Defining the Problem:
A Power Plant has Hydroelectric Generators with 10 ohm copper 3 wire RTDs embedded in the stator motor windings. The RTDs are far away from a PLC in the control room. The long distance is picking up noise that is interfering with their measurements.
System Requirements:
A Siemens PLC can communicate using Profibus DP / RS485. Install Remote Profibus I/O, Class 1 Div 2 approved, close to the RTDs. Shorter RTDs, with proper shields and grounding techniques, will significantly reduce the noise for more accurate measurements.
Featured Product
966PB-2006
Implementing the Solution:
1. Select a Slave Address and configure the 966PB-2006 parameters using a GSD file. Download the file into the PLC.
2. Wire the RTDs, power and Earth Ground.
3. Program the PLC for 50 to 80°C normal RTD temperature ranges.
4. Validate the measurements.
Why Acromag:
The on for interoperability with Profibus equipment ensuring ease of set up and operation. The products are fully isolated and engineered with a Siemens SPC3 intelligent ASIC providing reliable Profibus communications.
This application note was provided by our supplier Acromag.
For further information about the Acromag products used in this application, please do not hesitate to contact us.
Metromatics I 07 3868 4255 I sales@metromatics.com.au
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