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.

Operational amplifiers

0 Answers   CCIE,

---

What is the procedure of changing a Faulty Module of Allen Bradley PlC without stopping the Process

1 Answers   Siemens,

---

what is performance test.need defination

0 Answers   Takreer,

---

Can any body tell me about SAP MAINTINANCE MODULE. WHAT IS its function and application. And study material Source about it. I shall be very thankful.

0 Answers  

---

What are three main programming in PLC

5 Answers  

---

WHICH INSTRUMENT USED TO CALIBRATE CONTROL VALVE?

8 Answers  

---

I have observed in field instrumentation work... I remove the fuse of an analog transmitter then it shows 7.75 kg/sq cm (which is practically wrong value)in DCS and when put the fuse it shows 0 in dcs. Then cheach the field transmitter termination and found moister. clean that and then it shows 1.1 kg/ sq cm which is right value. Please describe the above phenomenon.

1 Answers  

---

role of electrical engineer in the instrumentation industry

1 Answers  

---

please give me the syllabus and sample questions if possible for Instrumentation for Vizag Steel plant MT (Trainee) 2009 exam

1 Answers   Pedvak, Steel Plant, Vizag Steel,

---

what is reset windup in integral control?

6 Answers   Honeywell,

---

Basically iam Instruemntation Engineer, but Iam interested in Instruments design engineering, so plz guide, is there any course, training or Softwres to become Instrument design engineer??.

0 Answers   Honeywell, Tata Steel Limited,

---

Name some of the common protocol use in automation.

3 Answers   Empower,

---