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116
10 TROUBLESHOOTING
10.1 Checking Errors with LEDs
10
TROUBLESHOOTING
This chapter explains errors that may occur in a safety extension module and their troubleshooting methods.
To resolve an error immediately, determining the cause and applying appropriate corrective actions are essential.
The troubleshooting methods are as follows.
10.1
Checking Errors with LEDs
Checking the LED status is the primary diagnostics without GX Works3. It narrows down the causes of the error.
The status of a safety extension module can be verified by checking the POWER LED, ERROR LED, and LEDs for each I/O.
The correspondence relation between LEDs and safety extension module statuses is shown below.
LEDs on an FX5-SF-MU4T5
Checking method Description Reference
Checking errors visually (by LEDs) A method for checking the module status by LEDs.
Primary diagnosis can be performed without an engineering tool. Page 116 Checking Errors with LEDs
Checking errors with an engineering
tool Check an error occurred in the module and error history, and identify the
cause using an engineering tool (including GOT).
The detailed information such as error cause and corrective actions obtained
from an engineering tool is more helpful than those obtained by a visual
inspection. Page 119 Checking Errors with an
Engineering Tool
LED name LED color Description
POWER LED Green Indicates the power supply status.
ON: Normal operation
Flashing: The rotary switch setting was changed during operation.
OFF: Powered OFF
ERROR LED
*1
Red Indicates an error status.
ON: An error occurred in any one of the safety extension modules.
Flashing (two times): Failed to apply the settings to the safety extension module.
Flashing (three times): The rotary switch setting was changed during operation.
Flashing (four times): Any of the following errors occurred.
• The input statuses of any of X0, X1, or X2 are incorrect.
• The module was powered ON after the rotary switch setting has been changed in the power OFF state.
• The ENTER button is pressed for three seconds or more.
• A setting was not applied after changing the position of a module.
Flashing (five times): A power supply error occurred.
Flashing (six times): A self-monitoring error or an internal error occurred.
OFF: No error
I0 LED Green Indicates the input status of I0.
ON: Input ON
Flashing: A process error, or synchronization time/concurrence error occurring.
Flashing (I0 and I1 flash in phase): A cross-circuit occurred between I0 and I1.
OFF: Input OFF
I1 LED Green Indicates the input status of I1.
ON: Input ON
Flashing: A process error, or synchronization time/concurrence error occurring.
Flashing (I0 and I1 flash in phase): A cross-circuit occurred between I0 and I1.
OFF: Input OFF
I2 LED Green Indicates the input status of I2.
ON: Input ON
Flashing: A process error, or synchronization time/concurrence error occurring.
Flashing (I2 and I3 flash in phase): A cross-circuit occurred between I2 and I3.
OFF: Input OFF
I3 LED Green Indicates the input status of I3.
ON: Input ON
Flashing: A process error, or synchronization time/concurrence error occurring.
Flashing (I2 and I3 flash in phase): A cross-circuit occurred between I2 and I3.
OFF: Input OFF
Q0/Q1 LED Green Indicates the output statuses of Q0 and Q1.
ON: Output ON
OFF: Output OFF