Chapter 26 Bus Access Diagnostics Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

26
BUS ACCESS DIAGNOSTICS FUNCTION
This function diagnoses whether there are failures in hardware used for the bus access function of this product.
For details on the bus access function, refer to the following:
Page 110 BUS ACCESS FUNCTION
Perform the bus access diagnostics in the following case:
• Troubleshooting when a failure occurs in the bus access function
It takes approximately five minutes to perform the bus access diagnostics.
Precautions
• Do not turn the power of this product ON and OFF or reset this product during the bus access diagnostics. (Page 57
POWER OFF AND RESET)
Doing so may result in this product not being able to start normally. If this product does not start normally, perform the
parameter/event history initialization function. (Page 217 PARAMETER/EVENT HISTORY INITIALIZATION
FUNCTION)
• An error may occur in another CPU module if the bus access diagnostics is performed in a multiple CPU system. To
perform the bus access diagnostics, configure a system which only includes a power supply module, a base unit, and this
product. Cables and devices do not need to be disconnected from this product.
Performing diagnostics
The following shows the procedure for performing diagnostics.
1.
Turn the power of this product OFF.
2.
Set the BUS RESET/Y STOP/Y OUT switch to the Y STOP position.
3.
Hold the FUNCTION/SHUTDOWN switch on the FUNCTION position to turn the power of this product ON.
This product starts in the maintenance mode.
In the maintenance mode, the READY LED is ON in orange.
• READY LED: ON (orange)
4.
Release the FUNCTION/SHUTDOWN switch and put it back to the center position.
5.
Set the FUNCTION/SHUTDOWN switch to the FUNCTION position to select the bus access diagnostics.
Every time the FUNCTION/SHUTDOWN switch is set to the FUNCTION position, the operation to be performed is changed.
Item
Bus access diagnostics
For the other function which can be selected in the maintenance mode, refer to the following:
Page 26 Operation mode
26 BUS ACCESS DIAGNOSTICS FUNCTION
202
LED status
• READY LED: ON (orange)
• OS LED: ON (green)
• Other LEDs: OFF