ABB AC500 V3 Hardware Manual page 504

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Device specifications

I/O modules > Analog I/O modules

Fig. 52: 4 analog inputs and 4 analog outputs, individually configurable

"Functionality" on page 501

Connection of resistance thermometers in 2-wire configuration

When resistance thermometers (Pt100, Pt1000, Ni1000) are used, a constant current must flow

through them to build the necessary voltage drop for the evaluation. For this, the I/O module

provides a constant current source which is multiplexed over the 8 analog channels.

Fig. 53: Connection example

By installing equipotential bonding conductors between the different parts of the

system, it must be ensured that the potential difference between ZP and AGND

never can exceed 1 V.

The process supply voltage must be included in the grounding concept (e. g.

grounding of the negative pole).

3ADR010278, 3, en_US

Ä Chapter 1.6.2.2.5.2

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