AI 8-channel 4-20 mA HART card specifications

Installation notes

The AI 8-channel terminal block (2 or 4-wire) is recommended to provide terminations for field wiring for the AI 8-channel 4-20 mA HART card. Optional terminal blocks are the Fused 8-channel terminal Block (2-wire), the 8-channel terminal block, the 16-pin mass terminal block, and the 24-pin mass terminal block.
The Redundant Analog Input terminal block is recommended to provide screw terminations for field wiring for redundant AI 8-channel 4-20 mA HART cards for either 2-wire or 4-wire applications.
To function correctly, the AI cards require that 24 VDC be supplied through the field power connection which is also used for the card's A/D converter. Power for the 4-wire transmitters must be provided from an appropriate external power source. See the transmitter specifications for power source information.
The open HART protocol layers digital information on the standard analog 4-20 mA process signal.
This card requires an S-series controller.

Table: AI 8-channel 4-20 mA HART card specifications
Item	Specifications
Number of channels	Eight
Nominal signal range (span)	4 to 20 mA
Full signal range	1 to 22.5 mA, with overrange checking
Accuracy over temperature range	0.1% of span
Repeatability	0.05% of span
Resolution	16 bits
Rolloff frequency	-3 dB at 2.7 Hz, -20.5 dB at one-half sampling frequency
Calibration	None required
LocalBus current (12 VDC nominal), per card	Simplex: 32 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%)
Field circuit power per channel	30 mA maximum
Isolation	Each channel is optically isolated from the system and factory tested to 1500 VDC.
Optional fuse (Simplex mode only)	2.0 A
Valid range for LED indication	0.75 to 23 mA
Communications support (only for version with HART)	HART pass-through request/response HART variable report Field device status report
Heat dissipation	5.3 W simplex 5.9 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 AI 8-channel 4-20 mA HART card wiring diagram

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