Siemens Sinumerik 840D sl Function Manual page 254

Connecting Sensors/Actuators
7.4 Safety- -related CPU- -CPU communication (F_DP communication)
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_FSDP_ERR_REAC[1...n]
Output data
-- $A_FSDP_ERROR[1...n]
-- $A_FSDP_SUBS_ON[1...n]
-- $A_FSDP_DIAG[1...n]
The connection number is set using MD $MN_SAFE_SDP_CONNECTION_NR.
Example
The parameterization data set x should be assigned to the2nd SPL connection.
S $MN_SAFE_SDP_CONNECTION_NR[x] = 2
This means, that as user interface, SPL connection x uses the above mentioned
system variables with index 2, e.g.: $A_FSDP_ERROR[2]
MD13338 $MN_SAFE_SDP_ERR_REAC
Error response
The default value for the system variable $A_FSDP_ERR_REAC[1...n] (alarm
response) is entered using machine data $MN_SAFE_SDP_ERR_REAC[1...n]. By
programming the system variable in the user program , then the alarm response
can be dynamically changed.
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in the machine data is no longer active until the control re--boots.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 forthe
system variable $A_FSDP_ERR_REAC[1...n].
Input data, F_SENDDP
System variable: Error response, $A_FSDP_ERR_REAC
The response when a communication error occurs is set using the system variable
$A_FSDP_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 off one of the plant/system components can be spe-
cifically entered. 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.
7-254
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
© Siemens AG 2015 All Rights Reserved
10/15