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Guide Quick Ref | S7-200 Quick Reference Information To help you find information more easily this section summarizes the following information Special Memory Bits Descriptions of Interrupt Events Summary of S7-200 CPU Memory Ranges and Features High-Speed Counters HSC0 HSC1 HSC2 HSC3 HSC4 HSC5 S7-200 Instructions Table G-1 Special Memory Bits Special Memory Bits SM0.0 Always On SM1.0 Result of operation 0 SM0.1 First Scan SM1.1 Overflow or illegal value SM0.2 Retentive data lost SM1.2 Negative result SM0.3 Power up SM1.3 Division by 0 SM0.4 30 s off 30 s on SM1.4 Table full SM0.5 0.5 s off 0.5 s on SM1.5 Table empty SM0.6 Off 1 scan on 1 scan SM1.6 BCD to binary conversion error SM0.7 Switch in RUN position SM1.7 ASCII to hex conversion error DuyMinh Software www.minh.webhop.net 431 S7-200 Programmable Controller System Manual Table G-2 Interrupt Events in Priority Order Event Number Interrupt Description Priority Group Priority in Group 8 Port 0 Receive character Communications highest 0 9 Port 0 Transmit complete 0 23 Port 0 Receive message complete 0 24 Port 1 Receive message complete 1 25 Port 1 Receive character 1 26 Port 1 Transmit complete 1 19 PTO 0 complete interrupt Discrete middle 0 20 PTO 1 complete interrupt 1 0 I0.0 Rising edge 2 2 I0.1 Rising edge 3 4 I0.2 Rising edge 4 6 I0.3 Rising edge 5 1 I0.0 Falling edge 6 3 I0.1 Falling edge 7 5 I0.2 Falling edge 8 7 I0.3 Falling edge 9 12 HSC0 CV PV current value preset value 10 27 HSC0 direction changed 11 28 HSC0 external reset 12 13 HSC1 CV PV current value preset value 13 14 HSC1 direction input changed 14 15 HSC1 external reset 15 16 HSC2 CV PV 16 17 HSC2 direction changed 17 18 HSC2 external reset 18 32 HSC3 CV PV current value preset value 19 29 HSC4 CV PV current value preset value 20 30 HSC4 direction changed 21 31 HSC4 external reset 22 33 HSC5 CV PV current value preset value 23 10 Timed interrupt 0 Timed lowest 0 11 Timed interrupt 1 1 21 Timer T32 CT PT interrupt 2 22 Timer T96 CT PT interrupt 3 DuyMinh Software
