The G4PB16T is a 16-channel I/O Mounting Rack with terminal strip that accommodates up to 16 G4 I/O modules. The terminal strips let you insert and remove modules easily and quickly without disturbing field wiring. Modules are secured to the mounting rack with a threaded captive hold-down screw. Barrier strips with screw terminals provide the field, logic and mounting rack power connections. Modules on the G4PB16T can be wired for standard negative true logic only.