I/O Systems - Select I/OAIS885

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.