SPONSORED FEATURE Cover story
EC 61511 Functional Safety has gained acceptance across global industrial processing, mining, and manufacturing sectors. At the heart of this standard are prescriptive guidelines revolving around Safety Instrumented Systems (SIS) that mitigate risks to protect personnel, facilities, and the environment. Each SIS includes one or more Safety Instrumented Functions (SIFs) that help ensure safe operation. The logic solver, a crucial component of each
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SIF, determines when dangerous conditions exist and executes actions that mitigate unwanted or unsafe conditions. Currently, a large gap exists between simplex and complex logic solvers – as it relates to point/loop count, complexity requirements, and cost. Low point count logic solver requirements are often handled with single loop logic solvers while larger safety systems with high point counts are tackled with larger and costly safety PLCs.
In response to the rapidly growing demand by process engineers for cost-effective and compact logic solvers with built-in voting capability for plant-critical Functional Safety applications, Moore Industries has introduced the SLA Multiloop and Multifunction Safety Logic Solver and Alarm. As part of the Moore Industries FS Functional Safety Series, the SLA is designed and built from the ground up to IEC 61508:2010 standards and is exida certified for use in Safety Instrumented Systems (SIS) for systematic integrity up to SIL 3 and for random integrity up to SIL 2. The SLA performs as a multiloop logic solver with built-in voting and enhanced math capability typically found in costly and complex safety PLCs. This allows the SLA to handle everything from simple alarming to more complex schemes that include 1oo2, 2oo3 or even 5oo8 voting architectures, enabling it to act on hazardous risk mitigation; warn of unwanted process conditions; provide emergency shutdown; or provide on/off control in Safety Instrumented Systems and traditional alarm trip applications.
The 4-wire (line/mains powered) SLA accepts up to four discrete and six analogue inputs from a wide array of devices and sensors. HART data from connected field devices is passed through the SLA to its analogue outputs enabling connected hosts and asset managers bi- directional communication for continuous monitoring and programming. Its four relay outputs and up to four discrete contact closure outputs can be driven by any of 16 internally
configured alarms, where individual or multiple alarms can be assigned to each relay or discrete output. Relay and discrete outputs can also be triggered by
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CHOOSING THE RIGHT LOGIC SOLVER BALANCING COST AND FUNCTIONALITY
any input or
internal diagnostic fault. Three
optional analogue outputs allow transmission of any input or internally calculated equation or
variable. The SLA is easily
programmable with any FDT compliant host utilising the SLA’s DTM with simple drop-down menus and checkboxes; no custom or licensed software is required. This ease-of-use functionality includes a powerful equation editor that the user can employ to create monitoring, alarming, and control schemes involving simple to complex equations using timers, running min/max functions, prebuilt analogue and discrete logic functions and more.
The SLA is made for
today’s industrial networks, featuring secure programming and communications with security jumpers that can be set to prevent unauthorised reprogramming and ensure read-only communications through the Ethernet and MODBUS ports. It supports MODBUS/TCP
and MODBUS RTU industrial protocols and has an embedded read-only web server that allows all inputs, outputs, internal variables and various other parameters to be read with a simple web browser.
The SLA is exida certified to IEC 61508:2010 for
systematic integrity up to SIL 3 and for random integrity up to SIL 2. This means the SLA is approved for single use in safety applications up to SIL 2 and in a redundant architecture (1oo2, 2oo3, etc.) up to SIL 3. FMEDA certified safety data is available upon request allowing a functional safety practitioner to access the FMEDA data on the SLA to determine the SLA’s applicability in specific safety-related applications. The Moore Industries SLA Multiloop and Multifunction Safety Logic Solver and Alarm is designed and built to expand the capabilities of our existing line of Functional Safety logic solvers that provide cost-effective and dynamic alarming solutions for safety loops. Utilising its FDT/DTM programming interface, as opposed to proprietary, expensive and licensed software, safety practitioners can efficiently employ the SLA and take full advantage of its powerful application capabilities for Safety Instrumented Systems and process loops.
Moore Industries
www.miinet.com January 2024 Instrumentation Monthly
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