DO, 8-Channel, 24 VDC, High-Side

The DeltaV system supports the DO, 8-Channel, 24 VDC, High-Side card and the Series 2 DO, 8-Channel, 24 VDC, High-Side card (Simplex and Redundant modes).

Installation Notes

The Fused I/O terminal block is recommended to provide screw terminations for field wiring for the DO, 8-channel, 24 VDC, High-Side and the Series 2 DO, 8-channel, 24 VDC, High-Side card in Simplex mode. Optional terminal blocks are the I/O terminal block, and the 10 and 16-pin mass termination blocks.
If you use a mass termination block with the DO, 8-channel, 24 VDC, High-Side I/O card, refer to the termination block specifications for the output rating for each block. Those specifications might be more restrictive than the specifications listed in Table: DO, 8-Channel, 24 VDC, High-Side Specifications (includes Series 2) .
The Redundant Discrete terminal block is recommended to provide screw terminations for field wiring for the Series 2 DO, 8-channel, 24 VDC, High-Side card.

Line Fault Detection — The Series 2 DO, 8-Channel, 24 VDC High-Side card has line fault detection that can be enabled on a channel-by-channel basis as a configuration item. When line fault detection is enabled, the card detects open and short line fault conditions by performing an internal readback of the output to verify its value in both on and off states. The card tests the opposite state of its current value by temporarily changing the output to that value, performing the internal readback, then returning the output to its configured output value. The pulses to the opposite state are never greater than 200 µSec. High speed inputs that connect to a DO channel with line fault enabled must consider these pulses in the input software scheme. When line fault detection is not enabled, a more limited detection of open and short line fault conditions is available on the active redundant card only. This is accomplished by the internal readback mechanism without pulsing the output to the opposite state. Therefore, shorts can be detected only when the DO channel is on, and opens can be detected only when the DO channel is off. When line fault detection is not enabled, and the card is simplex, line fault tests do not run and line fault conditions are not reported.

Line Fault Detection	Value Detected
Short Circuit	< 5 Ω for > 3 seconds
Open Circuit	>25 KΩ for guaranteed open loop detection < 8 KΩ for guaranteed no open loop detection

When pulse testing is enabled, the LED on the output device may be slightly illuminated.

Note

Line fault detection is not compatible with significant capacitive loading (cable + load > 30 nF) and must be disabled under these conditions.

Specifications

Table: DO, 8-Channel, 24 VDC, High-Side Specifications (includes Series 2)
Item	Specification
Number of channels	Eight
Isolation	Each channel is optically isolated from the system and factory tested to 1500 VDC.
Output range	2 VDC to 60 VDC Series 2: 24 VDC ±10%
Output rating	1.0 A continuous per channel (inrush 4.0 A for <100 ms; 6.0 A for <20 ms); 3.0 A maximum per card
Optional fuse (Simplex mode only)	2.0 A (inrush 5.0 A for <10 ms at 0.1% duty cycle)
Off-state leakage	1.2 mA maximum
LocalBus current (12 VDC nominal), per card	100 mA typical 150 mA maximum Series 2: 90 mA typical 150 mA maximum
Field circuit power, per card	3.0 A at 24 VDC (±10%)
Configurable channel types:
Discrete Output	If FAIL_ACTION_MODE is Hold last value (default): Output stays in last state submitted by the controller. If FAIL_ACTION_MODE is Go to configured failure action mode: Output is driven to the configured faultstate value.
Momentary Output	If FAIL_ACTION_MODE is Hold last value (default): Output finishes current pulse. If FAIL_ACTION_MODE is Go to configured failure action mode: Output is driven to the configured faultstate value and the channel is re-configured as a latched output.
Continuous Pulse Output	If FAIL_ACTION_MODE is Hold last value (default): Output continues pulsing. If FAIL_ACTION_MODE is Go to configured failure action mode: Output is driven to the configured faultstate value and the channel is re-configured as a latched output.
Mounting	Assigned slot of I/O carrier

Wiring Diagrams

Figure: Wiring Diagram for Series 2 DO, 8-Channel, 24 VDC, High-Side in Simplex Mode

Figure: Wiring Diagram for Series 2 DO, 8-Channel, 24 VDC, High-Side in Redundant Mode