HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 46)

PROFIBUS IO data description
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5.8 Status word 2 (ZSW2_ENC)
The status word 2 (ZSW2_ENC) is referred to as the slave’s sign
of life and it includes the fault buffer handling and Control by PLC
mechanism from PROFIdrive ZSW1 and the Slave Sign-Of-Life
mechanism from PROFIdrive ZSW2. This signal is mandatory for
controlling the clock synchronization.
Bit Function
0...2 Reserved
3 Fault present/No fault
4,8 Reserved
9 Control requested
10,11 Reserved
12...15 Encoder sign-of-life
Table 16 ZSW2_ENC definition
Bit Value Significance Comments
3 1 Fault present Unacknowledged faults or currently not
acknowledged faults are present. The
fault reaction is fault-specific and device-
specific. The acknowledging of a fault
may only be successful if the fault case
has disappeared or has been removed
before. If the fault has been removed the
encoder returns to operation. The related
fault numbers are in the fault buffer.
0 No fault
9 1 Control requested The automation system is requested to
assume control.
0 No control requested Control by automation system is not
possible, only possible at the device or
by another interface.
12-15 Encoder sign-of-life
Table 17 Detailed assignment of Status word 2 (ZSW2_ENC)