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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+.

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+.

Applies To

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