Siemens SINUMERIK 840D sl Function Manual page 124

Extended functions
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Several Operator Panels on Several NCUs, Distributed Systems (B3)
2.2 Several operator panel fronts and NCUs with control unit management option
Identifier for PCU/HT6 "Control unit switchover exists"
In certain operating states, PCUs/HT6s must be able to detect whether the control unit
switchover function exists. The requesting interface signal in DB19.DBW110 m_to_n_alive is
provided for this purpose. As soon as block FB101 is called in the PLC, it also sends a sign
of life signal, consisting of the cyclic incrementation of m_to_n_alive (ring counter).
Generation after adaptations
When static parameters are changed in FB101,
● DB101 must be deleted,
● regenerated,
● called and
● stored.
Blocks and functions used
Function blocks
Instance data blocks
Functions
DB of interface
Global data block for error messages
Timer auxiliary function
124
FB101, FB102
DB101, DB102
FC103
DB19
DB2, (DB3)
SFC64
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions

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