV Studio, and industry best practices specific to Universal. Whether you're programming your first Safety Systems system or transitioning from another PLC platform, this guide provides the practical knowledge you need to succeed with Emerson Sequential Function Charts (SFC) programming.
Emerson PAC Machine Edition / Movicon NExT / DeltaV Studio for Safety Systems
Emerson sells the PACSystems PLC line (RX3i, RX7i, RXi, RSTi-EP) inherited from GE Intelligent Platforms / GE Fanuc, programmed in PAC Machine Edition (PME). PME is an IEC 61131-3 environment with the unusual feature of allowing C-language Function Blocks alongside ladder, FBD, ST, SFC, and IL — a holdover from the GE Fanuc lineage that remains popular in legacy-heavy plants. DeltaV is Emerson's process-automation DCS, programmed in DeltaV Studio, separate from PME and aligned to control-module-...
Platform Strengths for Safety Systems:
- Mature PACSystems hardware lineage (RX3i, RX7i, RXi controllers)
- PAC Machine Edition supports IEC 61131-3 plus C-language Function Blocks
- Hot-standby and SIL 3 redundancy options
- Strong process pedigree via DeltaV — same-vendor PLC + DCS story
Unique ${brand.software} Features:
- PAC Machine Edition supports IEC 61131-3 plus C-language Function Blocks
- Hot-standby and SIL 3 redundancy options
- PACSystems RXi for Linux-based open controller deployments
- DeltaV control-module-template engineering for process plants
Key Capabilities:
The PAC Machine Edition / Movicon NExT / DeltaV Studio environment excels at Safety Systems applications through its mature pacsystems hardware lineage (rx3i, rx7i, rxi controllers). This is particularly valuable when working with the 5 sensor types typically found in Safety Systems systems, including Safety light curtains, Emergency stop buttons, Safety door switches.
Control Equipment for Safety Systems:
- Safety PLCs (fail-safe controllers)
- Safety relays (configurable or fixed)
- Safety I/O modules with diagnostics
- Safety network protocols (PROFIsafe, CIP Safety)
Emerson's controller families for Safety Systems include:
- PACSystems RX3i: Suitable for advanced Safety Systems applications
- PACSystems RX7i: Suitable for advanced Safety Systems applications
- PACSystems RSTi-EP: Suitable for advanced Safety Systems applications
- VersaMax (legacy): Suitable for advanced Safety Systems applications
Hardware Selection Guidance:
RX3i is the volume mid-tier PLC; RX7i is the legacy high-end; RXi is the modern Linux-based open controller; RSTi-EP is the compact distributed-I/O controller. DeltaV S-series controllers serve full-DCS deployments. SIL 3 variants exist within each line for safety-critical loops....
Industry Recognition:
High in water/wastewater, food-and-beverage, automotive (legacy GE plants), upstream oil-and-gas (DeltaV), chemicals, power generation. Moderate — legacy GE Fanuc plants in automotive Tier 1 still run PACSystems for body-shop, paint, and trim conveyor sub-systems....
Investment Considerations:
With $$$ pricing, Emerson positions itself in the premium segment. For Safety Systems projects requiring advanced skill levels and 4-8 weeks development time, the total investment includes hardware, software licensing, training, and ongoing support.
Understanding Sequential Function Charts (SFC) for Safety Systems
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 Safety Systems:
- Perfect for sequential processes: Critical for Safety Systems when handling advanced control logic
- Clear visualization of process flow: Critical for Safety Systems when handling advanced control logic
- Easy to understand process steps: Critical for Safety Systems when handling advanced control logic
- Good for batch operations: Critical for Safety Systems when handling advanced control logic
- Simplifies complex sequences: Critical for Safety Systems when handling advanced control logic
Why Sequential Function Charts (SFC) Fits Safety Systems:
Safety Systems systems in Universal typically involve:
- Sensors: Emergency stop buttons (Category 0 or 1 stop), Safety light curtains (Type 2 or Type 4), Safety laser scanners for zone detection
- Actuators: Safety contactors (mirror contact type), Safe torque off (STO) drives, Safety brake modules
- Complexity: Advanced with challenges including Achieving required safety level with practical architecture
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 Safety Systems
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 Safety Systems using Emerson PAC Machine Edition / Movicon NExT / DeltaV Studio.
Implementing Safety Systems with Sequential Function Charts (SFC)
Safety system control uses safety-rated PLCs and components to protect personnel and equipment from hazardous conditions. These systems implement safety functions per IEC 62443 and ISO 13849 standards with redundancy and diagnostics.
This walkthrough demonstrates practical implementation using Emerson PAC Machine Edition / Movicon NExT / DeltaV Studio and Sequential Function Charts (SFC) programming.
System Requirements:
A typical Safety Systems implementation includes:
Input Devices (Sensors):
1. Emergency stop buttons (Category 0 or 1 stop): Critical for monitoring system state
2. Safety light curtains (Type 2 or Type 4): Critical for monitoring system state
3. Safety laser scanners for zone detection: Critical for monitoring system state
4. Safety interlock switches (tongue, hinged, trapped key): Critical for monitoring system state
5. Safety mats and edges: Critical for monitoring system state
Output Devices (Actuators):
1. Safety contactors (mirror contact type): Primary control output
2. Safe torque off (STO) drives: Supporting control function
3. Safety brake modules: Supporting control function
4. Lock-out valve manifolds: Supporting control function
5. Safety relay outputs: Supporting control function
Control Equipment:
- Safety PLCs (fail-safe controllers)
- Safety relays (configurable or fixed)
- Safety I/O modules with diagnostics
- Safety network protocols (PROFIsafe, CIP Safety)
Control Strategies for Safety Systems:
1. Primary Control: Safety-rated PLC programming for personnel protection, emergency stops, and safety interlocks per IEC 61508/61511.
2. Safety Interlocks: Preventing Safety integrity level (SIL) compliance
3. Error Recovery: Handling Redundancy requirements
Implementation Steps:
Step 1: Perform hazard analysis and risk assessment
In PAC Machine Edition / Movicon NExT / DeltaV Studio, perform hazard analysis and risk assessment.
Step 2: Determine required safety level (SIL/PL) for each function
In PAC Machine Edition / Movicon NExT / DeltaV Studio, determine required safety level (sil/pl) for each function.
Step 3: Select certified safety components meeting requirements
In PAC Machine Edition / Movicon NExT / DeltaV Studio, select certified safety components meeting requirements.
Step 4: Design safety circuit architecture per category requirements
In PAC Machine Edition / Movicon NExT / DeltaV Studio, design safety circuit architecture per category requirements.
Step 5: Implement safety logic in certified safety PLC/relay
In PAC Machine Edition / Movicon NExT / DeltaV Studio, implement safety logic in certified safety plc/relay.
Step 6: Add diagnostics and proof test provisions
In PAC Machine Edition / Movicon NExT / DeltaV Studio, add diagnostics and proof test provisions.
Emerson Function Design:
PME FB libraries cover motion, drives, communications, safety. DeltaV control-module library is the central engineering artefact. EPC partners maintain extensive private libraries on both platforms.
Common Challenges and Solutions:
1. Achieving required safety level with practical architecture
- Solution: Sequential Function Charts (SFC) addresses this through Perfect for sequential processes.
2. Managing nuisance trips while maintaining safety
- Solution: Sequential Function Charts (SFC) addresses this through Clear visualization of process flow.
3. Integrating safety with production efficiency
- Solution: Sequential Function Charts (SFC) addresses this through Easy to understand process steps.
4. Documenting compliance with multiple standards
- Solution: Sequential Function Charts (SFC) addresses this through Good for batch operations.
Safety Considerations:
- Use only certified safety components and PLCs
- Implement dual-channel monitoring per category requirements
- Add diagnostic coverage to detect latent faults
- Design for fail-safe operation (de-energize to trip)
- Provide regular proof testing of safety functions
Performance Metrics:
- Scan Time: Optimize for 5 inputs and 4 outputs
- Memory Usage: Efficient data structures for PACSystems RX3i capabilities
- Response Time: Meeting Universal requirements for Safety Systems
Emerson Diagnostic Tools:
PME online mode with breakpoint debug,DeltaV Diagnostics Station,AMS Device Manager for HART instrument health,Movicon NExT SCADA diagnostics,Profinet / EtherNet/IP topology tools,Trace tool with multi-channel capture,Hot-standby pair status diagnostics,Emerson global service desk support,Project-comparison and version-control integration,TÜV functional-safety audit-trail tooling
Emerson's PAC Machine Edition / Movicon NExT / DeltaV Studio provides tools for performance monitoring and optimization, essential for achieving the 4-8 weeks development timeline while maintaining code quality.
Emerson Sequential Function Charts (SFC) Example for Safety Systems
Complete working example demonstrating Sequential Function Charts (SFC) implementation for Safety Systems using Emerson PAC Machine Edition / Movicon NExT / DeltaV Studio. Follows Emerson naming conventions. Tested on PACSystems RX3i hardware.
// Emerson PAC Machine Edition / Movicon NExT / DeltaV Studio - Safety Systems Control
// Sequential Function Charts (SFC) Implementation for Universal
// PME projects in former-GE plants often retain GE-style raw m
// ============================================
// Variable Declarations
// ============================================
VAR
bEnable : BOOL := FALSE;
bEmergencyStop : BOOL := FALSE;
rSafetylightcurtains : REAL;
rSafetyrelays : REAL;
END_VAR
// ============================================
// Input Conditioning - Emergency stop buttons (Category 0 or 1 stop)
// ============================================
// Standard input processing
IF rSafetylightcurtains > 0.0 THEN
bEnable := TRUE;
END_IF;
// ============================================
// Safety Interlock - Use only certified safety components and PLCs
// ============================================
IF bEmergencyStop THEN
rSafetyrelays := 0.0;
bEnable := FALSE;
END_IF;
// ============================================
// Main Safety Systems Control Logic
// ============================================
IF bEnable AND NOT bEmergencyStop THEN
// Safety system control uses safety-rated PLCs and components
rSafetyrelays := rSafetylightcurtains * 1.0;
// Process monitoring
// Add specific control logic here
ELSE
rSafetyrelays := 0.0;
END_IF;Code Explanation:
- 1.Sequential Function Charts (SFC) structure optimized for Safety Systems in Universal applications
- 2.Input conditioning handles Emergency stop buttons (Category 0 or 1 stop) signals
- 3.Safety interlock ensures Use only certified safety components and PLCs always takes priority
- 4.Main control implements Safety system control uses safety-rated
- 5.Code runs every scan cycle on PACSystems RX3i (typically 5-20ms)
Best Practices
- ✓Follow Emerson naming conventions: PME projects in former-GE plants often retain GE-style raw memory references (%I
- ✓Emerson function design: PME FB libraries cover motion, drives, communications, safety. DeltaV control-mo
- ✓Data organization: Structured types in PME for axis status, recipe, and instrument data. DeltaV use
- ✓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
- ✓Safety Systems: Keep safety logic simple and auditable
- ✓Safety Systems: Use certified function blocks from safety PLC vendor
- ✓Safety Systems: Implement cross-monitoring between channels
- ✓Debug with PAC Machine Edition / Movicon NExT / DeltaV Studio: Use PME online mode with breakpoints for IEC POU debug; use C-FB build
- ✓Safety: Use only certified safety components and PLCs
- ✓Use PAC Machine Edition / Movicon NExT / DeltaV Studio simulation tools to test Safety Systems 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
- ⚠Emerson common error: GE-legacy raw-address symbolic conflicts after migration to PME
- ⚠Safety Systems: Achieving required safety level with practical architecture
- ⚠Safety Systems: Managing nuisance trips while maintaining safety
- ⚠Neglecting to validate Emergency stop buttons (Category 0 or 1 stop) leads to control errors
- ⚠Insufficient comments make Sequential Function Charts (SFC) programs unmaintainable over time
Related Certifications
Mastering Sequential Function Charts (SFC) for Safety Systems applications using Emerson PAC Machine Edition / Movicon NExT / DeltaV Studio requires understanding both the platform's capabilities and the specific demands of Universal. This guide has provided comprehensive coverage of implementation strategies, working code examples, best practices, and common pitfalls to help you succeed with advanced Safety Systems projects.
Emerson's ~5% global process + PAC market share and high in water/wastewater, food-and-beverage, automotive (legacy ge plants), upstream oil-and-gas (deltav), chemicals, power generation demonstrate the platform's capability for demanding applications. The platform excels in Universal applications where Safety Systems reliability is critical.
By following the practices outlined in this guide—from proper program structure and Sequential Function Charts (SFC) best practices to Emerson-specific optimizations—you can deliver reliable Safety Systems systems that meet Universal requirements.
Next Steps for Professional Development:
1. Certification: Pursue Emerson PACSystems Certified Engineer to validate your Emerson expertise
2. Advanced Training: Consider DeltaV Certified Professional for specialized Universal applications
3. Hands-on Practice: Build Safety Systems projects using PACSystems RX3i hardware
4. Stay Current: Follow PAC Machine Edition / Movicon NExT / DeltaV Studio 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 4-8 weeks typical timeline for Safety Systems projects will decrease as you gain experience with these patterns and techniques. Remember: Keep safety logic simple and auditable
For further learning, explore related topics including Assembly sequences, Emergency stop systems, and Emerson platform-specific features for Safety Systems optimization.