Boot operation from the standard ROM

The boot operation from the standard ROM is not possible.The program memory of universal model QCPU is a flash ROM.Thus, writing in the program memory achiev... More Details >>

Clearing the battery error without resetting the CPU module

It is impossible. Battery replacement is essential in clearing the battery error and the power of the programmable controller must be turned off before the... More Details >>

Remedy for the division-related operation error

The operation error occurs when the divisor is 0.Create a program in which a comparison operation instruction or another method executes a division instructi... More Details >>

Ethernet communication after the replacement of an external device

Personal computers have different MAC addresses and an Ethernet module hold a MAC address. Hence the MAC address that the Ethernet module currently holds is ... More Details >>

Q series device data held in the case of a power failure

The data in the devices assigned to Latch (1) or Latch (2) in the "Device Setting" window ([PLC Parameter] -> [Device Setting] window) is held when a pow... More Details >>

MODBUS(R) interface module's involvement in master and slave stations

Intelligent function module settings allow them to be set in both master and slave stations. More Details >>

Replacing an AnS I/O module with a Q I/O module

Yes. More Details >>

Compatibility between the A series modules and Q series modules

When an ACPU module is replaced with a QCPU module, programs for the ACPU module can be used by changing the PLC type in GX Developer. However, the programs ... More Details >>

Deleting GX Developer when installing GX Works2

GX Developer does not need deleting when GX Works2 is installed. More Details >>

QCPU built-in Ethernet port setting when using the simple PLC communication function

The following settings are required for the "Open Setting" for the number of connected external devices. - Protocol: "UDP" - Open System: "MELSOFT connecti... More Details >>