Quality New Honeywell TK-FPDXX2Module

Introduction

Unlike earlier safety standards, the international standards ANSI/ISA S84.01 and IEC 61508 do not only focus on the safety system (called “logic solver”, e.g. Safety Manager), but also demand compliance of the field equipment to the Safety Integrity Level (SIL) of the control loop. This may not always be possible. The control loop, for example, may be rated SIL3, whereas a transmitter that measures one of the loop input variables is only suited for SIL1 and SIL2. In such cases, the required level of safety can be realized by using multiple sensors or transmitters. Safety Manager supports multiple input configurations for digital and analog input signals. The multiple-input function allows the use of two or three sensors or transmitters to measure the same process quantity. The resulting process value is fed to the control program on the basis of one of the available standard matching algorithms, e.g. 2-out-of-3 (2oo3). Safety Manager monitors if discrepancies occur between the values obtained from the independent sensors or transmitters, and reports any detected faults through its diagnostics. The diagnostic status is also available to the control program.

HoneywellField Termination Assemblies FTA Models

Original And New