PLCs are fast, but communication latency exists (Ethernet/IP or Profinet cycles take 1-10ms). By offloading high-speed I/O processing to a static task directly on the ABB controller, you can react to a digital input faster than the network cycle allows. This is critical for high-speed press tending or injection molding extraction where milliseconds dictate scrap rates.
You need to monitor a light curtain or a thermal camera while the robot is welding. In a single-task program, you must insert WaitDI at specific lines, which stops motion. With ABB multitasking, a dedicated safety task runs in a loop every 10 milliseconds. If a safety violation occurs, it can trigger an immediate Stop or StopMove command without needing the main program to cycle back to a checkpoint. abb multitasking
Tasks in the ABB environment are categorized by how they behave during system restarts and emergency stops: Normal Task PLCs are fast, but communication latency exists (Ethernet/IP
to handle background operations like I/O monitoring, communication with PLCs, or managing external equipment without interrupting the robot's physical movement. Core Task Types You need to monitor a light curtain or
These run in the background and continue executing even during an E-Stop. They are often used for safety-critical monitoring or background logic that must never stop.
For decades, ABB has equipped its IRC5 and OmniCore robot controllers with a powerful, yet often underutilized, feature: true multitasking. Unlike standard robotic programming, which runs a single linear sequence of instructions, ABB’s multitasking environment allows a single controller to execute several independent RAPID tasks simultaneously.
