![]() ![]() ![]() You can use this bit to enable Freeport mode only when the switch is in the RUN position. Mode_Switch : SM0.7 This bit indicates the current position of the Mode switch (OFF=TERM position and ON=RUN position). This bit can be used as a scan counter input. It provides an easy-to-use delay or a 1-second clock pulse.Ĭlock_Scan : SM0.6 This bit is a scan cycle clock that is ON for one scan and then OFF for the next scan. It provides an easy-to-use delay or a 1-minute clock pulse.Ĭlock_1s : SM0.5 This bit provides a clock pulse that is OFF for 0.5 seconds and then ON for 0.5 seconds for a cycle time of 1 second. 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. 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. Explain The System Bits Available In S7-200 Plc Special Memory Area ? Interface module – For interconnecting individual racks (IM 360/ 361, IM365 S / R).Communication Processor ex CP 342-5 DP for Profibus.Function modules (FM) ex Positioning modules, Closed Loop.Components Of Siemens S7 300 Series Plc System ? Programmable Logic Controller (PLC) Interview Questions Earlier Siemens use to supply COROS LS/B.The SCADA software used by Siemens is Win CC.For S7 300 and 400 system : Simantic S7 manager.What Are The Software Used With Siemens ? Siemens has broadly 3 PLC ranges ie Siemens S7 200, 300 and 400 What Are The Various Plc System In Simatic S7 Range ? ![]()
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