7.17.3.6 SBT Sequence
The brake test is performed autonomous on the drive. The brake keeps blocking all the time. The motor is powered
producing a force in both directions. During all the time the position of the motor is watched. The test is passed, if the
motor does not move more than SBT Motion Limit (UPID 47D9h) allows.
The following variables display the status of the SBT:
Name
UPID
Type
Value
/ Bit
Significance Comments
Safety Fn State
Word
1A06h
UInt32
Bit 13
Error active
Same as UPID 1A1Dh
Bit 14
Acknowledge is
required
Same as UPID 1A1Eh
Bit 17
Brake Test Time
elapsed
Same as UPID 1A21h
Bit 18
SBT runs
Same as UPID 1A22h
Bit 19
Brake Test
failed
Same as UPID 1A23h
Safety System State 1A01h
Enum8
03h
Operation
The safety module is working normally. In this state, STO or the brake
may be active.
05h
Safe Brake Test A brake test is processing. The test will be triggered by the drive
processor.
Safety Fn State Error 1A1Dh
Bool
-
Error active
This flag is set if an error on the safety module is active.
Cleared if no error is active.
This bit can also be accessed via UPID 1A06h bit 13.
Safety Fn State Int
Event
1A1Eh
Bool
-
Acknowledge is
required
Set if an explicit acknowledge is required as an interface event.
Cleared if no acknowledge is required.
This bit can also be accessed via UPID 1A06h bit 14
Safety Fn State
Brake Tst time Ov
1A21h
Bool
-
Brake Test Time
elapsed
Set if the time, specified in parameter 47DAh “SBT Request Interval” is
elapsed. A brake test must be performed to clear this flag. Then the
interval time restarts counting.
Cleared if the brake test interval, specified in parameter 47DAh has not
elapsed or after the SBT has been performed successfully.
This bit can also be accessed via UPID 1A06h bit 17.
Safety Fn State SBT
runs
1A22h
Bool
-
SBT runs
SBT sequence is running.
This bit can also be accessed via UPID 1A06h bit 18.
Safety Fn State
Brake Tst Failed
1A23h
Bool
-
Brake Test
failed
An error during the brake test has been detected.
Possible causes: brake does not work correctly, motor has moved or no
brake is configured (neither non-safe nor safe brake).
Recommended actions: Check brake, check wiring.
This bit can also be accessed via UPID 1A06h bit 19.
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.
The table is continued on the next page.
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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