Answer / sachin patel

PLC is the Solid State device. Which is used in Discrete &
Sequential logic in which Timer, Counter, Relay in the form
of Software Called the PLC.
It is two type- 1- Compact or Non modular plc.
2- Modular plc.
* In compact PLC I/O are fixed (Allenbradilly,
Seimeance,Mitshubishi plc )
* In Modular PLC I/O are Increase. (SLC- Sequential logic
controller).

DCS is the Distributed Control system. It is advance of the
PLC. It is used in Big Industry. In DCS I/O is nearly 1 lakh.

HMI- It is a Human Machine Interface.It is used for field
instrument control.

Answer / ghanshyam khatri

plc is programmable logic control ,plc is used in small
application,it is works on small program which is created
in computer then send to plc.plc have memory to store this
programme and then perform.
hmi is human machine interface,hmi is used for smaller
appliction then plc.
dcs stand for distributed control system this is used for
big plants(for larger amount of i/o)

main diffrence in plc n dcs is
1.in dcs we can change programme during it is working,this
is not possible in plc.
2.in dcs trend and history is available.

plz send me placement paper of ongc

0 Answers   ONGC,

---

a flow transmitter [range-0-400mbar] connected in process line. please explain me how to calibrate the flow transmitter , & how to do static error

0 Answers   L&T,

---

explain Cascade Control strategy with the help of a block diagram. also exlain its working in a distillation column

2 Answers   ABB, Sabic,

---

diff c and c++

1 Answers  

---

what is the square root flow transmitter formulla ?

2 Answers  

---

---

what is the use of shield cable?

2 Answers  

---

what is fire and gas system?

2 Answers   Andhra Petrochemicals Limited,

---

How can you add value to this Industry if offered the job?

0 Answers   SNS,

---

could someone explain for me what is 32-bit Floating Point ? Thanks

1 Answers  

---

WHY THE DEGREE OF VALVE PLUG AND VALVE SEAT IS SLIGTLY DIFFERENT I CONTROL VALVE TRIM DESIGN

0 Answers  

---

when the force applied on load cell the ohms will be varriying .and how its convert ohms to mv generate and have any formulae?

1 Answers   UETCL Uganda Electricity Transmission Company Limited,

---

What is maintenance planning?

3 Answers   Qatar Airlines,

---