AO 8-channel 4-20 mA HART card specifications

Installation notes

The 8-channel terminal block is recommended to provide terminations for field wiring for the simplex AO 8-channel 4-20 mA HART card. Optional terminal blocks are the Fused 8-channel terminal block (2-wire) and the 16-pin mass terminal block.
The Redundant Analog Output terminal block is recommended to provide terminations for field wiring for the redundant AO 8-channel 4-20 mA HART card.
The open HART protocol layers digital information on the standard analog 4-20 mA process signal.
This card requires an S-series controller.

Table: AO 8-channel 4-20 mA HART card specifications
Item	Specification
Number of channels	Eight
Nominal signal range (span)	4 to 20 mA
Full signal range	1 mA to 23 mA
Accuracy over temperature range	0.25% (0 to 60°C) 0.4% (-40 to 70°C)
Resolution	14 bits for AO, 8-channel, 4-20 mA, HART
Calibration	Information stored on card
LocalBus current (12 VDC nominal), per card	Simplex: 120 mA typical 150 mA maximum For each redundant card: ⁽¹⁾ 175 mA typical 250 mA maximum
Field circuit power, per card	300 mA maximum at 24 VDC (±10%)
Isolation	Each channel is optically isolated from the system and factory tested to 1500 VDC.
Output compliance	20 mA at 21.6 VDC supply into 700 Ω load
Optional fuse (Simplex mode only)	2.0 A
Communications Support (only for version with HART)	HART pass-through request/response HART variable report Field device status report
Heat dissipation	7.3 W simplex 6.9 W redundant
HART scan time	600-800 ms (typical) per enabled channel
Mounting	Assigned slot of I/O carrier

⁽¹⁾ Double for a redundant pair.

Figure: Simplex AO 8-channel 4-20 mA HART card wiring diagram

Figure: Redundant AO 8-channel 4-20 mA HART card wiring diagram