Use Of Bidirectional Inputs/Outputs On The Cu - Siemens SINAMICS S120 Function Manual

13.6.2

Use of bidirectional inputs/outputs on the CU

The bidirectional inputs/outputs of terminals X122 and X132 on the CU (DO1) can be used
by a drive object as well as a higher-level controller (resource sharing).
The assignment to a terminal is defined by means of BICO interconnections which are either
connected to a controller via the DO1 telegram p0922 = 39x or to a drive object.
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 controller.
● r0729 = 0: The output is assigned to the Control Unit of the drive or terminal output not
available.
● r0729 = 1: Output is assigned to the higher-level controller (PROFIBUS connection).
Assignment to the controller 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
– Use of the terminal's output signal for integrated platform via high-speed bypass
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 controller --> output drive via parameter p0738 ff
The drive output has higher priority than a standard controller output using the DO1
telegram, but direct access by the controller to the terminal (bypass) has higher priority
than the drive output.
When the output is reconfigured to the drive, the controller needs to cancel a bypass to
the terminals (if one has been set up) before the new configuration can take effect.
● Reconfiguration input drive --> output controller
The output of the controller has higher priority. This is the specified behavior.
The drive is notified of the change so that the affected application can issue an alarm.
● Reconfiguration output drive --> output controller
The output of the controller 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 controller terminal status, the drive
function cannot be guaranteed to work correctly.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
conjunction with the DO1 telegram (p0922 = 39x)
channel of the controller (standard channel with DO1 telegram is always written in
parallel).
Basic information about the drive system
13.6 Inputs/outputs
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