Siemens Sinumerik 840D sl Function Manual page 190

Sinumerik safety integrated

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Connecting Sensors/Actuators

7.1 Safety- -relevant input/output signals

Figure 7-1 NCK and drive monitoring channel

For the NCK monitoring channel, signals are input/output via the SPL -- possibly

processed by the NCK (see Chapter 7.1.5 "Multiple distribution and multiple inter-

locking") and emulated (mapped) in the NCK--SGE/SGA interface.

The signals from the drive monitoring channel are input/output via the SPL and

sent to the drive via the interface axis/spindle DB.

Internal SGE/SGA (interface to the various axis--specific safety functions) are, e.g.

selecting and deselecting safety functions, changing--over limit values, output of

status signals. They are defined for the particular Safety Integrated functions.

Sensors -- e.g. switches, pushbuttons, protective door contacts, emergency stop

buttons, light curtains, laser scanners -- are connected to the external SGE (inter-

face to the process, i.e. to the machine). Actuators -- e.g. load contactors, valves,

interlocking solenoids -- are connected to the external SGA. The connection is

established through the PROFIsafe I/O, also see Chapter 7.2. Generally, a brake is

directly connected at the Motor Modules via terminals.

The external and internal SGE/SGA are freely interlocked (logically combined) by

the user using the safe programmable logic (SPL), also see Chapter 7.5.

Crosswise data comparison is implemented between the monitoring channels that

operate independently of one another. If there is inequality, then a STOP F is initia-

ted (CDC between the drive and NCK).

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

NCK signal processing

PLC signal processing

NCK monitoring channel

Drive monitoring channel

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