Circuit Manual Group =5 - Siemens SINUMERIK 840D sl Manual

7.7

Circuit Manual Group =5

7.7
Axis-specific drive with safety functions; shutdown with emergency stop (circuit manual
group =4) or with the separate Axis Drive Stop pushbutton. Assignment of the digital inputs
and outputs using the data of the standard macros.
● Supply and control of the Single Motor Module, incl. axis-specific channel formation for
● Connection of the motor and the SMC20 sensor system to the Motor Module
● Control of the motor holding brake using the contactor (=5.-K24), internal brake control of
● Safety control for the axis-specific emergency stop with safety relay (=5.-K21, -K23)
Application
The control is used where one or more drives must be selectively shutdown from a running
axis group in safe engineering. A two-channel keyswitch or, for example, light barriers or limit
switches, can be used to safely remove the drive from the drive group. The drive must have
been previously shutdown safely using the PLC logic. The "Safe Standstill" function is used
to prevent an unwanted restart.
Functions
Start drives
The two-channel stop circuit in front of the safety switching device (=5.-K21) must be closed
using the following conditions:
● Drive Stop keyswitch (=5. –S21) closed.
● Emergency Stop Circuit Protection (=4. -K42) closed.
● The Start (=5. -S22) pushbutton and the closed feedback loop is used to activate the
The state of the safety switching device (=5.-K21) is queried using PLC -E526 (=4./Bl. 4.5).
The drive can now be traversed using the PLC.
Stop drives
The Drives Stop (=5.-S21) keyswitch, or for emergency stop (=4.-K72), is used to shutdown
the safety switching device (=5. -K21). The instantaneous contact uses the PLC input
(=4./Bl. 4.5) and the internal PROFIBUS connection to remove the OFF3 command from the
drives, the drive (=5.-M15) is braked at the torque limit.
The off-delayed contact (=5.-K21) is used to select and activate the "Safe Standstill" function
on the Control Unit (=4. -K11-X122:4, DI3) and the Motor Module (=5.-Q11-X21:3, EP) on
two channels.
"Safe Standstill" function feedback
The "Safe Standstill" function is monitored in the Control Unit and in the Motor Module.
Guide for the SINUMERIK 840D sl machine configuring
Manual, 07/2006 Edition, 6FC5397-6CP10-0BA0
the Safe Standstill (SH) function
the Motor Module is not activated
contactor (=5.-K21) with "monitored start" which then latches.
Typical circuit diagrams
7.7 Circuit Manual Group =5
7-39