CHARMs Smart SIS Logic Solver

Introduction

The DeltaV SIS™ process safety system has a uniquely scalable modular architecture that is based on the CHARMs Smart Logic Solver (CSLS) and the unprecedented flexibility and ease of use of the Emerson Electronic Marshalling solution. Each CSLS provides I/O processing, Safety Integrity Level 3-capable logic solving, and diagnostics in a single logic solver.

The CSLS supports up to 96 local individually configurable channels, allowing flexibility for implementing safety instrumented functions and is designed specifically for

multi-core home run cables or field junction box installation. All communications are completely redundant from the channel (LS CHARM) to the CSLS. Integrated HART® I/O brings field diagnostics into the CSLS.

Benefits

Optimized process reliability: Emerson has extended DeltaV Electronic Marshalling technology to safety instrumented systems, with DeltaV SIS being a key component of the Smart SIS Solution. Research shows that more than 90% of all faults in SIS applications occur in field instruments and final elements. The DeltaV SIS process safety system has the world’s first Smart Logic Solver using LS CHARMs. It communicates with intelligent field devices using the HART protocol to diagnose faults before they cause spurious trips. This approach increases process availability and reduces lifecycle costs.

Flexibility to meet project needs: Whether you have an isolated wellhead or a large emergency shutdown (ESD) application, the DeltaV SIS system scales to provide you with the safety coverage you need for your SIL 1, 2, and 3 safety functions. Each CHARMs Smart Logic Solver provides I/O processing, SIL 3-capable logic solving, and diagnostics.

This means that processing power is added as the system expands. If the I/O limit is reached, a CSLS is added increasing memory and processing capacity along the additional I/O. This allows for I/O scalability without impacting the scan rate.

Modularity also provides isolation of safety instrumented functions (SIF). This isolation eliminates single-points of failure for improved availability and safety integrity.

DeltaV SIS components can be added online to facilitate system expansions.

Simplified safety lifecycle management: The DeltaV SIS CSLSs are SIL 3-rated for both simplex and redundant architectures.

Redundant CSLS pairs are installed for increased process availability of your SIFs.

I/O anywhere you need it: The DeltaV SIS CSLS provides an unprecedented flexibility in safety system I/O topology.

Using standard Ethernet infrastructure hardware you can add safety related I/O anywhere you need it. From a local I/O cabinet to remote enclosures miles away, simply install the CSLS and connect it to the Local Safety Network (LSN). Each CSLS directly read the input signals from any other CSLS on the same LSN every 50 ms, the same way as the inputs wired directly to its own LS CHARM system. The distributed CHARMs provides even further flexibility for I/O deployment. For additional details on Electronic Marshalling with Distributed CHARMs, please consult the product data sheet.

Reduces installed cost of system: DeltaV SIS Electronic Marshalling helps reduce overall system costs by eliminating internal cabinet cross wiring, reducing overall footprint, simplifying SIF design, and reducing Factory Acceptance Test (FAT) activities. Electronic Marshalling provides separation between I&E hardware installation schedules and SIF development. Wiring can begin earlier knowing any late changes can be done without lifting a wire. The ability to read any input on the LSN allows more efficient cabinet designs and accommodates late scope changes to add I/O anywhere. Adding additional SIF capacity does not require re-wiring I/O. Simply read the I/O signals from the proper CSLS.

Fully redundant communications: The CSLS architectureis fully redundant. It starts with the two logic solvers on a carrier. The carrier has redundant Safety Network Ports (SNP) for communication with primary and secondary LSN connections. There are two 24V DC input power connections. The carrier connects to the CHARMs base plates providing redundant power and communication buses to the LS CHARMs.

Everything is redundant down to the individual channel.

If required for availability you have the option to use redundant output LS CHARM Terminal Blocks with or without internal 1 A relays for both DTA and ETA service.

Field mounted capable hardware: All components of the CSLS are rated for installation in Class 1/Div 2 or Zone 2 hazardous locations. The extended operating temperature ranges and G3 environment rating allows them to be installed in field mounted junction boxes. This further reduces the footprint required in central equipment rooms, as well as reduces the overall wiring infrastructure of traditional multi-core instrumentation cable.

Plug and Play CHARMs: The DeltaV SIS CSLS has been designed for ease of use, both in physical installation and its software tools. Components snap together with secure DIN-rail latches and interlocking carrier connectors. Attach a series of 96 characterization module (CHARM) to a DIN-rail in a matter of minutes. Insert the LS CHARMs and auto sense the node to create the definition automatically in your DeltaV SIS configuration database. LS CHARMs use a self keying system to automatically set a channel for a specific LS CHARM type. Users cannot mistakenly insert a LS CHARM into the wrong terminal block.

Field power is provided through a redundant 24V DC bus to each LS CHARM. Higher current channels can be powered through the integrated power injection bus local to each CHARM base plate. LS Discrete Output terminal blocks with integrated relays are also available.