DI-8B42-01 4-20mA Current Loop Transmitter Workaround

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Symptoms
Cause
Resolution
   Make sure that your connections are correct
   Place a 0.02µF ceramic disc capacitor between In+ and Ex+
Applies To

Symptoms

Readings in WinDaq appear erratic when attempting to acquire data from a 2-wire transmitter using a DI-8B42-01 module.

Cause

Rarely, the DI-8B42-01 module could go into oscillation with certain transducers.

Resolution

To resolve these issues follow the steps below.

Make sure that your connections are correct

The transmitter should be connected across Ex+ and In+.

The transmitter should be connected across Ex+ and In+.

Place a 0.02µF ceramic disc capacitor between In+ and Ex+

If your connections are correct; place a 0.02µF ceramic disc capacitor between In+ and Ex+.

place capacitor as shown

Applies To

DI-718B(x), DI-788 and DI-78B input expanders containing DI-8B42-01 modules.