Siemens Sinamics S120 Function Manual page 725

The setting of parameter p0729 indicates how a digital output of a Control Unit has been
assigned, i.e. whether the output of an onboard terminal X122 or X132 is assigned directly to
the Control Unit or connected via PROFIBUS to a higher-level control.
● r0729 = 0: The output is assigned to the Control Unit of the drive or terminal output not
● r0729 = 1: Output is assigned to the higher-level control (PROFIBUS connection).
Parameter r0729 is updated if
● the direction of the onboard terminals changes over (p0728), or
● the signal sources for the outputs (p0738 ff) are changed.
Access priorities
● Reparameterization output control --> output drive via parameter p0738 ff
● Reconfiguration input drive --> output control
● Reconfiguration output drive --> output control
Fault reaction to control failure
The onboard I/Os assigned to the control are switched to the safe state in response to a
fault.
This also applies to terminals whose signals are transferred via the bypass channel on the
control. This status is signaled by failure of the DO1 telegram (sign-of-life failure).
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
available.
Assignment to the control means:
– Terminal is parameterized as output x (p0728.x =1) and
– Terminal is connected with p2901 via BICO, i.e. the control uses the output in
conjunction with the DO1 telegram (p0922 = 39x)
– Use of the terminal's output signal for integrated platform via high-speed bypass
channel of the control (standard channel with DO1 telegram is always written in
parallel).
The drive output has higher priority than a standard control output using the DO1
telegram, but direct access by the control to the terminal (bypass) has higher priority than
the drive output.
When the output is reconfigured to the drive, the control needs to cancel a bypass to the
terminals (if one has been set up) before the new configuration can take effect.
The output of the control has higher priority. This is the specified behavior.
The drive is notified of the change so that the affected application can issue an alarm.
The output of the control has higher priority.
This is the specified behavior.
The drive is notified of the change so that the affected application can issue an
alarm/fault message is necessary. Readback of the output information can cause
problems in the drive, i.e. the drive application checks the interconnection condition of
"its" terminals. If the terminal remains assigned to a drive I/O device as required by the
drive function, but is assigned simultaneously a control terminal status, the drive function
cannot be guaranteed to work correctly.
Basic information about the drive system
12.5 Inputs/outputs
723