With the BaseUnits (BUs), the ET 200SP offers a rugged and service-friendly design with permanent wiring:

• No tools needed for one-handed wiring using push-in terminals
• Actuation of the spring NC contacts with a standard screwdriver, with a blade width up to 3.5 mm
• Outstanding access due to arrangement of measuring tap, spring NC contacts and cable entry in columns, while at the same time reducing the space required by 64%
• Fault-proof color coding of the spring NC contacts for better orientation in the terminal panel
• Replacement of I/O modules during operation without affecting the wiring
• Operation with module gaps (gaps without I/O module)
• Automatic coding of the I/O modules prevents destruction of the electronics if a module is accidentally inserted in the wrong slot during replacement
• High EMC interference immunity:
  • self-assembling shielded backplane bus
  • multi-layer conductor plate with shield levels for interference-free signal transmission from the terminal to the I/O module
  • system-integrated, space-saving shield connection for quick installation
• Self-assembling potential groups without external wiring or jumpers
• Replaceable terminal box
• Side-by-side latching of the BUs for high mechanical and EMC loads
• Optional module-specific color identification of the terminals according to the color code CC
• Optional equipment marking using slide-in equipment labeling plates

An ET 200SP station can be expanded via one ‘BU-Send’ BaseUnit with a “BA-Send” BusAdapter plugged onto it with up to 16 modules from the ET 200AL series of I/O devices with IP67 protection.

Siemens BaseUnit ET 200SP Product Specifications: