11.03
3 Safety-Related Functions
3.4 Safe operating stop (SBH)
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3-89
SGn
V
act
SGn is active
SBH is active
Braking time
Timer running
SGE "SBH desel."
Delay time
speed switchover
v
t
SG_SBH.DS4
a)
a) Initiation of braking
Fig. 3-13
Timing when selecting SBH from SG
The safe operating stop state can be de-selected with SGE "SBH/SG de-
selection" (="1" signal), resulting in general de-activation of SBH and SG. The
SBH function is also de-selected when the SG function is selected via the SGE
"SBH de-selection".
Note
The delay time must be selected as a function of the distance to the
hazardous location. The speeds to be taken into account in this respect are
stipulated in Standard DIN EN999.
If this SGA is set, then safe operating stop (SBH) is active, i.e. the axis is safely
monitored for zero speed. This signal can be used, for example, to implement
protective door interlocks.
NCK SGA "SBH active" is configured using the following machine data:
For 840D
MD 36981: $MA_SAFE_SS_STATUS_OUTPUT
De-selecting SBH
SGA "SBH active"
Configuring
NCK SGAs