Siemens SIMATIC S5-95F Manual page 371

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S5-95F
Coordination of Frame Sequence (115F-14 and 115F-15 Modes)
The S5-95F resets bit 0 or 2 of the UVB after sending the frame, even if the receiver's operating
system has not accepted the data of the old frame.
Safety Note
When you use message modes 115F-14 and 115F-15, the S5-95F useful frame
monitoring feature is deactivated. To prevent an undetected frame loss, you must not
alter the send mailbox more than once during each safety time for Receive.
EWA 4NEB 812 6210-02
S5-95F on SINEC L1
13-17

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