Principle Of Operation; Parameterization; Interface To The Sinamics S120; Communication Direction F_Brake_Test -> Sinamics S120 - Siemens Simatic Manual

Fail-safe function blocks for storage and retrieval machines
Time monitoring external brake request initi-
10
ated by SBT
11 Reserved
12 Reserved
13 Reserved
Warning: no safety-related position, SBT not
14
possible
Warning: no safety-related velocity, SBT not
15
possible
3.8.2

Principle of operation

3.8.2.1

Parameterization

When parameterizing (assigning parameters) it should be observed that the following rela-
tionships must be able to be represented as integer multiple:
T_OPEN_BR_1 / T_SAMPLE
T_CLOSE_BR_1 / T_SAMPLE
T_OPEN_BR_2 / T_SAMPLE
T_CLOSE_BR_2 / T_SAMPLE
The permissible value ranges of the individual inputs should be taken from the table describing the
inputs.
The block identifies if not all of the mentioned preconditions are satisfied, and this is signaled as
parameterizing error with the appropriately set DIAG bits.
Note
The block only checks the parameterization at the 1st call. This results in a sub-
sequent increased block performance.
As a consequence, reparameterization is not permitted when safety operation is
deactivated. The safety program must be regenerated and loaded each time that
any of the block operating parameters are changed.
3.8.2.2

Interface to the SINAMICS S120

The interface between F_BRAKE_TEST and SINAMICS S120 is subsequently described. The
communication runs in the standard telegram via status/control word S_ZSW3B(Safety Info Chan-
nel status word 3)/S_STW3B (Safety Control Channel control word 3). To do this, SBT selection
should be interconnected to "SBT via SCC (p10235)". Interconnection of the signals to the block
should be taken from the subsequent table.
3.8.2.2.1 Communication direction F_BRAKE_TEST -> SINAMICS S120
Bit Meaning
0 Select brake test
1 Start brake test
2 Brake selection
Select direction of
3
rotation
Select test se-
4
quence
Status of external
5
brake
6...15 Reserved
S7-Distributed Safety/SIMATIC Safety - fail-safe function blocks for storage and retrieval machines
Remarks
1 Brake test selected
0 Brake test deselected
1 Start brake test requested
0 Start brake test not requested
1 Test brake 2 selected
0 Test brake 1 selected
1 Negative direction selected
0 Positive direction selected
1 Test sequence 2 selected
0 Test sequence 1 selected
1 External brake closed
0 External brake open
-- --
positive edge at ACK, restart the test, reset for
a successfully completed test
---
---
---
POS_VALID = 1
V_VALID = 1
Parame-
F_BRAKE_TEST
ters
r10235.0 BUSY
r10235.1 SBT_START
r10235.2 SBT_BR_SELECT
r10235.3 SBT_TORQUE_DIR
r10235.4 SBT_SEQUENCE
r10235.5 SBT_FDBACK_BR
-- --
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