NIDS01 | ABB Digital Station Interface Module

The mounting termination unit is accommodated in a suitable field housing (junction box) to protect it from environmental exposure. When mounting the unit in a hazardous area you only have to use a field housing with increased safety (EEx-e). Appropriate readymade S900 field housings are available. I/O system S900 is powered/connected via sufficiently protected terminals on the mounting termination unit, with increased safety EEx-e. The power supply units, the communication interfaces, and the I/O modules are plugged into the mounting termination unit and locked automatically. The power supply modules have a built-in shut-off mechanism with automatic locking and can be plugged/ removed under power in zone 1, although the EEx-e supply in the primary circuit is still active in this case. As a result, the I/O system S900 does not require an explosion-proof or pressurized housing and, therefore, is easy to handle.