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How Does IO Expansion Make Cartesian Robots More Flexible?

2026/09/02 By le zhan

How Does IO Expansion Make Cartesian Robots More Flexible

Topstar Cartesian robots reserve additional I/O capacity beyond the signals used by the standard program. Based on the standard control configuration, users still have room to expand by at least 11 input and 11 output channels. Although the standard program supports 4 vacuum grippers and 4 fixtures, the control architecture can be expanded to support up to 8 vacuum grippers or 8 fixtures, depending on the specific application configuration.

These additional signals enable the Cartesian robot to perform more independent actions within a single production cycle. Manufacturers need not limit the robot to simple part-handling operations; instead, they can program it to perform insert molding, multi-point gripping, punching or shearing, and collaborative operations with external equipment.

Additional I/O expansion lets you add sensing, control, and collaboration with more devices without replacing the entire robot control platform.

Cartesian Robots Go Beyond Basic “Pick-and-Place” Automation with I/O Expansion

Standard injection molding robots typically allocate some I/O resources to basic functions, such as communicating with the injection molding machine, monitoring mold status, and controlling vacuum cups or grippers. If these standard functions occupy all available I/O points, expanding the robot’s capabilities becomes difficult when subsequent production processes require additional sensors, tooling, or peripheral equipment.

Topstar addresses this limitation by reserving additional I/O capacity beyond the signals defined in standard programs. Its controller supports expansion with at least 11 additional input points and 11 additional output points, providing customers the flexibility to add new process functions without immediately replacing the robot controller.

Cartesian Robots Go Beyond Basic “Pick-and-Place” Automation with IO Expansion

Enabling New Process Conditions and Actions with Additional I/O

The purpose of these additional signals is clear:

Input signals enable Cartesian robots to obtain more information from sensors or external devices.

Output signals enable the robot to control more devices or trigger additional actions.

However, if you add an in-mold insert process to the same production cell, the robot may need additional signals to confirm whether the insert is ready and positioned accurately. In this case, the motion sequence might become:

Insert feeder ready → Robot picks up insert → Sensor confirms insert → Robot places insert → Confirm placement → Robot retracts → Mold closes.

In this scenario, the additional input signals give the robot more process feedback. In contrast, the additional output signals let it control the insert feeder, grippers, vacuum circuits, or other equipment involved in the sequence.

From 4 Suction Cups and 4 Grippers to More Complex End-Effectors

One of the most practical applications of I/O flexibility is at the end of a robotic arm.

A basic injection molding part-removal system may require only 1–2 gripping points. However, more complex molds may require simultaneous handling of multiple parts, runners, or inserts.

Topstar’s standard robot programs support control of:

  • 4 suction cups
  • 4 grippers

Depending on the tooling and application design, this configuration can be expanded to:

  • 8 suction cups or 8 grippers

This is not merely an increase in the number of pneumatic components. The true advantage lies in the independent control capabilities of Topstar’s Cartesian robots.

From 4 Suction Cups and 4 Grippers to More Complex End-Effectors

Enabling Multi-Point Independent Gripping with Cartesian Robots

Take a four-cavity injection mold as an example:

If a single vacuum command can remove all molded parts, the tooling structure is relatively simple. However, certain applications require independent operation for each part or gripping point.

For example:

  • Suction cup 1 picks up part A;
  • Suction cup 2 picks up part B;
  • Suction cup 3 picks up part C;
  • Suction cup 4 picks up part D.

When the handling sequence involves different timing or logic, independent control gives the robot greater flexibility. It also supports more complex end-effectors, allowing different parts to perform different tasks. For example, one part may pick up the finished product, while another removes the sprue.

Using I/O Expansion to Enable In-Mold Insert Placement and More Complex Injection Molding Processes

When a Cartesian injection molding robot performs tasks beyond simply retrieving finished products, I/O expansion capabilities become particularly important.

In-mold insert placement is a common application. In the in-mold insert molding process, the robot may need to perform the following steps:

Grip one or more inserts;

Confirm that the inserts have been successfully gripped;

Enter the mold area;

Position the inserts;

Release the inserts;

Confirm successful placement;

Exit the mold area;

Send a signal to allow the injection molding machine to resume operation.

This process involves multiple independent conditional checks.

Using IO Expansion to Enable In-Mold Insert Placement and More Complex Injection Molding Processes

Support for Multiple Inserts or Multiple Placement Points

As the number of inserts increases, this scalability also rises. A mold may need to accommodate multiple metal inserts, nuts, terminals, decorative parts, or other components. Different inserts may require different vacuum suction or gripping commands, and Cartesian robots may also need corresponding verification sensors.

Controllers with limited I/O port resources quickly become system bottlenecks.

By providing ample input/output capacity and scalable suction/gripping control, Topstar enables customers to develop more complex in-mold automation applications using a single Cartesian robot.

Collaborating with External Devices via Flexible I/O Expansion Signals

Expanded I/O capabilities enable Cartesian robots to collaborate directly with external devices, such as insert feeders and conveyor belts. Rather than relying on fixed delay settings, the robot uses real-time signals to confirm whether external devices are ready before entering a workstation. Then it sends status signals—such as “product loaded” or “robot has retreated”—to trigger subsequent actions.

This approach helps the production process remain responsive and reliable even when cycle times fluctuate.

At the same time, I/O-based handshake communication helps prevent motion conflicts between the robot and peripheral equipment. These signals improve process coordination and operational interlocking, although dedicated safety circuits should still be used for safety-critical functions. Thus, I/O expansion enables Cartesian robots to integrate more easily into complex automated injection molding production cells.

Collaborating with External Devices via Flexible IO Expansion Signals

IO Expansion Provides Process-Level Flexibility for Cartesian Robots

The flexibility of a Cartesian robot depends not only on the number of axes but also on the size of its working range. In injection molding automation applications, flexibility also depends on how many devices the robot can sense, control, and coordinate.

The flexibility of IO expansion provides Cartesian robots with greater versatility:

  • In addition to the signals used by standard programs, it provides at least 11 additional input interfaces;
  • It provides at least 11 additional output interfaces for expansion;
  • It supports 4 vacuum grippers and 4 fixtures as standard;
  • Can be expanded to up to 8 vacuum grippers or 8 fixtures based on application requirements;
  • Supports independent multi-point control and customer-defined programming operations.

These features enable Cartesian robots to move beyond simple product removal to more complex tasks, such as in-mold insert placement, multi-point handling, punching operations, and coordinated control with external equipment.

 

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