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 to calibrate transmitter

3 Answers   Sabic,

---

A PLC is programmed to drive three motors A, B and C as follows : After running motor A for an hour, motor B should get ON and motor A should get OFF. And after running motor B for an hour, motor C should get ON and motor B should get OFF. And after running motor C for an hour, motor A should get ON and motor C should get OFF. (That is, a cyclic repetition with time period one hour) Now, the second condition is: If any motor gone faulty and is tripped, the consecutive motor should get ON and the faulty (tripped) motor should be eliminated from cyclic repetition. The remaining two motors should bear the cyclic repetition of one hour each. (For healthy motor take logic as high and for tripped motor take logic as low) Now, the third condition is: When motor A load(Amps) exceeds 60% of its rated load, motor B should get ON in parallel to motor A. And when both motors A & B are running in parallel, and if their load exceeds 60% of their rated load, motor C should also start in parallel to A & B. [Here the cyclic repetition is eliminated, until their loads become normal(40%)] [Take logic high(1) for load at 60% and logic low(0) for load at 40%] Now draw a flow chart or a ladder diagram to fulfill the above condition.

0 Answers   MNC,

---

How to find out turn down ratio of Pressure transmitter?

1 Answers  

---

what is the working principle of hydra step(electronic level indicator)?

2 Answers   Bengal Energy, Lanco,

---

plz exlain the dcs system of ABB sympony hamnony

1 Answers  

---

I want to know about DDCMIS in detail ? please explain it. Also give name of reference books in which it is explained in detail in very simple manner.

0 Answers  

---

what is mean of 3 by 2 automation ?

5 Answers  

---

So I'm a first year apprentice and I'm having a tough time with knowing the difference between AI, AO, DI, DO. I'm having a hard time understanding what devices are which and why. Can someone explain this to me?

2 Answers  

---

In bimetallic temp. Gauges why does metal strip bend? Why do we use low expansion factor metal and high expansion factor metal in bimetaliv strip?

1 Answers   Process Control Technologies,

---

how to work gas chromatography explain principle ?

2 Answers  

---

Type of level transmitter commnly used in Procees area are the following. a.________________This type of level transmitter works as follows

0 Answers  

---

what is wave length were using ?

0 Answers  

---