Siemens SINUMERIK 840D sl Function Manual page 67

● Different terminal strips depending on design
● Automatic ANDing of up to 8 digital inputs (p9620[0...]) on the Control Unit with parallel
configuration of power units in chassis format is not possible.
Terminals for STO, SS1 (time-controlled), SBC
The functions are separately selected/deselected for each drive using two terminals.
● 1. Control Unit switch-off signal path
The required input terminal for Safe Torque Off (STO) is selected via the BICO
interconnection (BI: p9620[0]).
Digital input DI 0 ... DI 7 on the Control Unit can be used as a signal source (NCU). NX
modules have DI 0 to DI 3.
● 2. Motor Module switch-off signal path
The input terminal is the "EP" ("Enable Pulses") terminal.
The EP terminal is periodically interrogated with a sampling time, which is rounded off to
an integer multiple of the current controller cycle; however, it is a minimum of 1 ms.
(Example: t
Both terminals must be energized simultaneously within the discrepancy time p9650/p9850,
otherwise a fault will be issued.
Figure 5-2
Grouping drives
To ensure that the function works for more than one drive at the same time, the terminals for
the corresponding drives must be grouped together as follows:
● 1. Control Unit switch-off signal path
By connecting the binector input to the joint input terminal on the drives in one group.
● 2. Motor Module switch-off signal path
By appropriately connecting the "EP" terminal for the individual Motor Modules belonging
to a group.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
5.6 Control via terminals on the Control Unit and the power unit
= 400 µs, t => 3 x t
i EP
Terminals for "Safe Torque Off" - example for Motor Modules Booksize and NCU7x0
Safety Functions integrated in the drive
= 1.2 ms)
i
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