plc_电池故障Battery_fault23330722_Battery_fault

Application on Control Technology Programming example in Ladder Logic Using SFC51 and the System Status List (SSL) to determine a battery fault Warranty, liability and support Using SFC51 and the System Status List V1.0 2006/05/08 2/6 C op yr ig ht © S ie m en s A G 2 00 6 A ll rig ht s re se rv ed 23 33 07 22 _S FC 51 a nd S S L to d et er m in e a Ba tte ry F au lt. do c Note The application examples are not binding and do not claim to be complete regarding the circuits shown, equipping and any eventuality. The application examples do not represent customer-specific solutions. They are only intended to provide support for typical applications. You are responsible in ensuring that the described products are correctly used. These application examples do not relieve you of the responsibility in safely and professionally using, installing, operating and servicing equipment. 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For questions about this document please use the following e-mail address: mailto:csweb@ad.siemens.de Warranty, liability and support Using SFC51 and the System Status List V1.0 2006/05/08 3/6 C op yr ig ht © S ie m en s A G 2 00 6 A ll rig ht s re se rv ed 23 33 07 22 _S FC 51 a nd S S L to d et er m in e a Ba tte ry F au lt. do c Table of Content Table of Content ........................................................................................................... 3 Using SFC51 and the System Status List (SSL) ........................................................ 4 1 Check_BAF (FC250): checking the status for a battery fault ..................... 4 2 Calling FC250 (Check_BAF) from your program ......................................... 6 3 Reference information.................................................................................... 6 Reference to Automation and Drives Service & Support This entry is from the internet application portal of Automation and Drives Service & Support. The documentation has the entry ID 23330722. Click the link below to directly display the download page of this document. http://support.automation.siemens.com/WW/view/en/23330722 All entries referenced in this document are designated by their entry ID and addressed via the above path. Using SFC51 and the System Status List (SSL) Check_BAF (FC250): checking the status for a battery fault Using SFC51 and the System Status List V1.0 2006/05/08 4/6 C op yr ig ht © S ie m en s A G 2 00 6 A ll rig ht s re se rv ed 23 33 07 22 _S FC 51 a nd S S L to d et er m in e a Ba tte ry F au lt. do c Using SFC51 and the System Status List (SSL) to determine a battery fault In the event of a battery failure, the PLC calls OB81. You can use OB81 to set or reset signals, depending on whether the failure is incoming or outgoing. This user-defined signal can then be used to generate a fault message. In some applications, the fault reset command writes zeros over all fault messages, and any fault that is still active will obviously not be overwritten and will remain on after a fault reset. Because OB81 is called only once, it would not reactivate the alarm for a battery fault, even if the battery fault is still active. The solution to this problem was to generate a static signal that is based upon the System Status List (SSL or SZL) available in the PLC. The sample program Battery_Fault shows how to generate a static signal for a battery fault. 1 Check_BAF (FC250): checking the status for a battery fault The Check_BAF function (FC250) has a single-output BAF that is a BOOL to represent a battery fault. BAF = 0 represents that no battery fault exists, and BAF = 1 represents that a battery fault exists. The function uses SFC51 ("RDSYSST”) to read from the SSL for the battery with an SZL_ID of W#16#392 and an INDEX of W#16#0. Using SFC51 and the System Status List (SSL) Check_BAF (FC250): checking the status for a battery fault Using SFC51 and the System Status List V1.0 2006/05/08 5/6 C op yr ig ht © S ie m en s A G 2 00 6 A ll rig ht s re se rv ed 23 33 07 22 _S FC 51 a nd S S L to d et er m in e a Ba tte ry F au lt. do c Using SFC51 and the System Status List (SSL) Calling FC250 (Check_BAF) from your program Using SFC51 and the System Status List V1.0 2006/05/08 6/6 C op yr ig ht © S ie m en s A G 2 00 6 A ll rig ht s re se rv ed 23 33 07 22 _S FC 51 a nd S S L to d et er m in e a Ba tte ry F au lt. do c 2 Calling FC250 (Check_BAF) from your program Call he Check_BAF function from OB1 (or from an FC or FB). You can also define PDiag Monitoring on the BAF output signal for use as an alarm message. 3 Reference information For information about RDSYSST and the System Status List (SSL), refer to the STEP 7 online help or to the STEP 7 - System and Standard Functions for S7-300 and S7-400 User Manual. For information about the SSL entries for specific S7 CPUs, refer to the following manuals: • S7-300 Programmable Controller Hardware and Installation • S7-400, M7-400 Programmable Controllers Module Specifications Table of Content 1 Check_BAF (FC250): checking the status for a battery fault 2 Calling FC250 (Check_BAF) from your program 3 Reference information