Siemens SINUMERIK 808D ADVANCED Series Commissioning Manual page 131

Special bit memory SM bit definition (read-only)
Inputs (I) and outputs (Q)
Form
● Bit: I0.0, I4.6; Q2.1, Q1.7
● Byte: IB4, IB12; QB3, QB7
● Word: IW2, IW4; QW0, QW6
● Double word: ID2, ID8; QD0, QD4
Accumulators (AC)
A maximum of four accumulators are available:
● Arithmetic accumulators: AC0, AC1
● Logical accumulators: AC2, AC3
Commissioning Manual
131
6FC5397-4EP10-0BA8, 07/2018