ABB TZIDC / TZIDC-200 Digital Positioner

Additional instructions for

IEC 61508 compliant devices

from HW Rev. 05.xx

Introduction

Safety Manual for TZIDC / TZIDC-200 digital

Positioner.

The TZIDC / TZIDC-200 is an intelligent digital

positioner for communication via HART within the

positioner product range.

Application area

The TZIDC is an electronically configurable 2-wire 4 to 20 mA valve positioner with HART® communication capabilities designed for

mounting on pneumatic linear or rotary actuators.

The TZIDC-200 is a variant designed with a flameproof enclosure as explosion protection concept.

The integrated I/P module with subsequent pneumatic amplifier is used to control the attached pneumatic actuator.

The SIL Safety Function is intended to open or close actuator/valves assemblies as emergency application.

By providing 0 mA as control/setpoint signal the positioner depressurizes the fail-safe actuator which return spring moves the valve

to a predefined, safe end position (either OPEN or CLOSED).

Figure 1 is demonstrating the safety instrumented function as example on a Tank Overfill Protection.

The TZIDC pneumatic system can be supplied in four versions: for single acting or double acting actuators and each with the ‘fail

safe’ or ‘fail-freeze’ safety behavior.

The SIL Safety Function is limited to the version: ‘single-acting, fail safe‘ in conjunction with pneumatic fail-safe actuators with

spring-return mechanism.

The table below is demonstrating the safety instrumented functions provided by ABBs Positioner TZIDC & EDP300 as informational

comparison:

The order variant ‘CS2 – SIL 2 Declaration of Conformity‘ is capable to meet the SIL safety requirements for the integration in Safety

Instrumented Systems in compliance to IEC 61508-2 within the process industry sector according to IEC 61511.

The area of safety applications is limited to:

• up to SIL 2

• as Low Demand Mode of operation

with further constraints as stated within this safety manual.

In case of questions and detected safety critical device failures please contact the ABB Customer Service Center by stating the

´Product Type Designator´ and ´Functional Safety SIL´ as request headlines.