Issue with WAGO 750-455 Analog Input Modules Configuration

CODESYS
,
1

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Hello,

I have a configuration issue with my WAGO PFC300 PLC and 3 analog input modules. Here’s the problem:

Current Setup:

  • 3 WAGO 750-455 modules (4AI 4-20mA SE)

  • Each module has 4 analog inputs (IW0 to IW13 total)

  • Only 1 input (IW4) is working and fluctuating (values 1100-1200)

  • All other inputs show constant value “3”

Issue Description:

I’m trying to read pressure differential values from 12 PumpMeter sensors (6 pumps × 2 pressure sensors each), but only one input is providing real data while the others display a default value of “3”.

Environment:

  • Codesys V3.5 SP21 Patch1

Any help would be greatly appreciated.

Thank you.

2

Hi,

Value = 3 means current is below 3 mA or wire break.

Is the wiring correct?

What sensors do you have exactly? Are these loop powered sensors or do they source the current?

Variables will only be updated if they are used.

SP21 Patch 1 is for Firmware 29, currently it is only available for the PFC 200s.