Buhler PLC Programmer Interview Questions and Answers for Experienced

Q1. Substation related questions
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Q1. Salary Negotiation
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Q1. Basic of Electrical engineering and presence of mind
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Q1. Communication between PLC controllers and DCS
Ans. 
Communication between PLC controllers and DCS involves establishing a reliable connection for data exchange.
• PLC controllers and DCS communicate through various communication protocols such as Modbus, Profibus, Ethernet/IP, etc.

• Data is exchanged between PLC controllers and DCS for process control and monitoring.

• Communication can be bidirectional, allowing both systems to send and receive data.

• Proper configuration and pr...read more
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Q2. PID tunning and control
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Q1. Why do you wanna join ABB
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Q2. What make you chose abb over other companies
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Q1. Previous experience and project related technical questions.
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Q2. Basic Electrical engineering questions from previous experience
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What is the meaning of NPSH?

Q1. Introduce yourself briefly?
Ans. 
I am a highly skilled and experienced Project Engineer with a strong background in managing complex engineering projects.
• Over 10 years of experience in project management and engineering

• Proficient in utilizing project management software and tools

• Strong leadership and communication skills

• Proven track record of successfully delivering projects on time and within budget

• Experience in coordinating with cross-functional tea...read more
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Q2. What projects you have done in previous company
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I have worked on various projects in my previous company, including the construction of a new office building and the implementation of a software system for project management.
• Construction of a new office building

• Implementation of a software system for project management
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Q3. What is lifecycle of project
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The lifecycle of a project refers to the stages it goes through from initiation to closure.
• Initiation: project is defined and approved

• Planning: project objectives, scope, and resources are determined

• Execution: project plan is put into action

• Monitoring and Control: project progress is tracked and necessary adjustments are made

• Closure: project is completed and evaluated

• Examples: construction of a building, development of...read more
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Q4. What are the industrial communication protocols
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Industrial communication protocols are standards for data exchange between devices in industrial automation and control systems.
• Some common industrial communication protocols include Modbus, Profibus, DeviceNet, Ethernet/IP, and CANopen.

• These protocols enable devices from different manufacturers to communicate with each other and exchange data.

• Industrial communication protocols can be wired or wireless, and can operate...read more
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Q5. What are the settings required in MODBUS
Ans. 
MODBUS settings include baud rate, parity, data bits, stop bits, and slave address.
• Baud rate determines the speed of communication between devices.

• Parity is used for error checking and can be set to even, odd, or none.

• Data bits determine the number of bits used to represent each character.

• Stop bits indicate the end of a character and can be set to 1 or 2.

• Slave address is used to identify the device on the network.

• Examp...read more
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Q6. Maximum speed in modbus
Ans. 
The maximum speed in Modbus depends on the baud rate and cable length.
• Modbus speed is measured in baud rate

• Higher baud rates allow for faster data transfer

• Cable length can also affect the maximum speed

• For example, at 9600 baud rate, the maximum cable length is 1200 meters
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Q7. How many device add in modbus
Ans. 
The number of devices that can be added in Modbus depends on the network architecture and the number of available addresses.
• The maximum number of devices that can be added to a Modbus network is 247.

• The number of available addresses depends on the type of Modbus protocol used (RTU or TCP/IP).

• The network architecture also plays a role in determining the number of devices that can be added.

• It is important to ensure that ...read more
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Q8. Types of modbus communication
Ans. 
Modbus communication types include RTU, ASCII, and TCP/IP.
• RTU (Remote Terminal Unit) is a serial communication protocol that uses binary code to transmit data.

• ASCII (American Standard Code for Information Interchange) is a serial communication protocol that uses ASCII characters to transmit data.

• TCP/IP (Transmission Control Protocol/Internet Protocol) is a network communication protocol that uses Ethernet to transmit d...read more
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Q9. On which scada you are worked
Ans. 
I have worked on multiple SCADA systems including Wonderware, Ignition, and Inductive Automation.
• I have experience with configuring and programming SCADA systems

• I have worked with Wonderware, Ignition, and Inductive Automation

• I am familiar with creating HMI screens, alarms, and trends

• I have experience with PLC communication and data acquisition

• I have worked on projects in various industries including manufacturing and
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Q10. What is maximum Input output handle
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The maximum input output handle refers to the maximum number of inputs and outputs that a device can handle.
• The maximum input output handle varies depending on the device and its specifications.

• It is important to consider the maximum input output handle when selecting a device for a project.

• For example, a PLC may have a maximum input output handle of 256 inputs and 256 outputs.

• Another example is a microcontroller with ...read more
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Q11. How many pages designed in HMI
Ans. 
The number of pages designed in HMI depends on the project requirements and complexity.
• The number of pages can range from a few to hundreds depending on the project scope.

• The complexity of the HMI design and functionality also affects the number of pages.

• Factors such as user interface, data visualization, and system integration can impact the number of pages.

• It is important to prioritize user experience and ease of nav
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