preventive maintenance on Qauantum, siemens, Abradley PLC

I

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instrum

Can you please, send me kind of preventive maintenance (check list) we can perform on Modicon Quantum PLC, Siemens Sematic S7 300 -CPU -315-2DP /S7300/OP7MMI, A-B SLC 500, ControlLogix 1756 - A13 B, A-B 1760-L12BWB. How to "save" the program back up, password management, etc.. Thanks.
 
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