Yaskawa YASNAC PC NC PLC Programming Manual - Manual (Page 35)

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YASNAC PCNC PLC Programming Manual Chapter 5: Address Numbers And Map
In the case of two or four-byte data, the address is specified as a one-byte unit address;
the address of the least significant byte is used as the address for two or four-byte data.
(12) Writing the Initial Values for Keep Relays and Keep Memory
When keep relays and keep memory are used in a sequence program, it is necessary to set the
initial values for these devices before running the program.
Set the initial values following the procedure indicated below.
€ In MMI environment, select UTILITIES.
ó From Utilities screen, select LOGIN.
ì To initialize values for Keep Relays and Keep Memory you must log in at
Machinist Level or Higher. Also, at the bottom of the Login screen
“Enable Parameter Change” option must be selected.
ö Now, select the “Maintenance” screen and hit “PLC Diagnostics”
ú In this screen, simply search for the keep relay or keep memory
that you wish to initiate. Once you have found your address, simply click on it
to select it.
÷ Once
you have selected your address bit, click on “SET”.