Dossimass E&H

Moustafa Elsherief

Member
Moustafa Elsherief
Join Date
May 2007
Location
giza
Posts
154
Dear all

we have 6 flow meters " Dossimass E&H" with 10 Khz pulse output form.

We are using S7-300

If I use 6 FM module it will be out of budget.

Could any one recommend me any DI module can handle this frequency or any other suggestion????
 
gclshortt said:
Sometimes when the budget is stained we will use independent counters. Most of the off the shelf counters have a 10 KHz input. We then trigger the pulse output after so many counts to go into the standard PLC input.

Example of Counter:
http://www.automationdirect.com/adc/Shopping/Catalog/Relays_-z-_Timers/Timer_Relays_-z-_Counters_-z-_Tachometers/Multi-Function_Digital_Counter_-z-_Timer_-z-_Tachometer

Hope this helps,
Garry
http://www.accautomation.ca
Click to expand...

Thanks for reply, but I need analogue value to complete the process
 
I have never worked with the Dosimass meters but I have worked with the Promass 83F meters a lot. You may be able to program the transmitter for a much lower resolution than 10k but your accuracy will suffer.

The Dosimass is designed for small batching applications like bottle filling. It is a very accurate meter. If you don't use a high speed counter you will hurt the accuracy of the total system so bad that you would be better off with a much lower cost and lower accuracy meter.
 
Since you have 6 meters, why not use a Modbus RS485 network and one CP 340
for the S7-300.
You save High speed DI's and 6 Analog Inputs €€€ plus wiring etc.
The meters have the Modbus RS485 option.
 
Google
frequency to analog converter

It is a standard signal conditioning module, lots of different manufacturers.

There is some loss of resolution in a conversion freq-to-analog and then analog to digital value, but 4-20mA gives you a conventional signal to work with.
 
After search I found high speed DI module 6ES7321-1BH10-0AA0 this module input signal transition could be 25 to 75 microseconds where the flowmeters are 0.1 second.

Is this module will be useful enough????????
 
danw said:
Google
frequency to analog converter

It is a standard signal conditioning module, lots of different manufacturers.

There is some loss of resolution in a conversion freq-to-analog and then analog to digital value, but 4-20mA gives you a conventional signal to work with.
Click to expand...

I will count the number of pulses Where these meters type is not mine.the customer not need to change it.
 
Bullzi said:
I have never worked with the Dosimass meters but I have worked with the Promass 83F meters a lot. You may be able to program the transmitter for a much lower resolution than 10k but your accuracy will suffer.

The Dosimass is designed for small batching applications like bottle filling. It is a very accurate meter. If you don't use a high speed counter you will hurt the accuracy of the total system so bad that you would be better off with a much lower cost and lower accuracy meter.
Click to expand...

Thanks for your reply..Yes u r right it is expensive chemical filking application.

Did you use high sped DI Module 6ES7321-1BH10-0AA0 could be useful for this case????
 
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