Safe Operating Stop (Sbh) - Siemens Sinumerik 840D sl Function Manual

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Safe operating stop (SBH)

The function safely monitors the stop position (zero speed) of an axis/spindle in

closed--loop position or speed control.

When SBH is active (SGA "SBH active" = 1), operating personnel can, for

example, enter protected machine areas in the setting--up mode without first

having to power--down the machine.

An incremental encoder is sufficient to implement this function. The actual position

value is monitored for a change.

In this case, the encoder coarse position must be taken into account for a 1--enco-

der system (see Chapter 5.4 "Actual value conditioning").

The features of the SBH function are as follows:

S The axis remains in closed--loop control

S Parameterizable SBH tolerance window

S STOP B is the stop response after SBH has responded

Standstill tolerance

The standstill of the axis/spindle is monitored using an SBH tolerance window that

is parameterized using the following machine data:

for 840D sl:

MD36930 $MA_SAFE_STANDSTILL_TOL

for SINAMICS S120:

p9530 SI Motion standstill tolerance (Control Unit)

The width of the SBH tolerance window should be based on the standstill (zero

speed) monitoring limit and should lie slightly above it. Otherwise, the standard

monitoring functions of the control could be ineffective. In this case, the encoder

coarse position must be taken into account for a 1--encoder system.

SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition

Safety functions integrated in the system/drive

6.2 Safe operating stop (SBH)

Sinamics s120