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 AIS815 is an Analog Input Signal Conditioning Module (16-bit) supporting 2/3/4-wire devices (1.2 A) and HART communication.

• Analog input for 2-wire, 3-wire or 4-wire field devices, powered by AIS815
• Signal range: 0…20 mA, 4…20 mA
• Can be used in hazardous areas
• 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
• 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.