SEP-OCT 2017

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INTECH SEPTEMBER/OCTOBER 2017 39 CAP question Which of the following explains why ANSI/ ISA-88.01-1995 (S88) treats control mod- ules as a separate entity? A. A control module is inextricable from its equipment. B. Each control module is encapsulated so it can be reused. C. Each control module has a phase and directs a set of final control elements. D. A control module is partitioned to prevent the phase from commanding other control modules within an equipment module. CAP answer The correct answer is B , each control module is encapsulated so it can be reused. One of the major document - ed benefits of ISA-88 is its definition of separate equipment module and control module functions. This allows code for a single control module, for example, a two-way on/off valve, to be programmed, validated, and then reused for each instance of a two- way on/off valve in the process. These reusable control modules streamline code development, simplify documen - tation, and allow for consistent opera- tor interactions. Reference: Trevathan, Vernon L., A Guide to the Automation Body of Knowledge, Second Edition, ISA, 2006. ISA Certified Automation Professional (CAP) program Certification Review | association news Certified Automation Profession- als (CAPs) are responsible for the direction, design, and deploy- ment of systems and equipment for manufacturing and control systems. Certified Control System Techni- cians (CCSTs) calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. ISA Certified Control Systems Technician (CCST) program CCST question To measure current in a circuit, without a clamp on probe, you must measure in ______, and the circuit must be _______. A. parallel, de-energized B. series, de-energized C. parallel, energized D. series, energized CCST answer The correct answer is D , series and en- ergized. To measure current, you must connect the two leads of the ammeter in the circuit so that the current flows through the ammeter. In other words, the ammeter must become a part of the circuit itself. The only way to mea - sure the current flowing through a simple circuit is to insert your ammeter into the circuit (in series) with the circuit energized. Reference: Goettsche, L. D. (Editor), Main- tenance of Instruments and Systems, Sec- ond Edition, ISA, 2005.

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