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 AOS850 is an Analog Output Signal Conditioning Module (16-bit) for use in Intrinsically safe applications (Zone 0) supporting 2-wire field devices and HART communications.
Features and benefits
- Analog output for 2-wire field devices
- Signal range: 0...20 mA or 4...20 mA
- Can be used in hazardous areas
- 16 bit D/A converter
- Channel to channel galvanic isolation
- Configurable output rise/fall times (down to 1 ms; with HART down to 20 ms)
- Protected against wrong wiring
- Diagnostics:
- Loop supervision (open circuit and short circuit)
- Hardware error supervision
- Communication supervision
- Internal power supervision
- Support of HART field devices (up to HART application layer rev. 7):
- HART Pass-Through
- Cyclic read of up to two HART Device Variables
- HART Device Validation
- OSP (Output Set to Predetermined value)
- 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