Enhanced SIS for greater system configuration efficiency

27 October 2015

Yokogawa Electric Corporation is set to introduce an enhanced version of its ProSafe RS safety instrumented system (SIS) to meet the growing demand for SISs that are able to detect abnormal conditions and safely initiate emergency shutdowns.

The latest version, R4.01, features an expansion of the company’s lineup of I/O devices and introduces crucial new SIS components. In addition, the FieldMate Validator software has been enhanced to work with the latest version of ProSafe-RS.

With R4.01, plant operators can be assured of an optimum engineering environment that spans the entire plant lifecycle, from plant design and the engineering and installation of systems and devices to the start-up of production, maintenance, and renovation, says the company.

Features include field I/O device with smart configurable I/O that can handle multiple types of I/O signals. SISs rely on field I/O devices for the transfer of data to and from sensors, valves, and other types of field instruments. Using this data, they are able to detect abnormal conditions and safely initiate emergency shutdowns. Depending on the instrument model, the type of electric signal used to transfer this data varies. With a conventional FIO device, a compatible I/O module is needed for each signal type.

The N-IO field I/O device developed for use with ProSafe-RS fulfills the functions of smart configurable I/O, enabling software marshalling and flexible I/O assignment. It has an I/O module that accommodates multiple I/O signal types and allows configuration of an individual signal type for each point. Both analogue and digital I/O signals, which account for the majority of I/O signal traffic, can be handled solely through software settings. With the N-IO, it is not  necessary to replace the I/O module, reducing the amount of rewiring required when changing sensor types and/or layouts during a plant revamp..

In addition, Yokogawa has signed OEM agreements with Pepperl+Fuchs GmbH and MTL Instruments Group Limited under which Yokogawa will receive baseplates and market them as its own products. These will be used in combination with the company's N-IO modules and intrinsic safety (IS) isolators procured from the two companies. 

Upon installation of a field instrument and completion of all wiring, the wiring must be checked. Until now, such verification could only be conducted using the SIS's engineering screen, which required engineers to wait for all field I/O devices to be installed and the entire SIS, including all operation/monitoring stations and system controllers, to be set up.

The N-IO loop commissioning software, which is used to verify the wiring and relevant operations for any newly installed field instrument or field I/O device, has been modified to support ProSafe-RS R4.01. When the FieldMate Validator software tool establishes a connection with an N-IO device, it can check in real time the wiring of all field instruments, based on the control loop I/O information in the SIS's application software, to verify that they are operating correctly. 

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