Functions
8.18 Fail-safe functions
Control Units CU240S
8-100 Operating Instructions, 11/2006, A5E00766042B AA
The Control Unit with fail-safe functions has specific fail-safe functions integrated into its
system. These are:
● Safe Torque Off (STO)
● Safe Stop 1 (SS1)
● Safely-Limited Speed (SLS)
● Safe Brake Control (SBC)
These functions are controlled using either the fail-safe digital inputs on the front of the CU,
PROFIsafe via PROFIBUS-DP interface located at the bottom of the CU. See figure below.
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Figure 8-66 Control Unit with fail-safe functions
Fail-safe functions are only available on the Control Units with fail-safe functions. On the
standard CUs, the fail-safe features are not available.
The parameters for the fail-safe functions are held on two separate processors within the
control unit. Each processor holds a unique copy of the parameterized fail-safe function.
These unique copies of the parameterized fail-safe function are accomplished by double-
parameters. Double-parameters have their own unique number, but have identical
functionality. Each processor controls two separate and isolated shutdown control
mechanisms which are continually monitored by the system to ensure they are operating
correctly. Should a discrepancy occur, then the Latched Safe Torque Off is activated.
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