S7-200 Quick Reference Information; Special Memory Bits - Siemens SIMATIC S7-200 System Manual
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S7-200 Quick Reference Information
This appendix contains information about the following:
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
SM0.0
Always On
SM0.1
First Scan
SM0.2
Retentive data lost
SM0.3
Power up
SM0.4
30 s off / 30 s on
SM0.5
0.5 s off / 0.5 s on
SM0.6
Off 1 scan / on 1 scan
SM0.7
Switch in RUN position
S7-200 Programmable Controller System Manual
A5E00066097-02
Special Memory Bits
SM1.0
SM1.1
SM1.2
SM1.3
SM1.4
SM1.5
SM1.6
SM1.7
Result of operation = 0
Overflow or illegal value
Negative result
Division by 0
Table full
Table empty
BCD to binary conversion error
ASCII to hex conversion error
G
G-1
- Quick Links:
- Installing an S7-200 Micro Plc
- Configuration
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settings get erased
Settings on the Siemens SIMATIC S7-200 may get erased if the memory areas are not configured to be retentive. Only the first 14 bytes of M memory (MB0 to MB13) can be configured as retentive, which means they are saved to EEPROM when the CPU loses power. If memory is not set as retentive, its contents are lost during a power cycle. Also, changes made in RUN mode may not take effect permanently until a power cycle or STOP-to-RUN transition occurs.
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