11.03 3 Safety-Related Functions
3.3 Safe standstill (SH)
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3-85
3.3 Safe standstill (SH)
The "safe standstill" function is based on the pulse cancellation function
integrated in the drive modules of the SIMODRIVE 611A/D (start inhibit).
References: /PJ1/, Planning Guide SIMODRIVE 611
A second pulse shutdown path has been added to the existing pulse
cancellation function on the SIMODRIVE 611 digital Performance and
Standard 2 closed-loop control.
The safe standstill function safely disconnects the energy feed to the motor in
the event of a fault or in connection with a machine function.
A safe standstill is executed in two channels, i.e. by de-energizing an internal
relay via a signal path of the drive bus on the one hand and by de-energizing
terminal 663 on the drive module on the other. The two-channel checkback
signal is also realized on one hand via the drive bus and on the other hand via
the drive terminals AS1/AS2. From NCU software release 06.03.30, the pulse
enable can also be read-back internally for all control modules. This means that
it is not necessary to read back signals from terminal AS1/AS2.
!
Caution
The machine manufacturer must take all of the appropriate measures to
prevent any motion after the energy feed to the motor has been disconnected
(e.g. to prevent suspended/vertical axes from dropping).
The main features of the safe standstill function are as follows:
• The motor cannot be started unintentionally or by accident
• The energy feed to the motor is safely disconnected
• The motor is not electrically isolated from the drive module
The safe standstill function requires the following SW and HW
(refer to Chapter 2.9, "System prerequisites"):
• 611 digital Performance control module
• 611 digital Standard 2 control module
• High Standard
• High Performance
• Software version with SI
The "safe standstill" function corresponds to an external STOP A. This makes it
possible to explicitly select SH not only via internal events (STOP A with limit
value violation etc.), but also via SGE.
• Safe standstill is activated after STOP A.
• Safe standstill is automatically activated from each monitoring channel (via
single channel) when testing the shutdown paths.
Description
Function features
Prerequisites
Selecting/
de-selecting SH
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