CC-Link IE Field Network – Digital I/O Configuration Guide

Digital I/O setup on the CC-Link IE Field Network allows seamless control of on/off signals in industrial systems, making it possible to monitor and command discrete devices like switches, lights, and relays. Digital I/O modules provide straightforward control and feedback, essential for industrial automation setups where binary signals dictate operational states. This guide covers the setup process for configuring CC-Link IE Field Network for Digital I/O, detailing system setup, device mapping, and verification for Mitsubishi PLC systems.

1. Introduction to CC-Link IE Field Network

The CC-Link IE Field Network facilitates high-speed communication for digital I/O, linking sensors, actuators, and controllers to a Mitsubishi PLC. Digital I/O provides binary signals that represent operational states, enhancing control over connected equipment.

Key Components:

• Digital I/O Modules: Manage on/off signals for controlling equipment and receiving state feedback.
• CC-Link IE Network Module: Connects the PLC to the CC-Link IE network, ensuring smooth data exchange between the PLC and digital I/O modules.
• PLC: Processes digital signals and executes control commands based on program logic.
• Switches, Relays, and Indicators: Devices that provide or receive digital signals in the system.

2. Configuring Network Topology

Establish an efficient network topology for your system, choosing a setup that aligns with operational needs and physical layout. The network can use line, star, or ring topologies, each suited to different operational requirements.

Common Topologies:

• Line Topology: Useful for straightforward layouts where devices are connected in sequence.
• Star Topology: Connects devices centrally, minimizing communication delays.
• Ring Topology: Provides redundancy, which helps maintain connectivity if a connection is interrupted.

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3. Setting Up the Network Module for Digital I/O

To allow data transfer between the PLC and digital I/O devices, configure the CC-Link IE Network Module.

Network Module Configuration Steps:

1. Install the Network Module: Attach the CC-Link IE network module to the PLC, and connect it with Ethernet cables.
2. IP Address Assignment: Assign a unique IP address to each digital I/O module within the network configuration.
3. Configure Communication Settings: Adjust settings like baud rate and data refresh interval, as needed, to support high-speed, reliable communication.

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4. Adding and Configuring Digital I/O Modules

Digital I/O modules need to be defined within the network configuration, allowing the PLC to recognize each device’s function and location.

Steps for Configuring Modules:

1. Open Configuration Tool: In GX Works3 or your preferred setup software, access the CC-Link IE Field Network configuration settings.
2. Add Digital I/O Modules: Choose the model of each digital I/O module and add it to the network. Assign a unique station number to each module.
3. Define Device Addresses: Set the device addresses for each input and output point, linking each module to a corresponding PLC address.
4. Signal Type Settings: Set whether each point should be an input or output based on the application (e.g., input for sensors, output for indicators).

Configuring Input and Output Points:

• Input Points: Represent signals received by the PLC (e.g., on/off states from sensors or switches).
• Output Points: Represent signals sent from the PLC to control devices (e.g., to activate relays or alarms).

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5. Mapping Digital I/O in the PLC

For the PLC to interpret digital inputs and control digital outputs, map each digital I/O point to the appropriate device addresses.

Mapping Procedure:

1. Access the I/O Mapping Tool: In GX Works3, go to the I/O mapping section, where digital I/O modules are assigned to PLC memory.
2. Assign Descriptive Labels: Label each input/output with identifiers like “Limit Switch” or “Warning Light” to simplify program readability.
3. Configure Data Points: Link each device address to a PLC variable, allowing program logic to read or control the device directly.

Example Mapping:

• Input Mapping: Assign “X0” to a start button or proximity sensor to detect if a machine is ready.
• Output Mapping: Assign “Y0” to control an indicator light or relay for machine start-up.

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6. Testing Digital I/O Communication

After setup, test the system to verify that all inputs and outputs respond as expected and that data flows smoothly between devices and the PLC.

Testing Process:

1. Enable Communication: Activate the network communication in the configuration software to initiate data exchange between the PLC and I/O devices.
2. Check Input Readings: Test each input by toggling the connected devices (e.g., pressing a button) and confirming the PLC detects changes.
3. Test Output Commands: Send commands from the PLC to trigger outputs (e.g., activating a relay) and confirm correct device response.
4. LED Indicators: Monitor module LEDs to ensure normal operation. Status LEDs typically indicate communication health and device activity.

Diagnostic Simulation:

• Simulate operational conditions and observe responses to ensure accurate and dependable device behavior.

7. Troubleshooting Common Issues

Common issues may involve configuration errors, address conflicts, or connectivity problems.

Troubleshooting Tips:

• Address Conflicts: Ensure each module and device has a unique station number and address to prevent signal conflicts.
• Cable Connections: Check all Ethernet and power connections for secure fitting and test for any physical connectivity issues.
• Module Status LEDs: Inspect module indicators for error signals that may point to configuration mismatches or communication issues.
• Diagnostic Software: Use the diagnostics tools in GX Works3 to check device statuses, data flow, and system integrity.

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Conclusion