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 DIS890 is a Digital Input Signal Conditioning Module for use in High Integrity (certified for SIL3) and intrinsically safe applications (Zone0) supporting 2-wire NAMUR field devices with Sequence of Events (SOE).
Features and benefits
- Digital input for 2-wire field devices (NAMUR proximity switches and contacts according to EN 60947-5-6)
- Can be used in hazardous areas up to Zone 0
- Field device power output current limited to 30 mA
- Channel to channel galvanic isolation
- Configurable software signal filter 0...100 ms
- Protected against wrong wiring
- Diagnostics:
- Loop supervision (open circuit and short circuit)
- Hardware error supervision
- Communication supervision
- Internal power supervision
- Sequence of Events (SoE)
- DIS890 supports both Normally Open (NO) and Normally Closed (NC) 24 V loops and both will confirm to SIL3
- 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
- Certified for SIL3