Siemens Sinumerik 840D sl Function Manual page 253

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Notes and commissioning
When commissioning F_DP communication for the first time, it is recommended
that the monitoring time is initially kept at the default value in order to avoid alarms
caused by the monitoring time being exceeded.
After the F_DP communication has been successfully commissioned, the monitor-
ing time can then be changed to the required value, e.g. monitoring time ² 5 *
F_DP clock cycle of the slower component of the SPL connection with F_DP clock
cycle = $MA_SAFE_SRDP_IPO_TIME_RATIO * IPO clock cycle.
For more complex PLC user programs, it is possible that the parameterized F DP
clock cycle is either briefly or even permanently exceeded. This is the reason that
for diagnostic purposes, the maximum value of the F_DP clock cycle since the last
time the control booted (powered--up) is displayed in machine data
$MA_INFO_SAFE_SRDP_CYCLE_TIME and in the diagnostics screen "SI com-
munication".
Note
It can only be ensured that the level of an output signal is correctly detected on the
sender side and transferred to the receiver if it is present for at least the
monitoring time that has been parameterized (MN_SAFE_SDP_TIMEOUT).
MD13330 $MN_SAFE_SDP_ENABLE_MASK
Enable screen form
The individual parameterizing data sets are enabled using the enable screen form.
The enable mask is bit--orientated, i.e. bit 0activates the 1st parameterizing data
set with machine data index 0.
If a parameterizing data set is not activated, then the machine data of the corre-
sponding SPL connection are not evaluated.
MD13333 $MN_SAFE_SDP_CONNECTION_NR
Connection number
A parameterizing data set is assigned to an SPL connection using the connection
number. Presently, a max. of max. 16 SPL connections can be parameterized for
F_SENDDP. As a result, the value range for the connection number obtained is: 1,
2, 3 ... 16.
In the default setting, a parameterizing data set is not assigned to any SPL con-
nection (connection number = 0). Each active parameterizing data set must be
assigned to an SPL connection. In the case of an error, Alarm 27034 "Parameteri-
zation of MD %1[%2] invalid" is displayed.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
7.4 Safety- -related CPU- -CPU communication (F_DP communication)
Connecting Sensors/Actuators
7-253