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By Gregory Hale
In a move to combine Emerson’s DeltaV Safety Instrumented System (SIS) with its electronic marshalling and CHARMs technology, the automation supplier is attempting to make safety a much easier system to install and design.

In a week where the automation giant is introducing a slew of new products and upgrades, this new introduction seems to be the top product offering coming out.

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“Electronic Marshalling on the SIS side is a huge deal,” said Peter Zornio, chief strategy officer at Emerson Process Management during a technology roadmap session at the Emerson Global Users Exchange in Anaheim, CA, Tuesday.

The new SIS offering goes toward simplifying design, installation, wiring and commissioning of safety projects. The new logic solver architecture uses electronic marshalling and CHARM technology to eliminate the need for conventional marshalling.

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The safety system brings an integrated, but separate approach where it meets all standards and compliance issues.

The system can act as a standalone SIS solution, or as part of a DeltaV installation. That will mean the system can work with and connect to any DCS out in the market.

“We think it is strong enough to use as a standalone safety system,” Zornio said.

This move will enable users to tackle the complexity of designing, implementing, and operating safety systems. CHARM technology reduces the wiring complexity on plants, the engineering work and the documentation needed and reduces project timescales, improves plant availability, cuts down on the steps design, install, and operate a safety solution.

The new architecture includes:
• The CHARM Smart Logic Solver (CSLS) that runs all safety logic
• New CHARM signal conditioners that replace I/O connections to the logic solver terminal block
• A Local Safety Network (LSN) that communicates between 16 CSLSs
• The SZ controller that communicates between the LSN and the basic process control system (BPCS) control network

The new CSLS provides the same functionality as the existing SLS 1508 logic solver but extends the previous 16 I/O limit per logic solver to 96 I/O CHARM capacity. All inputs are software-assignable to any of the logic solvers on a LSN, dramatically increasing the flexibility of configuration and wiring possibilities. All logic on the network still works within 50 milliseconds.

The CSLS uses the same execution logic as the existing SLS 1508 logic solver and is configurable with the same Control Studio application. Existing SLS 1508 configuration can download directly into the new CSLSs. While all of the safety logic works within the CSLSs, inputs from the safety system can integrate into the plant’s BPCS using the SZ controller to perform additional process control actions and communicate throughout the BPCS.

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