1.2.5.4.2 Truth table for digital inputs
STO-SBC In 1 STO-SBC In 2 Internal fault Safety Statusword Error
entry
0 0 no 1
0 1 no 1 “SfeDilvd”
1 0 no 1 “SfeDilvd”
1 1 no 0
0 0 yes 1 “SfeFault”
1.2.5.4.3 Diagnostic functions
1.2.5.4.3.1 Software diagnostics
The safety circuit has two integrated diagnostic functions:
Comparing safety digital input statuses. The fault is activated after 100ms discrepancy of the STO-SBC
inputs. In case a fault is detected, the servo drive will stop the motor and indicate a fault “SfeDilvd” in the
Error Report object.
During the activation of the STO-SBC function the servo drive verifies that the two channels of the module
are internally operating correctly. In case an internal fault is detected, the servo drive will stop the motor
and indicate a fault “SfeFault” in the Error Report object.
1.2.5.4.4 STO-SBC status register
The Safety Statusword indicates the current state of safety functions and Safety Digital Input Diagnostics shows
the state of the safety inputs.
Index Name Descriptions
0x6621 Safety Statusword Subindex:
1 - Bit 1: STO status is the first bit of byte
2 - Bit 2: SBC status is the first bit of byte
STO/SBC status:
0: is not active
1: is active
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