HEIDENHAIN PROFINET - Manual (Page 45)

PROFINET IO data description
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4.9 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 19 Status word 2 (ZSW2_ENC)
Bit Value Significance Comments
3 1 Fault Present Unacknowledged faults or currently not
acknowledged faults (fault messages) are pre-
sent (in the buffer).The fault reaction is fault-
specific and device-specific. The acknowledging
of a fault may only be successful, if the fault
cause has disappeared or has been removed
before. If the fault has been removed the en-
coder 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 as-
sume control.
0 No Control
requested
Control by automation system is not possible,
only possible at the device or by another inter-
face.
12..15 Encoder
Sign-Of-Life
Table 20 Detailed assignment of status word 2 (ZSW2_ENC)