Answer / suresh agravat

Modbus is a popular communication protocol used for transmitting data between devices. Here's how signals can be taken through Modbus:

*Modbus Basics:*

1. *Master-Slave Architecture*: Modbus uses a master-slave architecture, where one master device communicates with multiple slave devices.
2. *Registers*: Modbus devices store data in registers, which can be read or written to.
3. *Function Codes*: Modbus uses function codes to specify the type of operation (e.g., read or write) and the type of register (e.g., coil or holding register).

*Signals through Modbus:*

1. *Analog Signals*: Modbus can transmit analog signals, such as temperature, pressure, or flow rate, by reading or writing to specific registers.
2. *Digital Signals*: Modbus can transmit digital signals, such as on/off or status signals, by reading or writing to coil registers.
3. *Data Types*: Modbus supports various data types, including:
- *16-bit integers*: Used for analog signals or digital signals with a limited range.
- *32-bit integers*: Used for larger analog signals or digital signals with a wider range.
- *Floating-point numbers*: Used for precise analog signals.

*Modbus Registers:*

1. *Coil Registers*: Used for digital signals, such as on/off or status signals.
2. *Holding Registers*: Used for analog signals or digital signals with a wider range.
3. *Input Registers*: Used for reading analog signals or digital signals.

*Modbus Communication:*

1. *Serial Communication*: Modbus can be transmitted over serial communication protocols, such as RS-232, RS-485, or RS-422.
2. *TCP/IP*: Modbus can also be transmitted over TCP/IP networks, using Modbus TCP.

*Common Modbus Applications:*

1. *SCADA Systems*: Modbus is often used in SCADA (Supervisory Control and Data Acquisition) systems for monitoring and controlling industrial processes.
2. *Industrial Automation*: Modbus is used in industrial automation applications, such as process control, motor control, and monitoring.
3. *Building Automation*: Modbus is used in building automation systems for controlling and monitoring HVAC, lighting, and security systems.

By understanding how Modbus works and how signals can be transmitted through it, you can design and implement effective communication systems for your industrial or building automation applications.

How can we say that accuracy of measurement increases by using 3 or 4 wire RTD? because for example: If resistance of RTD element is say r ohms and Resistance of the cable from transmitter to RTD is R ohms And if 4 wire RTD is used, ____._____________________ R ohms | |_____._____________________ R ohms / \ / r ohms \ \ | |______.__________________ R Ohms | |_______._________________ R ohms Then the actual resistance measured will be: Total = r + R/2 + R/2 = r +R Ohms Note: r+R instead of r ohms. hence error

2 Answers  

---

How to do calibration of magnetic flowmeter

1 Answers   Kharafi National,

---

What is the difference between pneumatic and electro pnematic positioner?

3 Answers   TCS,

---

Please any one can provide latest aptitude test,technical test and interview questions for tata consulting engineering (TCE) i need it asap thanks in advance

0 Answers   TCE,

---

What different types of problems do occur while doing the loop checking? and please explain in detail or mail me at kadam.aniket143@gmail.com

1 Answers   Operational Energy Group, Process Control Technologies,

---

hi... i'm about to learn siemens plc i came across following question in my mind ... plr ans 1. hw motor operated by plc 2. hw drive operated by plc explain dis by both ladder logic diagram and hardware config , connection

2 Answers   KCP Cements,

---

what is the difference between magnetic flow meter and mass flowmeter

0 Answers  

---

How to Calibrate Transducers? Can you give me a step by ste procedure?

1 Answers  

---

Who to difference between analog in & analog out in dcs?

0 Answers  

---

State bernoulli’s application.

0 Answers  

---

Please asked me How calculate DCS controller memory.

0 Answers   Yokogawa,

---

PLS TELL ME THE FUNCTION OR PRINCIPLE OF CREEP RELEIF VALVE..

3 Answers  

---