6 TROUBLESHOOTING

6.2 Using the LED Indications to Check Errors

MELSEC-A

This section explains how to check errors using the LED indications of the AJ65SBT- 64AD.

Refer to the PLC CPU and master module user's manual for issues regarding the PLC CPU and master module.

(1) When the AJ65SBT-64AD "PW" LED is off

Check item

Corrective action

Is 24VDC power on?

Check the external power supply.

Is the voltage of the 24VDC power supply within the

Set the voltage value to within the range 20.4 to

specified value?

26.4V.

(2) When the AJ65SBT-64AD "RUN" LED is flashing

Check item

Corrective action

 

1. Using the remote input signals (RXn4 to RXn7),

Is the LED flickering at 0.1s intervals in the normal

check the channel at which the input range

setting error has occurred.

mode?

2. Make correction to the sequence program or

 

 

GPPW setting.

Is the LED flickering at 0.1s intervals in the test

Set all channels to any of "user range settings 1 to

mode?

3" in input range setting.

Is the LED flickering at 0.5s intervals in the test

Change the offset/gain adjustment to within the

 

mode?

available setting range.

 

(3) When the AJ65SBT-64AD "RUN" LED is off

Check item

Corrective action

 

Using the link special registers (SW0084 to

 

SW0087) of the master module, check the

 

watchdog timer error and power on the AJ65SBT-

Has the watchdog timer error occurred?

64AD again.

 

If the "RUN" LED is not lit after power is switched

 

on again, the possible cause is a hardware fault.

 

Contact your nearest Mitsubishi representative.

Has the TEST terminals (across 8-9) been shorted

After making offset/gain adjustment, open the TEST

to enter the test mode?

terminals (across 8-9).

(4)When the AJ65SBT-64AD "L RUN" LED is off Communications are broken.

For details, refer to troubleshooting in the user's manual of the master module used.

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Mitsubishi Electronics AJ65SBT-64AD user manual Using the LED Indications to Check Errors, Specified value? 26.4V

AJ65SBT-64AD specifications

The Mitsubishi Electronics AJ65SBT-64AD is a high-performance programmable controller designed to meet the demanding requirements of modern automation systems. This module is part of the Mitsubishi FX series of programmable logic controllers (PLCs), known for their reliability, flexibility, and advanced features.

One of the standout features of the AJ65SBT-64AD is its ability to handle 64 analog input channels, making it ideal for applications that require precise monitoring of multiple signals. The module provides a seamless interface for connecting various sensors and transducers, enabling accurate data acquisition in real time. This capability is crucial for industrial environments where monitoring temperature, pressure, flow, and various other parameters is essential for optimal operation.

The AJ65SBT-64AD incorporates advanced signal processing technologies, ensuring high resolution and fast response times. This is particularly important in dynamic applications where rapid changes in process conditions can occur. Additionally, the module supports a wide range of input signal types, including voltage and current, allowing significant versatility in its use across different industries.

Another critical characteristic of the AJ65SBT-64AD is its integration within the Mitsubishi Electric automation ecosystem. This allows for seamless communication and data exchange with other Mitsubishi devices, enhancing system coherence and simplifying configuration processes. By leveraging the integrated engineering tools provided by Mitsubishi, including GX Works2 and GX Developer, users can efficiently program and monitor their systems, reducing downtime and enhancing productivity.

The module is designed with robust construction to withstand harsh industrial environments. Its durability and resistance to dust, moisture, and electromagnetic interference make it suitable for use in a wide range of applications, from manufacturing to process control.

Moreover, the AJ65SBT-64AD employs advanced diagnostics and fault detection capabilities. This functionality aids in preventive maintenance by providing real-time feedback on system performance and potential issues, ensuring that operations run smoothly with minimal interruptions.

In summary, the Mitsubishi Electronics AJ65SBT-64AD is a versatile and high-performance analog input module that offers numerous features tailored for automation applications. Its 64-channel capability, advanced signal processing, robust construction, and integration with Mitsubishi's ecosystem make it a valuable component for any modern industrial automation setup.