Problem with Pt100 measurement

Hello, ABB.

I'm having trouble with a Pt100 measurement.

I'm using a PM554 PLC with an AX522 I/O module. I wired the Pt100 as shown in the user's manual (- to 2.0, + to 2.1 and return to 1.0). I also configured channels 0 and 1 (as indicated on the manual) to read Pt100 3-WIRE -50.0...400.0°C. I'm taking the reading on the PLC from channel 1.

However, when reading the INT value, I get a very low number (equivalent of -44°C), even though I'm currently at approximately 25°C.

I'm not sure if this is a scaling problem. I've programmed the reading of the INT value to be scaled to a REAL by using a 0 to 27648 scale, according to the manual (see attached image).

What could be causing this? I already changed the Pt100 and have the same problem.

Thanks!

 Capture.PNG


Add New Comment


daguilara9   

asked 21 days ago
Closed



Best Answer

2

Hi,

I could suggest you to look in the help for AX522 -> measuring ranges.

When the channel is configured for Pt100, then the decimal value (INT) for the channel is -500...4000 for normal range.

I'm not using LIN_TRAFO, but I guess in your case IN_MIN=-500 and IN_MAX=4000 will make things happen, in case of correct electrical connection.

3-wire sensors require 2 channels !

kstoilov   

answered 21 days ago


 


By daguilara9 on 5/2/2018 | Like (0) | Report

Thanks! I'll try this.

Is this information on the manual? I couldn't find anything related to this.


By kstoilov on 5/2/2018 | Like (0) | Report

in control builder help -> search -> AX522


Add New Comment


Answers

2

Hi,

I could suggest you to look in the help for AX522 -> measuring ranges.

When the channel is configured for Pt100, then the decimal value (INT) for the channel is -500...4000 for normal range.

I'm not using LIN_TRAFO, but I guess in your case IN_MIN=-500 and IN_MAX=4000 will make things happen, in case of correct electrical connection.

3-wire sensors require 2 channels !

kstoilov   

answered 21 days ago


 


By daguilara9 on 5/2/2018 | Like (0) | Report

Thanks! I'll try this.

Is this information on the manual? I couldn't find anything related to this.


By kstoilov on 5/2/2018 | Like (0) | Report

in control builder help -> search -> AX522


Add New Comment



Get weekly AKS updates


Partner Exclusive Webinars

 

> – Login to the partner portal to register



Points Redemption Program - Redeem your points for ABB training, Bluetooth speakers and mugs. Terms and conditions >


Earn points when you refer a friend
AKS Referral Program is "Live" - Learn more



AKS Experts


avatar
Ask nikismith   

Rank: 257

I have been a part of the Recording & Control Factory team for 17 years in total, having spent a number of years as a repairs technician withi the manufacturing department, but being in my current role for 9 years now.


avatar
Ask Govindaraj   

Rank: 10

Working in ABB India Operation Center. Have Project engineering and commissioning experience in ABB 800xA, Freelance, AC500.


avatar
Ask Harsha.D   

Rank: 7

Tech.Support,software and commisioning engineer with Proficient knowledge in 800xA and its products, RNRP,Networking in general.


avatar
Ask Flavio Mussolin   

Rank: 4

ABB AVP, Senior Electronic and Automation Engineer with over 30 years of experience in the field of process automation automotive, pharmaceutical, hollow glass, steel and rolling.


avatar
Ask Ronny Lindström   

Rank: 17

ABB Service Engineer


avatar
Ask Stefan Stromqvist   

Rank: 1

I joined ABB in the year of 1994 and has since 1999 been working as a Service & Support Engineer at BU Control Technologies in Västerås, Sweden. My areas of expertise are: 800xA Base, 800xA for Advant Master, Information Management, operating systems, RNRP and Ethernet comms/networking in general.


avatar
Ask Dieter Henkel   

Rank: 19


avatar
Ask Sumit Gargav   

Rank: 3

I have worked with Freelance in majority, with 800xA FD and Melody system partly. Also had opportunity to work with Protocols - HART,Profibus,FF & Modbus.


avatar
Ask WvanWees   

Rank: 6

I'm a senior service engineer working for ABB in The Netherlands.


avatar
Ask MMM   

Rank: 5

ABB PA CT Technical Support


avatar
Ask Rob Lyon   

Rank: 2

info@lymac.co.nz I'm an independent DCS software and commissioning engineer with extensive experience in 800xA and other ABB products. I've worked in almost every corner of the world and still haven't seen it all.


avatar
Ask kstoilov   

Rank: 9

Control System Engineer: 800xA, Compact 800, AC500, AC31-50, Advant Master, Simatic, AC&DC Drives 11 years worked for ABB - Control Systems