Interface Specifications > I/O Interface Keying

Intrinsically Safe I/O Interface Keying

The following table lists I.S. I/O card keying and the recommended I.S. terminal blocks.

I/O Card

I/O Card Keying

Recommended I/O Terminal Block

Optional I/O Terminal Block

I.S. AI, 8-Channel, 4-20 mA, HART

A1

I.S. 8-channel terminal block

I.S. loop disconnect 8-channel terminal block

I.S. AO, 8-Channel, 4-20 mA (HART)

A4

I.S. 8-channel terminal block

I.S. loop disconnect 8-channel terminal block

I.S. DO, 4-Channel

B5

I.S. 8-channel terminal block

I.S. loop disconnect 8-channel terminal block

I.S. DI, 16-Channel(1)

B1

I.S. 16-channel terminal block

(1) The I.S. DI, 16-channel card will not communicate with the DeltaV controller unless the I.S. 16-channel terminal block is used.
Figure: I.S. I/O Example Key Setting