Certiﬁcation Review | association news
Documenting skills is value-add
ISA certiﬁcation provides an objective, third-party assessment, and conﬁrmation of a person’s skills. It gives manufacturing and fac-
tory staff the opportunity to differentiate themselves from their peers and gain recognition. InTech covers two certiﬁcation areas in
this monthly Certiﬁcation department.
ISA Certiﬁed Automation Professional (CAP) program
Certiﬁed Automation Professionals (CAPs) are responsible for the CAP answer
direction, design, and deployment of systems and equipment for The correct answer is B, 16-bits.
manufacturing and control systems. Common Modbus uses two 8-bit bytes for each data register.
The following question comes from the CAP study guide, Per- Two × 8 bits = 16 bits
formance Domain III, System Design, Design, specify, and pro- To achieve more precision, special programming or a special-
cure the hardware/software used in the system ized version of Modus would be necessary. Eight-bits are less pre-
cise than 16-bits. 24-bits and 32-bits require uncommon means
CAP question to achieve.
Using Modbus, what is the MAXIMUM level of precision Recall a “bit” is a binary digit, taking a value of either 0 or 1.
available? Binary digits are a basic unit of information storage and commu-
A. 8-bits nication in digital computing and digital information theory.
B. 16-bits Reference: Bela Liptak, Instrument Engineers Handbook - Volume
C. 24-bits 3 (3rd Edition). Process Software and Digital Networks, ISA, 2002
ISA Certiﬁed Control Systems Technician (CCST) program
Certiﬁed Control System Technicians (CCSTs) calibrate, docu-
ment, troubleshoot, and repair/replace instrumentation for
systems that measure and control level, temperature, pressure,
ﬂow, and other process variables.
This question comes from the Level I study guide, Domain 3,
Troubleshooting. Level I represents a professional who has a ﬁve-
year total of education, training, and/or experience.
A plant has a water tank mounted on top of an 80-feet platform.
The tank is 30 feet high. What is the level of water in th