Start-Up
4.3 Starting up the PLC
4-70
SINUMERIK 802S
6FC5 597–2AA00–0BP2 (01.02)
Table 4-10 Special Flag SM Bit Definition
SM Bits
Description
SM 0.0 Flags with defined ONE signal
SM 0.1 Initial position: first PLC cycle ‘1’, following cycles ‘0’
SM 0.2 Buffered data lost – applicable only to the first PLC cycle (‘0’ data o.k., ‘1’ – data
lost)
SM 0.3 POWER ON: first PLC cycle ‘1’, following cycles ‘0’
SM 0.4 60 s cycle (alternating ‘0’ for 30 s, then ‘1’ for 30 s)
SM 0.5 1 s cycle (alternating ‘0’ for 0.5 s, then ‘1’ for 0.5 s)
SM 0.6 PLC cycle (alternating, one “0” cycle, then one “1” cycle)
4.3.6 Instruction set
A detailed description of the instructions is to be found in the help system of the PLC 802 Pro-
gramming Tool (Help > Contents and Index, “SIMATIC LAD Instructions”) and in the Docu-
mentation “S7–200 Automation System, CPU22x System Manual.
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