Name
UPID
Type
Value
/ Bit
Significance Comments
SBT IO Request
1A60h
Bool
-
Request via IO This value represents the IO request for SBT. On X4, the digital inputs can
be configured to “Req SBT”. Make sure maximal one input is configured to
request SBT.
If either SBT IO Request or SBT Request becomes active, the SBT will be
started.
SBT Request
1A61h
Bool
-
Request via Bus This variable can be written from the RT interface to request SBT. A rising
edge starts the SBT sequence.
If either the SBT IO Request or the SBT Request becomes active, the SBT
will be started.
SBT State
1A42h
Enum8
00h
Idle
SBT is in idle state.
01h
Enable Power
Stage
The power stage becomes active and the motor current can be driven.
02h
Set Positive
Current
The current is setting up to the defined brake test force or torque.
The force is defined with UPID 47D6h.
The torque is defined with UPID 47D7h.
03h
Positive Current
Applied
The current has reached the defined test force or torque.
The force is defined with UPID 47D6h.
The torque is defined with UPID 47D7h.
04h
Set Negative
Current
The current is setting up to the defined negative brake test force or torque.
The force is defined with UPID 47D6h.
The torque is defined with UPID 47D7h.
05h
Negative
Current Applied
The negative current has reached the defined test force or torque.
The force is defined with UPID 47D6h.
The torque is defined with UPID 47D7h.
06h
Reset Current
The current will be set to zero.
STO active
S_ZSW1
Bool
-
STO active
In case of PROFIsafe S_ZSW1 bit 0 signalizes if STO is active.
Table 74: SBT/STO Status Signals
7.17.3 Detailed Functional Description
7.17.3.1 Goal and Function of SBT
The safe brake test verifies if the brake is still capable to hold the motor position. Therefore, the motor is controlled to
produce a force or torque (in both directions). The brake must hold the motor in position. If the position deviates too
much an error will be generated and the SBT has failed.
2S Drive Systems / 0185-1174_E_1V1_SM_C1251-2S / NTI AG
0185-1174_E_1V1_SM_C1251-2S / 2021-11-26 16:43 (Rev. 12500)
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