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MAY-JUN 2018

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INTECH MAY/JUNE 2018 41 ISA Certified Automation Professional (CAP) program ISA Certified Control Systems Technician (CCST) program Certification Review | association news CAP question Identify three levels within the manufac- turing computer systems hierarchy. A. operating system, machine interface, Internet B. planning, execution, device control C. MRP II, planning, enterprise requirements D. inventory, movement, planning CAP answer The correct answer is B, "planning, execution, device control." The manu - facturing computer systems hierarchy is defined in ISA-88 and ISA-95 by Level 0 through Level 4. Level 4 encompasses the business planning and logistics ac - tivities, such as the basic plant opera- tions schedule, inventory, and shipping requirements. Activities at Level 3 are concerned with manufacturing operations management. These are the activities related to the execution of recipes and production work- flow and creating operations records. Levels 1 and 2 are focused on device control, whether it is batch, continuous, or discrete control. Answer A only lists hardware and software used at each level where computers are used. Answers B and C are all activities found at Level 3 of the hierarchy. Reference: Trevathan, Vernon L., A Guide to the Automation Body of Knowledge, Second Edition, ISA, 2006. CCST question According to ISA-5.1, the following P&ID symbol represents which kind of device? A. Pitot tube B. magnetic flowmeter C. damper valve D. constant flow regulator CCST answer The correct answer is D, "constant flow regulator." The symbol for the constant flow regulator is a compound symbol made from the symbol for a variable area flowmeter (FICV) with an integral manual adjusting valve adjacent to a control valve symbol. The line above the two symbols indicates that the valve uses the flow signal to adjust the valve position, and hence, maintain a constant flow rate. The symbols for the other three items are: Pitot tube: Magnetic flowmeter: Damper valve: Reference: Goettsche, L. D. (Editor), Maintenance of Instruments and Systems, Second Edition , ISA, 2005. Certified Automation Professionals (CAPs) are responsible for the direction, design, and deployment of systems and equipment for manufacturing and control systems. Certified Control System Technicians (CCSTs) calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. FICV M

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