Burkert Type 8642 - Manual (Page 41)

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CHECK_BACK Detailed information of the device, bitwise coded.
More than one message possible at once.
Bit Information
0 in “Fail-save” position
8 Valve opens
9 Valve closes
16 The number of switching cycles pre-defined in
TRAVEL_COUNT_LIM has been exceeded
20 Time for opening exceeded
21 Time for closing exceeded
1 = active
0 = inactive
CHECK_BACK_MASK Definition of supported CHECK_BACK informtion bits
1 = supported
0 = not supported