Banner XS/SC26 Security Controller Debugging and Troubleshooting

Common causes and solutions for displaying fault code information

2.1/2.2 Concurrent/Simultaneous Fault: The time difference between the changes in the two signals of the dual channel input exceeds 3 seconds (or the simultaneity requirement is not met). Check if the wiring is loose, adjust the filtering time of the input signal (Debounce), or check the sensor itself.

2.8-2.9 Input stuck high: The input terminal is short circuited to the power supply. Check if the circuit is in contact with+24V or if there is an internal fault in the input device.

3.1-3.2 EDM Fault External device monitoring contacts did not close/open as expected. Check if the contactor is stuck and if the coil is disconnected.

4.1 Supply Voltage Low 24V power supply voltage drops by more than 6 ms. Check the power supply capacity and output load for excessive load.

4.20 Unassigned Terminal in Use detected 24V for terminals that are not mapped in the configuration. Check if the wiring is incorrect or if the running configuration is consistent with the physical wiring.

1.1 Output Fault (Solid state) The safety output still detects voltage when turned off. Usually it is due to excessive voltage drop of the 0V common line (see 3.3).

Recovery steps:

Input latch: After repairing the fault, turn on and off the input device again to clear it.

Output latch (including EDM/AVM faults): After repairing the fault, operate the reset input connected to the output FR node.

System latch (e.g. 4.20): After fixing the cause, perform a system reset - this can be done through the reset input configured as System Reset, or by clicking "System Restart" in the software (when connected via Ethernet), or by powering off and then on again.

Practical case: Silent function and two-level manual reset

6.1 Requirements

A robot welding workstation, with an entrance protected by a light curtain, needs to achieve one-way silence: when the workpiece enters from the conveyor belt, the light curtain automatically silences, and the protection is restored after the workpiece passes through. At the same time, it is required that the operator press the "allow entry" button on the side of the machine before manually resetting the safety circuit.

6.2 Configuration Points

Input device:

Light curtain (PNP, dual channel) → IN1, IN2.

Silent sensor 1 (M1) and silent sensor 2 (M2) → IN9/IN10 and IN11/IN12.

Manual reset button (non safety) → a normal input.

Function block:

Add a Muting block and select 'One Way Muting, 2 Muting Sensor pairs'.

Connect the light curtain to the IN node of the Muting block, and connect M1/M2 to the MP1/MP2 nodes respectively.

Connect the output of the Muting block to the secure output SO1.

Check LR (Latch Reset) and FR (Fault Reset) in the attribute of safe output SO1, and connect the manual reset button to both LR and FR nodes (via a Reset OR block).

Timing verification:

The workpiece triggers M2 → M1 → departure in sequence, the light curtain is muted, and the output remains ON.

If the mute timeout (default 30 seconds) or sensor sequence error occurs, the output will be turned off and manual reset is required.

If the light curtain is blocked during non silent periods, the output will be immediately turned off and manually reset.

6.3 Details that are easily overlooked during debugging

The mute sensor must be dual channel, and both channels must be turned on simultaneously within 3 seconds, otherwise the mute cannot be activated (Manual I.2).

Mute Enable is optional. If enabled, additional input signals are required to allow mute - suitable for situations where workpieces are only allowed to enter during certain stages of the machine cycle.

The mute lamp is a physical state output that can be configured to flash or stay on, indicating the mute activation status. According to the standard, the operator must be able to see the indication from the location of the silent device.