Details On Buffer Memory Addresses - Mitsubishi Electric MELSEC iQ-R-R00CPU User Manual

Details on buffer memory addresses

The following table lists items in the list.
Item
Address
Name
Data stored
Details
Set by (setting timing)
Do not change the data set by the system in a program or by a device test. Doing so may cause an
unintended operation.
APPX
894
Appendix 8 Buffer Memory
Description
Buffer memory address of the CPU module
Buffer memory name of the CPU module
Data stored in the CPU module buffer memory and its meaning
Detailed description of the data stored
Set side of data (system or user) and timing when data is set by the system
<Set by>
• S: System
• U: User (program, engineering tool, GOT, or other testing operations from external device)
• U/S: User and system
<Set timing>
• Every END: Data is set every time END processing is performed.
• Initial: Data is set when initial processing is performed (e.g. powering on the system, changing the operating status from
STOP to RUN).
• Status change: Data is set when the status is changed.
• Error: Data is set when an error occurs.
• Instruction execution: Data is set when an instruction is executed.
• Request: Data is set when requested by a user (using the special relay).
• Switch change: Data is set when the switch of the CPU module is changed.
• Card insertion/removal: Data is set when an SD memory card is inserted or removed.
• Writing: Data is set when a user performs a writing operation.
• During END: Data is set when END processing is performed.