Comparison between Yokogawa Emerson DCS

Answer 1

I've spent a few years involved in the specification and requisitioning of a large (10 000+ I/O) Honeywell DCS, and before that I spent 2 years doing the same for a large yokogawa DCS.

When it came to both the hardware performance/capability and the quality of engineering, there is no comparison, Yokogawa won by a long way. I can't comment on price.

A few gripes I've had with Honeywell:

1) Inter-plant signals - signals had to be hardwired between controllers if they are to be passed from one community/domain to another to maintain a scan rate of 1 second. Sort of takes word 'distributed' out of DCS.

2) Graphics are very limited in the number of tags/variables and many of them had to be split up - much to the operators dismay.

3) Sheer volume of unnecessary documentation - for example, they submitted a 50 page document for review describing the typical software for a differential pressure indication.

The industry has changed a lot of the past few years especially with increased pressure for good resources so I'm sure all DCS vendors are subjected to the same engineering quality problems. Therefore will not go into the engineering issues we had.

Hope that helps.

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I am not fully agree with the above explaination. You may be a Yokogawa supporter, but don't just give false information to other.

1) Inter plant connectivity can be achieved through DSA (Distributed Server Architecture) configuration.

2) Graphics are built for man-machine interface only. Off course, if you want the whole plant to be in one graphic page then that's create performance issue. If you built and arrange your graphic pages properly, there should not be any issue raised.

3) Nobody will agree that 50pages are submitted for a pressure loop description. I have seen SDM (Software Design Manual) from Honeywell used for a particular project. It was nice and explanatory.

regrds

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The one u said on the new Honeywell DCS ... EPKS ....

I am using Honeywell for a long time.... but as a customer we are looking at the work quality

and products ..... I am not sure about Yokogawa but I believe it does have similar problem like Honeywell...

Products problem:

1. Too many bugs

2. No experties in Malaysia for new products

3. SUpport team lack of compentency

4. Product reliability and availability weak...

and all of this contribute more cost to customer where they had to pay them just to fixing things that they also not really expert...

this the reason why user keep asking and concern on the cost for them to repair.

anyway .. both system has their own weakness... so the only ways is how we ensure they

deliver the good quality one..

Answer 2

advantage of centum cs3000 over DeltaV

1) I/O modules are separately attached, hence first impression is decency of hardware. It is easier to do connections & to understand it after wards.

But in deltaV the hardware is very compact & cause difficulty in connection

2) More workstation can be connected in centum

3) More I/O capability

4) Security in software is more

advantage of deltaV over centum3000

1) it is more user friendly wrt to its software

2) For any fault we can see the concerned I/O through software(operating station) only in case of deltaV but not in centum3000

3) easy to design program in FBD.