Gabriel Franco Posted May 20, 2013 Report Share Posted May 20, 2013 Hello all. I just moved an application from V130-33-TA24 to a V1210 using local I/O and remote via EX-RC1, including IO-AI4-AO2. V130 used one analog input configured as 4-20 mA coming from a weigh scale indicator which has passive analog transmitter. It uses external 12 VDC power supply (Device requires 8-15 VDC as external power supply) different from the 24 VDC used for OPLC. It worked fine for months. Now, using IO-AI4-AO2 for same purpose and wired the same way, analog input raw value doesn´t move beyond 10. Tests already performed: Doubled checked wiring and configuration. Analog input using 4-20 mA simulator (Active): works fine. Current transmitter signal with digital tester: works fine, reading moves up to 12 mA. Current transmitter signal with digital tester in series with analog module: reading stands about 1.2 mA. Using another analog input: Same situation, raw value doesn´t change. The only relevant difference I found between analog module and V130 is impedance for analog inputs. It seems like this particular transmitter is not compatible with IO-AI4-AO2. I have no information about maximum impedance load from transmitter. Using a resistor in parallel with analog input would be useful? Any suggestion would be appreciated. Quote Link to comment Share on other sites More sharing options...
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