Siemens Sinumerik 840D sl Function Manual page 264

Connecting Sensors/Actuators
7.4 Safety- -related CPU- -CPU communication (F_DP communication)
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".
MD13340 $MN_SAFE_RDP_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 corresponding SPL connection are not evaluated.
The enable screen form is set using MD13340 $MN_SAFE_RDP_ENA-
BLE_MASK.
MD13343 $MN_SAFE_RDP_CONNECTION_NR
Connection number
A parameterizing data set is assigned to an SPL connection using the connection
number. A max. of 16 SPL connections can be parameterized for F_RECVDP. 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 "Parame-
terization of MD %1[%2] invalid" is displayed.
The connection number is, at the same time, also the index to access system
variables of the user interface of the SPL connection. The user interface involves
the following system variables:
Input data
-- $A_FRDP_SUBS[1...n]
-- $A_FRDP_ERR_REAC[1...n]
Output data
-- $A_FRDP_ERROR[1...n]
-- $A_FRDP_SUBS_ON[1...n]
-- $A_FRDP_ACK_REQ[1...n]
-- $A_FRDP_DIAG[1...n]
-- $A_FRDP_SENDMODE[1...n]
The connection number is set using MD $MN_SAFE_RDP_CONNECTION_NR.
7-264
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
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