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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.
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#Step 7 siemens timers pulse software#
The SCADA software used by Siemens is Win CC.For S7 300 and 400 system : Simantic S7 manager.Siemens has broadly 3 PLC ranges ie Siemens S7 200, 300 and 400 What are the software used with Siemens ? Programmable Logic Controller – Siemens What are the various PLC system in SIMATIC S7 range ?