DeltaV™ M-series Traditional I/O

interface carrier that can be pre-wired before I/O card 

installation.

A Traditional I/O card easily plugs into an I/O carrier

I/O Cards

A variety of analog and discrete I/O cards are available to 

meet your specific requirements. The following cards 

support simplex or redundant installation:

 AI 4-20 mA HART 8 channels

 AO-4-20 mA HART 8 channels

 DI, 24 VDC Dry Contact, 8-channels

 DO 24 VDC High Side, 8-channels

The following I/O cards are supported in simplex format to 

meet your field wiring needs.

 AI 4-20 mA HART 16 channels

 AI Isolated, 4 channels

 RTD, 8-channels

 Thermocouple, 8- channels

 Millivolt, 8-channels

 DI, High Density, 32-channels

 DI 24 VDC Isolated, 8-channels

 Multi-Function, 4 channels (Isolated DI)

 Sequence of Event, 16 channels (DI 24 VDC)

 DI 120 VAC Low Side Detection, 8-channels

 DI 120 VAC Isolated , 8-channels

 DO, High Density, 32-channels

 DO 24 VDC Isolated, 8-channels

 DO 120/230 VAC High Side, 8 channels

 DO 120/230 Isolated, 8 channels

All I/O cards are enclosed in a common form factor that 

plugs into the I/O interface carrier. The housing is clearly 

labeled with the enclosed I/O card type. All cards have 

power and internal error indicators. Eight channel cards 

have clearly visible channel status LEDs.

All cards meet ISA G3 corrosion specifications by the 

careful selection of superior electronic components and 

the use of conformal coating.

Pulse Counters are available on most DI cards. The 

supported maximum frequency varies from 0.1 Hz on AC 

signals to 75 or 120 Hz on 24 VDC inputs. For higher 

pulse counts up to 50 KHz, use the Multi-Function card’s 

high speed pulse input. 

DeltaV provides control module level time stamping for log 

events and alarms. For greater event resolution the 16 

channel Sequence of Events DI card can provide signal 

driven events to a resolution of +/- 0.25 ms per card, or 

within 1 ms per controller. Please refer to the Sequence 

of Events PDS for more information on Sequence of Event 

data collection and system options for this feature.

I/O Card Redundancy

Redundant I/O cards are available for critical applications. 

The same card can be used in simplex or redundant 

applications. When installed on a two-wide redundant 

terminal block, the cards are recognized as a redundant 

pair by the controller. The controller scans each card and 

determines which card is acting as the active interface. 

When a fault is detected, the system automatically 

switches to the standby I/O card. 

DeltaV Control modules reference simplex and redundant 

I/O channels identically and there is no special 

configuration required to take advantage of redundancy. 

Switchover of a redundant I/O card is completed within 

two scans of the I/O bus. Make-before-break contacts 

ensure digital field instruments remain powered and the 

process is undisturbed. Analog output signals are briefly 

driven by both cards for < 5 ms during switchover of the 

card.

Hardware Alerts automatically report hardware integrity 

errors for both the primary and secondary cards. Any 

event that causes a switchover is also reported 

automatically through the system hardware alerts and is 

logged in the Event Chronicle. 

Events that can cause a switchover include.

 Hardware failure within the active card.

 Communications failure between the active card and 

the controller.

 Detection of a fault in the field wiring

A switchover may also be initiated from the diagnostics 

explorer, and the health and status of both cards and their 

channels are available in the diagnostics explorer.

The system automatically commissions a new standby 

card. In safe areas, failed cards can be replaced under 

power. In hazardous areas, appropriate installation 

procedures must be followed.

 Fused 8-Channel Terminal Block

 AI 8-Channel Terminal Block

 AI 16-channel Terminal Block

 4-wire AI 16-channel Terminal Block

 Discrete 32-Channel Terminal Block 

 Isolated Input Terminal Block

 RTD/Resistance Terminal Block

 Thermocouple Terminal Block

The following redundant I/O terminal blocks are available 

on some I/O interfaces, allowing a pair of cards to be 

installed as a redundant pair.

 Redundant AI 8-Channel Terminal Block 

 Redundant AO 8-Channel Terminal Block

 Redundant Discrete 8-Channel Terminal Block 

The table on the following page lists the compatible 

terminal blocks for each card, along with the cards unique 

key positions. The first terminal block listed is the 

recommended terminal block. 

In addition to standard signal wiring, some cards may also 

be ordered with Mass Termination blocks that allow these 

cards to be connected to M-Series Mass Connection 

Solution or to third party wiring solution, mounted in an 

adjacent cabinet in order to meet special signal 

conditioning or for optimizing field wiring solutions. Please 

refer to the PDS M-series Mass Connection Solution or to