This bit can be used to provide machine warm-up time before starting an operation.Ĭlock_60s : SM0.4 This bit provides a clock pulse that is OFF for 30 seconds and ON for 30 seconds, for a cycle time of 1-minute. RUN_Power_Up : SM0.3 This bit is turned ON for one scan cycle when RUN mode is entered from a power-up condition. This bit can be used as either an error memory bit or as a mechanism to invoke a special startup sequence. Retentive_Lost : SM0.2 This bit is turned ON for one scan cycle if retentive data was lost. One use is to call an initialization subroutine.
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Your program can read the status of these bits and then make decisions based on a bit’s value.įirst_Scan_On : SM0.1 This bit is ON for the first scan cycle only. Special Memory Byte 0 (SM0.0 – SM0.7) provides eight bits that are updated by the S7-200 CPU at the end of each scan cycle.
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Communication Processor ex CP 342-5 DP for Profibus.Function modules (FM) ex Positioning modules, Closed Loop.Earlier Siemens use to supply COROS LS/B Components of Siemens S7 300 Series PLC system ?.
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