Siemens Sinumerik 840D sl Function Manual page 265

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Example:
The 3rd SPL connection should be used.
S $MN_SAFE_RDP_CONNECTION_NR[x] = 3
MD13348 $MN_SAFE_RDP_ERR_REAC
Error response
Machine data $MN_SAFE_RDP_ERR_REAC[1...n] is used to set the default alarm
response, which is initiated when an F_DP communication error occurs. The alarm
response can be dynamically changed by the appropriate user programming via
system variable $A_FRDP_ERR_REAC[1...n].
After programming the error response using the system variable, the value saved
in the machine data is no longer active until the control re--boots.
The significance of the values for the machine data correspond to the values for
the system variable $A_FRDP_ERR_REAC[1...n].
MD13349 $MN_SAFE_RDP_SUBS
Substitute values
MD $MN_SAFE_RDP_SUBS[1...n] is used to set the default substitute values that
are active after the control boots, which are output from an F_RECVDP driver to
the SPL during an F_DP communication error.
In the SPL program, the user can dynamically enter other substitute values by
writing to the system variable $A_FRDP_SUBS[1...n]. The substitute values set in
the machine data are only active again when the control reboots the next time.
Input data F_RECVDP
System variable: Error response, $A_FRDP_ERR_REAC
The response when a communication error occurs is set using the system variable
$A_FRDP_ERR_REAC[1...n]. This means, depending on the actual coupling or as
a function of the plant/system components involved in the SPL connection, the
response to a communication error, caused by an error in the communication path
or by consciously switching one of the plant/system components, can be specified.
The following error responses can be set:
S Alarm 27350 and also STOP D/E
S Alarm 27350
S Alarm 27351 (display only, self--clearing)
S No alarm is displayed.
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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
7-265