Siemens Sinumerik 840D sl Function Manual page 216

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Connecting Sensors/Actuators

7.2 Connecting I/O via PROFIsafe

The PROFIsafe address of the F master is provided under:

S HW Config > Properties dialog of the F module> F parameter:

F_source_address

PROFIsafe clock cycle

The PROFIsafe clock cycle defines the time grid in which new F telegrams are

generated by the F master for transfer to the F modules. By default, the PROFI-

safe cycle time is derived from the interpolation cycle with the ratio 1:1.

As part of the PROFIsafe communications, a cyclic interrupt of the PLC user pro-

gram (OB1) is made. This is realized in the PROFIsafe clock cycle via OB40.

In order to reduce the possible resulting computational load, machine data

S MD10098 $MN_PROFISAFE_IPO_TIME_RATIO

(factor, PROFIsafe communications clock cycle)

can be used to modify the ratio between the PROFIsafe and interpolation clock

To achieve a sufficiently fast response time for PROFIsafe communication, the

PROFIsafe cycle time must not be set to longer than 25 ms. The selected PROFI-

safe clock cycle is displayed in the machine data:

S MD10099 $MN_INFO_PROFISAFE_CYCLE_TIME

(PROFIsafe, communications clock cycle)

If the PROFIsafe cycle time is longer than 25 ms, an alarm will be displayed the

next time the control starts up:

S Interrupt: 27200 "PROFIsafe cycle time %1 [ms] is too long"

PROFIsafe clock cycle and DP cycle time

The PROFIsafe cycle time should be parameterized to be longer than the DP cycle

time displayed by STEP 7: HW--Config. Otherwise, the load (in time) on the PLC

user program is increased as a result of unnecessary OB40 interrupts.

The PROFIsafe clock cycle should be parameterized so that the following applies:

12 ms < PROFIsafe clock cycle < 25 ms

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

Sinamics s120