Beckhoff EL2904 TwinSAFE Fail-Safe Output Terminal

This error code indicates that a terminal error has triggered a reset of the TwinSAFE Connection. This condition occurs when the 'Error acknowledge active' parameter is set to 'True'. The TwinSAFE communication and associated safety functions will be interrupted and remain in an error state until manually acknowledged, preventing safe operation.

An error has occurred specifically at digital output 1. This can be caused by faulty test pulses (due to external supply or cross-circuit), high capacitive coupling from parallel cables, an actuator current outside the 20 mA to 500 mA range, or a short-circuit/voltage drop at the output. If left unresolved, output 1 may not function safely or correctly, potentially affecting the connected safety function.

A general error has been detected in the terminal's output circuit, not necessarily specific to a single output. This can include faulty test pulses (from external supply or cross-circuit), excessive current draw or open load conditions (current below 20 mA or above 500 mA), or general output voltage issues like short-circuits. This impacts the safe and reliable operation of the terminal's digital outputs.

An error has occurred specifically at digital output 2. This can be caused by faulty test pulses (due to external supply or cross-circuit), high capacitive coupling from parallel cables, an actuator current outside the 20 mA to 500 mA range, or a short-circuit/voltage drop at the output. If left unresolved, output 2 may not function safely or correctly, potentially affecting the connected safety function.

An error has occurred specifically at digital output 3. This can be caused by faulty test pulses (due to external supply or cross-circuit), high capacitive coupling from parallel cables, an actuator current outside the 20 mA to 500 mA range, or a short-circuit/voltage drop at the output. If left unresolved, output 3 may not function safely or correctly, potentially affecting the connected safety function.

An error has occurred specifically at digital output 4. This can be caused by faulty test pulses (due to external supply or cross-circuit), high capacitive coupling from parallel cables, an actuator current outside the 20 mA to 500 mA range, or a short-circuit/voltage drop at the output. If left unresolved, output 4 may not function safely or correctly, potentially affecting the connected safety function.

The voltage supplied to the power contacts of the terminal is below the permissible operating range (24V -15%/+20%). This can be caused by the voltage not being switched on, being switched on after the terminal supply, being generally too low, or by a short-circuit at an output causing a voltage drop. This affects the overall operation of the terminal's outputs and can lead to unreliable behavior or shutdown of safety functions.

The voltage supplied to the power contacts of the terminal is too high. This could be due to a consistent overvoltage on the power contacts or brief external influences such as switching off contactors causing voltage spikes. An overvoltage can damage internal components of the terminal and compromise its safe operation.

The internal temperature of the terminal has fallen below its specified operating range. This cold condition can negatively impact the performance, response time, and reliability of the internal electronics and overall safety functions. Continued operation outside the specified temperature range may lead to malfunction or damage to components.

The internal temperature of the terminal has exceeded its specified operating range, indicating overtemperature for internal microcontrollers (μC1 or μC2). This can lead to reduced performance, component degradation, thermal shutdown, or even complete failure of the terminal, compromising safety. Prompt resolution is required to prevent permanent damage.

A significant temperature difference has been detected between internal components of the terminal, such as between different processor boards or specific microcontrollers. This indicates an imbalance in heat distribution or a localized thermal issue that could affect the stability and longevity of the terminal's electronics. Unresolved, it can lead to unreliable operation or component failure.