Bus Reset - Mitsubishi Electric MELSEC iQ-R Series User Manual

21.1

Bus Reset

This function resets the bus control. Perform this function when applying parameters written in CW Configurator or when an
error occurs (such as when the ERROR LED turns ON).
Execution of reset
The bus can be reset by any of the following methods:
■Switch operation
Hold the BUS RESET/Y STOP/Y OUT switch on the BUS RESET position (for 1.0 second or longer).
■Remote operation
Perform BUS RESET from the "Remote Operation" screen of CW Configurator. (Page 184 REMOTE OPERATION
FUNCTION)
■User program
Use the CCPU_Reset function. (MELSEC iQ-R MELSECWinCPU Module Programming Manual)
When resetting the bus via a remote operation or from a user program, the remote BUS RESET must be
enabled in the "Remote Bus Reset Setting" of CPU parameters. (Page 185 Remote BUS RESET setting)
Operation after execution
When the bus is reset, this product operates as follows:
• The READY LED flashes slowly in green and turns ON after the bus reset is completed.
• The ERROR LED turns OFF. However, the LED will turn ON or flash again after the bus reset if an error is not cleared.
• When the Y output status is Y OUT, the Y STOP LED turns ON during the bus reset. The Y STOP LED turns OFF after the
reset completes.
• After the bus reset is completed, this product operates with parameters which are written just before the reset.
• This product initializes values of its devices and buffer memory.
• The INFORMATION LED retains the status before the bus reset.
Precautions
• Do not reset the bus if this product is set to a CPU (CPU No.2, No.3, or No.4) other than the bus master CPU (CPU No.1)
in a multiple CPU system. Otherwise, an error may occur in another CPU module. To apply parameters, reset the bus
master CPU (CPU No.1).
• Executing a MELSEC data link function during the bus reset may cause an error in the function.
• If a major error such as a hardware failure occurs, the bus reset may not be completed. If such a case occurs, reset the
hardware or turn the power of the whole system OFF and ON.
21 INDIVIDUAL RESET FUNCTION
190
21.1 Bus Reset