Answer / maulik vyas

marshalling panels are used as interface between field
junction box & dcs control panel..

It also isolates the dcs panel from feild control panel..

Answer / kkrameshkumar

Marshalling means grouping of I/Os. Marshalling panel is
placed between the DCS system panel and field instruments.
In marshalling panel grouping of I/Os like Analog Input,
Analog Output, Digital Input, Digital Output and Pulse I/O
are done.From marshalling panel the I/O signals are
communicated to the system CPU/Controllers through
Isolation/Signal conditioners.

In marshalling panel we can easily identify the Input or
Output and easy diagnosis can be done in case of fault
finding.

Answer / rajkumar

in addition to maulik points
3. marshalling cabinets location-- if located exactly will
save much cable cost and easy for maintenance people to
trace out cable routing and fault finding

Answer / muhammad fawad azim

FUNCTIONS:
Signal conditioning, termination, signal isolation, cold
junction compensation, field device power supplies.

Answer / rodney

There is a more practical reason for using a Marshalling Panel which becomes apparent if we imagine a multi-cable coming from the field and being connected directly to the I/O cards of a DCS. Whenever some kind of maintenance/test/check has to be performed just imagine the risk of interfering directly at an I/O card just to open some loop circuit. There would be the risk of touching another entry , loosing some bolt, and many other situations that could jeopardize the whole I/O card for some lack of other space specifically created to allow the proper access for maintenance and testing - the Marshalling Panel. Once the connections between all the I/O cards and a Marshalling Panel are done, tested and identified, no one wil have to deal with the I/O panel again, which means less risk and a proper place to do maintenance and testing, for there will be proper open/close connectors, fuses, isolators and all that the Project specifies.

Determine the manipulated variable, controlled variable, and the measured variable given a description of various typical industrial processes.

6 Answers   Honeywell,

IS THEIR ANY AGEING EFFECT ON FLOW NOZZLE, ORIFICE, MANIFOLD, OR TRANSMITTER ?

1 Answers  

In RTU Panel we are having several Analogue & Digital Inputs /Outputs. We are recently facing some problems over Analog inputs , which are not updating properly (But Digital Input are updating normally) Can any one tell me from where the problem is creating , we have checked PLC CPU card, Analog Input card & we reconfigured ,But still the issue is there. Issue : 1. Sometimes Analog values are updating & sometimes not. 2. Analog values are not updating normally , showing some wrong Values 3. Total dead (0 value) Analog values are Level & flow measurement from the field instruments. (But in field the instruments are working normally & Displaying the values normally in local display unit) This problem we are facing in our Water Plant. If any one experienced this same problem or having any ideas related to our issue PLS send your valuable Answers/Replies...

6 Answers   L&T,

can we connect instrument earth pit to electrical earth pit, if not why?

2 Answers  

1. what is 3 point calibration & 5 point calibration? 2. If we use hart communicator to set the LRV & URV of a smart transmitter, did we calibrate the transmitter? why? 3. Make a complet list if meterials needed to properly connect a pressure gauge to a steam pipe using 1/2 inch stainless steel tubing. The gauge connections is 1/2 inch NPT-M and the steam pipe tap has a 1/2 inch female coupling, compression fittings are use. 4. What are the tools in loop checking? 5. What would the ISA symbol of a square root extractor look like? 6. What would you do to completely prepare for the configuration? 7. What safety measures must you undertake when doing configuration? 8. what are the two most commonly use programming languages used when we configure a PLC? 9. What would you do if you accidentally skipped a step in the configuration procedure? 10. How would you know if the configuration were sucessful? 11. Name at least 3 selections available when we configure the burnout protection of a controller?

3 Answers   EI Electrotechnical Institute,

what is the zero elevation and zero supresstion in level measurement, how can use it?

2 Answers   GAIL,

Transducer Input 0 to 230 v ac Output-0 to 10vdc Receiver Input 0 to 10 vdc and Output 4 to 20 ma How?

1 Answers  

How to Calibrate Radar Level Transmitter in Field

0 Answers  

What are different types of control valves?

0 Answers  

what is the difference between Digital output DO signals /Commands for start/stop and Solenoid valves ??

1 Answers  

what is the meaning of Domain server?

2 Answers  

what is Pre- commissioning.

5 Answers   Saipem, Takreer,