Eaton easySafety Manual page 310

Standard function blocks
306
The backwards pulse input coil SR..BP triggers the following
function when it is activated, depending on the mode:
Coil Function
BIT mode: Transfer of the data bit at input coil
SR..BP
SR..BD to the register SR..Q8.
DW mode: Transfer of the value SR..I2 to the
register SR..D8.
The remaining content of the register is then moved
backwards.
The reset coil SR..RE causes the following in both directions:
Coil Function
Reset of the register
SR..RE
Contacts
For the standard circuit diagram the function block in BIT
mode has 8 contacts SR..Q1 to SR..Q8. A closed contact
indicates:
Coil Function
Output of the bit register fields 1 - 8
SR..Q1 -
SR..Q8
Memory requirement
The SR function block requires 96 bytes of memory plus 4
bytes per constant at the function block input.
02/16 MN05013001Z EN