Discussions / Questions - Recent Threads

Need to write logic in DeltaV to split a 16-20 characters to a 2 characters each String . Is this possible ??

Senthilkrishnan M — Thu, 11 Jun 2026 05:29:46 GMT

Hi All,

Hope you are doing well..

I have a requirement where I have to split a string value (with 15-20 characters) into 2 ASCII characters each and then convert it into a 16-bit unsinged interger value and send it through Modbus.

Is there any way to do this..

I have already configured logic in DeltaV for converting the 16-bit data from Modbus to 2 characters in DeltaV and concatenating these 2 character strings (From various 16-bit registers) to get the final string value needed. This is done based on the explanation provided by Ralf Baginski in the forum below

[mention:74a5b0ce788746b592f28e22e751a1c3:46448885d0e64133bbfbf0cd7b0fd6f7]

Thanks to Ralf for providing this solution [emoticon:c4563cd7d5574777a71c318021cbbcc8]

Now I need to do the reverse for sending the string value in the form of various 16 bit data from DCS . Need your kind help on this..

Thanks for your time

RE: Need to write logic in DeltaV to split a 16-20 characters to a 2 characters each String . Is this possible ??

Senthilkrishnan M — Tue, 30 Jun 2026 10:04:24 GMT

Hi Ralf

Thanks for the reply..

Unfournatlyrtunately we are using DeltaV Live, and it seems this is not possible in DeltaV Live..
We have informed the customer that we can convert the 16-bit they send to us to ASCII, but the reverse is not possible in DeltaV, and we hope they accept it :)

Regards
Senthilkrishnan

RE: Need to write logic in DeltaV to split a 16-20 characters to a 2 characters each String . Is this possible ??

Ralf Baginski — Mon, 15 Jun 2026 15:58:52 GMT

Hi,
this task is unfortunately not so easy to achieve.
Due to the lack of DeltaV string handling concatenation of a string works, no splitting commands are provided.
What I can provide is a possibility to use DeltaV Operate for this if you still use it.
I don‘t know if this can be done with DeltaV Live.
Create a Task in DeltaV Operate which is fired if your received String change.
Within VBA you have all string manipulating features you need to split the string in letters and write them back to separate parameters.
You can then assign this schedule to as much workstations as you need to have redundant availability.
Regards
Ralf

SX Controller – EDC block CAS_IN_D Difference Between Versions

Prasanth Gopalakrishnan Nair — Sun, 14 Dec 2025 23:59:11 GMT

Hello All,

We have observed a difference in SX Controller behavior between DeltaV versions 14.3.1.7332 and 14.3.1.7412 related to EDC / CAS_IN_D functionality.

With the CAS SP Track device option disabled, EDC1 / CAS_IN_D is not modifiable in DeltaV 14.3.1.7412 during the LO Mode ( Interlock active ). However, in the previous version (14.3.1.7332), CAS_IN_D could be modified under the same conditions.

In our pump logic, the CAS SP Track option is not enabled, and the EM HOLD command is used to drive CAS_IN_D to the passive state during interlock activation. After upgrading to DeltaV 14.3.1.7412, we noticed that when the EDC block enters LO mode, the HOLD logic is unable to write to CAS_IN_D.

Has anyone experienced similar behavior or can share insights on this change?

Thank you,
Prasanth

How to command an EM from button in DeltaV Live

AutoEngineer1 — Tue, 04 Feb 2025 14:30:35 GMT

I'm struggling to create a new button in DV Live which functions to command multiple EMs to Idle. I'm using WriteAsync function as below. The A_COMMAND.CV parameter is a named set value. The Idle command has named set value of 1. The script verifies without errors but when I test it, the command is not written. I'm sure it's something to do with a type/field mismatch but I've tried so many combinations and can't get it to work.

DLSYS.WriteAsync("EM_Name/A_COMMAND.CV",1)

RE: How to command an EM from button in DeltaV Live

AutoEngineer1 — Tue, 04 Feb 2025 16:10:42 GMT

Solved it finally. Writing string to string works so:
DLSYS.WriteAsync("EM_Name/A_COMMAND.CV.STR", 'Idle')
The single rather than double quotation tripped me up.

PLM Watchdog Failures putting Batches into Hold

Douglas Gigliotti — Fri, 08 Mar 2024 19:10:05 GMT

Hi everyone,

Been having this issue for quite some time now where PLM Watchdog Failures are putting our Batches into Hold. They appear to come when Requests are being sent to the Batch Executive, generally for Report parameters. The number of PLM Watchdog Failures has just recently increased significantly, and appears to be coming in sets of 2 for back to back days, in which the next set of 2 will come roughly 2 weeks later. These also appear to come around the same time each day (i.e. between 2am and 3am). Of course, sending Requests to the Batch Executive are a standard part of the system and we have been doing so since the system was built with no issues. The only thing I can think of that has changed recently is that we have Commissioned quite a few new Units with CIOCs on the system, but those Units were Disconnected without first being Decommissioned, leading to an increase in Device Connection Failures that we're reading in Process History View, that all seem to come in a cluster ever 2 minutes or so. I am quite suspicious that the Device Connection Failures could have something to do with increase in PLM Watchdog Failures, but I wanted to get a second opinion before trying to narrow it down. We did end up Decommissioning those CIOCs and Downloading Changed Setup Data to the associated Controllers, but rather than eliminating the Device Connection Failures, it just removed the associated CIOC Tag we had created in the system, and replaced in with a random ID# (i.e. before they were saying "Device Connection Failure - [Unit#]CIOCnn", and following the Decommissioning and Changed Setup Data Download for the CIOC, the message now says "Device Connection Failure - ID = #xxxxxxxx"). Interestingly enough, we were able to eliminate Device Connection Failures for a few of our CIOCs following the same procedure as we did for the others, which were all on the same Controller, but there are still CIOCs on that Controller that are Decommissioned and showing up with Device Connection Failures still. I should also point out that we are using DeltaV v13.3.2 with a combination of SQ and SX Controllers, though the Units that appear to be causing the PLM Watchdog Errors (ones with an active Batch that is sending Requests to the Batch Executive) have had instances from both SQ and SX Controllers. In short, we are basically trying to figure out:

1. Could these Device Connection Failures be a factor in causing the PLM Watchdog Errors? Are there any other factors anyone can think of that we should be considering?

2. If these Device Connection Failures are a significant facor in causing the PLM Watchdog Errors, does anyone know how to eliminate them?

Thanks everyone, this help will be greatly appreciated!

Doug

How to convert an Integer to String in DeltaV

Vikas Patil — Thu, 15 Feb 2024 13:57:23 GMT

Hello Experts,

We have one requirement where the Detector gives output to DeltaV as an Input in an Integer (ASCII Code). Further we need to convert this Integer value to String to read in to the DeltaV.

Also there is a requirement to send the output to Detector from DeltaV in string.

In short:

Detector sends Integer (ASCII Code) to DeltaV as an Input and

From DeltaV need to send a string to detector in Integer data type.

Thanks in Advance!

RE: How to convert an Integer to String in DeltaV

Ralf Baginski — Fri, 16 Feb 2024 07:45:21 GMT

Hi,
I use dynamic references for this purpose.
Create parameters type string and name it like "ASCII_65" with value "A".
Then set the dynamic reference to "ASCII_" + 'INPUT_VALUE.CV"

For the output use the same chematic with parameters like "ASCII_A" with value 65.
Do this for all characters you expect to receive/send.

Combo box scripting in DeltaV Live

tousif — Wed, 29 Mar 2023 11:06:01 GMT

Hello,

I have four drop down menus of combo box where I want the options in the second, third and fourth drop down menu to be hidden or remove depending of which option is selected in the first drop down menu. I already done in DeltaV Operate by vb coding, but I don't have idea to do scripting in Java in DeltaV Live application please give guidance for it.

VCAT Report or export in Excel

Vikas Patil — Mon, 12 Dec 2022 13:52:36 GMT

Hello Experts,

We have a VCAT enabled on my DeltaV System with 14.3 version.

We are looking for VCAT Export of a report which can give us the consolidate list of the changes done in .CSV or other relevant formats.

Any idea or knowledge available please do share.

Thanks in advance.

Syncade WFX 4.12 Release

kimplacek — Mon, 31 Jan 2022 16:29:30 GMT

Emerson is excited to announce the Syncade WFX 4.12 Release.

This release includes, but is not limited to, the following:

Addition of Phase Server functionality for the Syncade WFX engine
Reduced time for order creation
Improved operator screen refresh and responsiveness

Details of functionality and items included can be found in the release notes and the v4 Syncade Software Release Schedule on Guardian.

We are looking forward to our end users implementing this release and further improving your workflow experience with Syncade.

DeltaV Zones

Amar S Borsune — Tue, 26 Oct 2021 22:19:21 GMT

Anybody in this community from Life Sciences industry has implemented DeltaV zones in GMP manufacturing environment? Two DeltaV Systems/zones communicating (reading and writing parameter values) with each other and Syncade?

HTML 5 WEB BROWSER SUPPORT

Shaswat Raj — Wed, 26 May 2021 17:49:57 GMT

I need to incorporate HTML 5 based web page in Delta V graphic builder bit it is giving error when I load the page.

Which module should I use to embed HTML 5 based URL in delta V

DeltaV/Modbus .CSV string Server to Client data upload

John Barnacle — Tue, 05 Jan 2021 18:03:57 GMT

My company has developed a Win-IoT based instrument for use in the bio-process market to measure process output. Each measurement result and supporting information is written to a line in a .csv file. We are working on creating a background app that will upload the latest data segment to a DeltaV network. We are considering using the Modbus protocol via TCP. Our goal is to create the most "universal" data transfer style possible that can transmit a line of up to 82 ASCII characters. As this is our first foray into this market, we have a limited understanding of data types and conversion functions that exist and might be considered "standard". For reference, a new line of data would be available no sooner than 4 minutes after the last line of data.

One option we are looking at would be to convert the ASCII characters to their HEX values, and use the first 41 Input Registers to transmit the HEX encoded ASCII data. Is there a function on the Client side that can be used to convert the HEX values back to ASCII characters for data storage? Is there a better way?

Thank you for your time and consideration.

John Barnacle

RE: DeltaV/Modbus .CSV string Server to Client data upload

Ralf Baginski — Fri, 15 Jan 2021 07:50:36 GMT

Hi John,

here are some details how t configure it on DeltaV.

First you have to set up a dataset with lets say holding register in I/O layer.
Then create a module with an external parameter referencing a register.

Like see here it is register R42595 with an actual value of'52' which is the decimal value of ASCII character.

You need a table with string parameters which have the decimal code in its name and the ASCII character as value.

To get the ASCII Value create a dynamic reference parameter. The reference can be changed on runtime of the module.

In this example, the reference is set to the parameter 'ASCII_TABELLE/ASCII_52' which have the ASCII character of '4'.

To change the reference put the code into a 'CALC' block in the module.

CODE: '^/DYN_ABFL_STRASSE.$REF' := "ASCII_TABELLE/ASCII_" + '^/ABFL_STRASSE.CV';

I hope that helps.

Cheers

RE: DeltaV/Modbus .CSV string Server to Client data upload

John Barnacle — Thu, 14 Jan 2021 16:49:28 GMT

Hello Ralf,
Thank you for your response, it is encouraging to know there may be a relatively easy solution. As we are new to developing for a DeltaV environment, and don't currently have access to a Client network, if you could please provide a little more detail on how that works it would be appreciated.

RE: DeltaV/Modbus .CSV string Server to Client data upload

Ralf Baginski — Thu, 14 Jan 2021 07:30:23 GMT

Hi John,

it is possible to convert Hex values to ASCII values in DeltaV.

I configured this for a data connection with Siemens S7 PLC.

This can be accomplished with dynamic references.

RE: DeltaV/Modbus .CSV string Server to Client data upload

John Barnacle — Mon, 11 Jan 2021 19:13:47 GMT

The intent of the string transmission from our instrument is to export the data, in the form of a line of CSV (comma separated values) ASCII characters, from the most recent instrument measurement for storage at the Client level. The communication to the Modbus Client will be via a TCP connection. As we develop the application that would reside on the instrument to facilitate said transmission, we are looking for the optimal format for the transmission and the typical way to provide "decoding" instructions for the Client side. Any advice would be appreciated.

RE: DeltaV/Modbus .CSV string Server to Client data upload

István Orbán — Mon, 11 Jan 2021 07:07:25 GMT

DeltaV can receive strings through Modbus-TCP, no issue, there is a string data type for modbus signals. However, once it's a string in DeltaV, you are pretty much stuck. DeltaV can only compare 2 strings and concatenate one string with another, there is no way to extract useful data from your string.

Connecting DelatV OPC UA Client to a Python Server

Rich Bair — Fri, 18 Dec 2020 14:44:15 GMT

I've filed a ticket for this as well but thought I'd reach out more broadly. I just received my development ProPlus station and have the basics setup. As a simple test to start to connect lab products to DeltaV, I've created a simple python freeopcua server that I'm trying to connect to DeltaV using the OPC UA Client tool. Now UaExpert is also installed on the ProPlus station and connects to the server just fine but I'm unable to get DeltaV to connect. When I run the Test Endpoint Connection I receive an error and if I add a LDT under the PDT it fails. I am able to connect OPC UA Client to an OPC UA Server.

Thus, I'm thinking there's something DeltaV requires that perhaps I haven't included in my freeopcua python server. Anyone have experience in this area?

Thanks,

-Rich

Making a Lab Product deltaV "Ready"

Rich Bair — Fri, 28 Aug 2020 18:05:57 GMT

My team develops products for the laboratory and we often use custom embedded controllers. I'm looking for resources regarding how I might make our products ready to be integrated into a deltaV environment which some of our customer use.

My thoughts are 1) maybe we just need to expose data via MODBUS well and then our customers can use a PK controller to connect our device or 2) maybe there is an embedded deltaV API were a product can include this API and fully integrate features where by the product communicates directly with deltaV.

I'm looking for contacts that may have experience in this area and any recommendations.

Thanks,

-Rich Bair

RE: Making a Lab Product deltaV "Ready"

Daniel Arvizu — Fri, 28 Aug 2020 18:59:46 GMT

Rich,
I found this blog insightful, regarding your question: www.emersonautomationexperts.com/.../
Anyway, you can always communicate with a PK Controller using Modbus TCP or OPC UA or EtherNet/IP.
Regards,

DeltaV Live layout issue

SHWETA ASUTKAR — Wed, 12 Aug 2020 12:34:18 GMT

Hello ,

I am facing the error in DeltaV Live in layout which is mention below . I have verified the Layout in graphic studio it is working fine. Let me know if any one know about it.

MAS PLC products or solutions for Lifesciences, Cleanroom applications

praveen.jose@emerson.com — Wed, 25 Mar 2020 06:43:00 GMT

Dear All,

Have MAS products been used for Life Sciences or clean room applications and if YES, how do we comply with the 21CFR part 11 applications? Are there specific segments here where General purpose PLC is asked for?

Do we use the MAS IO's along with other EPMI products to form a solution for these industries. Any presentations around it or success stories around it?

I am based out of India, and was interested in knowing what solutions can be built with MAS products for these industries and how 21CFR part 11 is addressed?