Technical data

Safety Integrated Functions
8.5 Safety Integrated Extended Functions
Function Manual
Function Manual, 06/2012, 6SL3097-4AB10-0BP4
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8.5.4.1 EPOS and Safe Stop 2
Since the function SS2 – with its setpoint-independent braking – is not suitable for use with
EPOS, the Safe Operating Stop (SOS) function can be used with delay.
On selection of SOS, the EPOS function "intermediate stop" (p2640 = 0) ensures that EPOS
is able to stop the drive in its tracks and then keep it under control in this state before the
SOS becomes active. The maximum necessary braking time (from p2573 and p2645 from
EPOS) must then be entered in the delay time for SLS/SOS (p9551/p9351) with a small
safety addition: This ensures that the drive is stationary before SOS becomes active.
To do this, proceed as follows:
1. Connect the EPOS function "intermediate stop" (p2640) with the SOS selection (r9720.3).
2. Enter the maximum necessary braking time from EPOS (depending on the values set in
p2573 and p2645) with a safety addition (approx. +5%) in the SOS delay time
(p9551/p9351).
Overview of important parameters (see SINAMICS S110 List Manual)
● p2645 CI: EPOS direct setpoint input/MDI, deceleration override
● p2573 EPOS maximum deceleration
● p2594 CI: EPOS maximum speed, externally limited
● p2640 BI: EPOS intermediate stop (0 signal)
● p9351 SI Motion SLS changeover delay time (CPU 2)
● p9551 SI Motion SLS(SG) changeover delay time (CPU 1)
● r9720.0...10 CO/BO: SI Motion drive-integrated control signals
● r9733[0...1] CO: SI Motion setpoint speed limit effective
8.5.5 Safe Operating Stop (SOS)
General description
This function serves for fail-safe monitoring of the standstill position of a drive.
Personnel can enter the protected machine areas without having to shut down the machine
as long as SOS is active.
Drive standstill is monitored by means of an SOS tolerance window (p9330 and p9530). The
function SOS comes into effect in the following cases: