Yaskawa YASNAC PC NC PLC Programming Manual User Manual

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YASNAC PCNC PLC Programming Manual Chapter 5: Address Numbers And Map

(11) Address of Keep Memory (#8000 to #9999)

For the one-byte keep memory where the data can be retained after power OFF, addresses
#8000 to #9999 are assigned. With the exception that the keep memory can retain the saved
data, it can be used in the same manner as with the registers.

Therefore, the keep memory can be used as the object of register instructions or auxiliary data
of macro instructions.

When writing a sequence program for random type ATC memory, a keep memory must be
used.

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For one-byte (8 bits) keep memory, address number #8000 or above is assigned.

Example:

2900 in the range from #8000 to #9999

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For the keep memory, the address number itself is used as the symbol.

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For the devices that have one-byte or larger information, a four-digit address number is
assigned.

Although the data are basically of one-byte construction, the data can be handled as two-
byte or four-byte data by the setting for the parameter.