Mitsubishi R28TB Robot Teaching Pendant
The Mitsubishi R28TB is a handheld teaching pendant (teach box) designed for programming and operating Mitsubishi MELFA industrial robot controllers. It provides a comprehensive interface for creating, editing, and debugging robot programs using the MELFA-BASIC IV programming language. The pendant includes a backlit LCD display, function keys, a 3-position deadman switch for operator safety, and jog feed controls for precise robot positioning. It is compatible with CR1, CR2, CR3, CR4, CR7, CR8, and CR9 series robot controllers.
Technical Specifications
Product Type: Teaching pendant / teach box (T/B)
Order Type: R28TB (standard cable length), R28TB-15 (15m cable)
Compatible Controllers: CR1, CR2, CR3, CR4, CR7, CR8, CR9 series
Programming Language: MELFA-BASIC IV
Display: Backlit LCD
Safety Features: 3-position deadman switch (enable switch)
Control Functions: Program creation, editing, position teaching, jog feed, parameter configuration, real-time monitoring
Motion Control: Joint jog, linear jog, and circular interpolation
External I/O Control: Through teaching pendant interface
Dimensions (R28TB-15): 95 mm (W) × 236 mm (H) × 34 mm (D)
Cable Length: 15 meters (special specification)
Safety Certification: CE, UL (as part of robot controller system)
MELFA-BASIC IV Programming Environment
The R28TB uses MELFA-BASIC IV, a high-level programming language designed specifically for industrial robotics. The language supports joint interpolation, linear interpolation, and circular interpolation movements, as well as pallet operations, program flow control, and external signal I/O. Programmers can create complex motion sequences, set speed and acceleration parameters, and implement conditional logic directly from the pendant. The teaching pendant also supports multitasking capabilities, allowing multiple programs to run concurrently on the robot controller.
Safety and Operator Protection
The pendant is equipped with a 3-position deadman switch (enable switch) that must be held in the middle position to enable servo power and allow robot motion. If the switch is fully pressed or released, the servo power is immediately cut off, stopping the robot. This safety feature is essential during teaching operations where the operator is in close proximity to the robot. The pendant also includes an emergency stop button that connects directly to the robot controller's safety circuit, providing an additional layer of operator protection.
Application Domains
The R28TB is used in robot system programming for welding applications (arc and spot welding), painting and coating robots, material handling and palletizing, assembly operations, and research and development environments. It is also used for system diagnostics and troubleshooting during robot maintenance.
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