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Participant

Join Date: Jul 2017
Posts: 3

I/O Type for Instrument Index

07/19/2017 8:34 PM

Is the I/O type for the below correct?

1. Motor Operated Valve (MOV)

Tag Number

Loop

Instrument Type

I/O type

System

MOV-001 M-001 Motor Operated Valve - -
HS-001 M-001 MOV Local/Off/Remote DI SIS
ZA-001 M-001 MOV Battery low alarm DI PCS
ZSC-001 M-001 MOV Limit switch close DI SIS
ZSO-001 M-001 MOV Limit switch open DI SIS
HSX-001 M-001 MOV Local Handswitch - -

2. VFD

Tag Number

Loop

Instrument Type

I/O type

HS-001 V-001 HOA Switch DI
XC-001 V-001 Pump Start DO
XS-001 V-001 Pump Run Status DI
XY-001 V-001 Permissive DI

What is the I/O for Accelerometer?

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Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19464
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#1

Re: I/O type for Instrument Index

07/19/2017 8:52 PM

"Instrument Index

First and foremost things to be prepared on any Control and Instrumentation job is to prepare Index of all the instrument needed for the for the job. As any other index for book or website it gives a tabulated summarized view for all the instruments their type and basic information related to those information which further detailed in their respective spec sheets. Basic Instrument Index must contain the following things

  • Tag Number:- Unique (Key in most of the Instrument database)
  • Service:- Briefly describes process for which Instrument is used.
  • Instrument Type:- Tells about the basic type instrument.
  • Loop Name:- Loop name or number to which instruments belong to.
  • I/O Type:- Signal Input /Output type i.e Analogue Input,Digital Output , Fieldbus etc
  • Equipment System:- The Automation system to which the instrument belongs to. e.g DCS,MCMS etc
  • Location:-Contains information regarding where the tag/instrument is in the plant. eg Field, DCS PIB Building etc
  • Datasheet Number:- The form/document number in which the specifications of the instrument/Tag can be found.
  • P&ID Drawing:- The piping and instrumentation drawing on which the instrument/tag is represented.
  • Line number:- The Pipeline on/in which the instrument/tag is installed or associated to.
  • Equipment Number:-The Equipment number on/to which the instrument/tag is associated with.
  • Status:-The field which describes whether Tag/instrument is NE,EXISTING,HOLD or DELETED basically the status of the Tag/instrument.
  • HookUp/Installation Drawing:-The field basically contains reference to drawing/document number which give details of installation."

http://controlninstrumentation.blogspot.com/p/blog-page.html

https://www.slideshare.net/QuESTGlobal/detail-engineering-instrumentation-and-controls-for-oil-gas-industry

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Participant

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Posts: 3
#2
In reply to #1

Re: I/O type for Instrument Index

07/19/2017 10:54 PM

I have the format for the Instrument Index, thanks for the information though. Please let me know if the I/O type is correct for the MOV and VFD? Thanks

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Guru

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#3
In reply to #2

Re: I/O type for Instrument Index

07/20/2017 12:11 AM

I don't know I can't see them from here....

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Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

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#4
In reply to #2

Re: I/O type for Instrument Index

07/20/2017 1:18 AM

Your discrete I/O designations appear to be correct so far. The VFD should be programmable to give a 4-20 mA (or corresponding voltage of 1-5 Vdc) signal to the main control system, where it would be designated as AI (analog input).

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Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#5

Re: I/O type for Instrument Index

07/20/2017 4:18 AM

A1) Looks good from here though the drawings and standards cannot be seen.

A2) as above.

A3) As the drawings cannot be seen, no-one in the forum would be able to give a definitive answer other than the original poster and others at that location.

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Participant

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#6
In reply to #5

Re: I/O type for Instrument Index

07/20/2017 7:13 AM

These are the typicals for MOV and VFD. Will the I/O type below gives all the information to the control system vendor or do I add anything more?

Tag Number

Loop

Instrument Type

I/O type

System

MOV-001M-001Motor Operated Valve--
HS-001M-001MOV Local/Off/RemoteDISIS
ZA-001M-001MOV Battery low alarmDIPCS
ZSC-001M-001MOV Limit switch closeDISIS
ZSO-001M-001MOV Limit switch openDISIS
HSX-001M-001MOV Local Handswitch--

Tag Number

Loop

Instrument Type

I/O type

HS-001V-001HOA SwitchDI
XC-001V-001Pump StartDO
XS-001V-001Pump Run StatusDI
XY-001V-001PermissiveDI
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Guru
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#7
In reply to #6

Re: I/O type for Instrument Index

07/20/2017 7:54 AM

See #5⇑ and read the applicable Client standards for the project as there may well be more to be gleaned from within; those standards cannot be seen from here.

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Power-User

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#11
In reply to #6

Re: I/O type for Instrument Index

07/21/2017 9:12 AM

What you have for MOV is good, unless you have over-torque alarms in the actuator, helps end user troubleshoot, as Carl E suggests.

As Tornado mentions, at the bare minimum, you need pump speed setpoint, analog output AO from your control system usually, or a network message. For an ac drive, the maintenance people and engineers like to see pump load, preferably kW or torque, analog input AI to your control system, or a network message. Speed feedback is unnecessary for a centrifugal pump, it will be so close to the commanded frequency you won't know the difference.

Nice to have on the VFD, common in control system integration and usually available is Drive Health, a DI to your control system, letting operations know it is ready to run. This is a catch-all alarm signal that lets you know if the drive stopped, it was due to a drive problem of some sort.

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Power-User

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#8

Re: I/O Type for Instrument Index

07/20/2017 8:17 AM

You need to look at the actuator's wiring diagram to see what signals are actually available for I/O.

There are dozens, if not hundreds of electric actuator manufacturers out there, so it's not possible to make blanket statements about every available actuator, but in my experience

- Limit switches are used internally to stop the motor at its limit and have no set of external contacts. There is no electrical access for the internal limit switches. Optional Auxiliary switches are used to provide contact closure I/O for purposes of providing status signals of the motors position. If there are no optional switches, then's there's no I/O to connect to.

- A Local/Off/Remote switch that is part of the actuator would typically be used internally by the actuator. Again, contacts are not usually provided to be used as I/O status. An external local/off/remote switch could be configured with auxiliary contacts so that the motor's control status (Local/off/remote) would be available for I/O purposes. Some high end actuators use optional auxiliary relays/switches whose function can be assigned to indicate status via I/O.

- the item labeled 'local hand switch' could be an internal manual switch used to drive the actuator in either direction. Again, is it internal to the actuator or external switch?

Just because a symbol gets sketched on paper doesn't mean it exists in the real world.

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Guru
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#9
In reply to #8

Re: I/O Type for Instrument Index

07/20/2017 8:39 AM

Quite.

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Power-User

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#10

Re: I/O Type for Instrument Index

07/20/2017 9:52 AM

Little of this makes sense.

An MOV is a Motor Operated Valve.

A valve with an Motorized actuator would be used to control flow as an alternative to a pump driven by a VFD and frequently, a loop controller.

A term like 'limit switch' is consistent with an MOV, but not for a pump driven by a rotating motor.

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