ABB AIS885 Ability™ System 800xA® hardware selector

Select I/O is an Ethernet networked, single-channel granular I/O

system for the ABB Ability™ System 800xA automation platform.

Select I/O helps decouple project tasks, minimizes the impact of

late changes, and supports standardization of I/O cabinetry

ensuring automation projects are delivered on time and under

budget. A Signal Conditioning Module (SCM) performs the

necessary signal conditioning and powering of the connected field

device for one I/O channel.

The AIS885 is an Analog Input Signal Conditioning Module (16-bit)

for use in High Integrity applications (certified for SIL3) supporting

2/3/4-wire devices (1.2 amp) and HART communications.

Features and benefits

• Analog input for 2-wire, 3-wire or 4-wire field devices, powered by AIS885

• Signal range: 4...20 mA

• Can be used in hazardous areas

• Certified for Functional safety

• Field power sourced from the power injection

• Short circuit proof, configurable current limit 0.1 to 1.2 A

• Transmitter power current limited to 25 mA (for 2-wire field devices; input current limitation for

SCM pin 2)

• 16 bit A/D converter resolution

• Galvanic isolation

• Protected against wrong wiring (±35 V) between all terminals

• Hardware filter, rise time 1 ms

• Software filter configurable through parameters

• Diagnostics:

– Loop supervision (open circuit and short circuit)

– Internal hardware supervision

– Communication supervision

– Device malfunction low, under range, over range and device malfunction high detection

– Internal power supervision

– Power injection supervision

• LED indicators:

– Status (S)

– Primary (P)

• Single loop granularity - each SCM handles a single channel

• Supports hot swap

• Mechanical locking slider which turns off field device power and/or output before removal

• Field disconnect function which can galvanically separate the field loop wiring from the SCM during

commissioning and maintenance

• All SCMs have electronic current limitation

• Mechanical keying to prevent insertion of wrong module type after commissioning

• 24V DC powered through Modulebus

• Configurable through parameters

• LED indicators on the SCM indicate the operational state of the module.