Appendix H Optional Functions
H.1 Clearing D Registers at Startup
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Appendix H Optional Functions
H.1 Clearing D Registers at Startup
( 1 ) Overview of Functions
D registers are internal registers that are unique for each user program. Normally, the D register data that is stored in
flash memory is restored for a flash startup, but it is also possible to start with the data cleared. Specifically, The data
cleared by this function is the D registers of DWG (drawings), user functions, and motion programs. Make the settings
in the System Setting of the Environment Setting Dialog Box. With the default settings, the D registers will not be
cleared at startup.
( 2 ) Supported Versions
The following versions support function to clear D registers at startup.
• Controller: Version 2.32 or later
• MPE720: Version 5.21 or later
• MPE720 Version 6: All versions
( 3 ) Setting Procedure for Clearing D Registers at Startup
Use the following procedure to make the setting.
1. Connect the MPE720 online.
Select File (F) - Environment Setting - Setup.
2. Select Enable under the D Register Clear when Start.
3. Save data to flash memory before turning OFF the power supply.
The system will start with the D registers cleared to zeroes the next time that the flash memory starts.
( 4 ) Application Precautions
• Due to the nature of this function, it will only be enabled when starting with flash memory after having set this
function to “enabled” and saving to flash memory.
• It is not possible to clear the D registers for only a specific user program.
• No check is performed to see if the CPU Module supports the function to clear D registers at startup when the
MPE720 is offline. Therefore, confirm that the CPU Module that is being used supports the function to clear D
registers at startup before using this function.
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