Siemens SINUMERIK 840D sl Function Manual page 228

Connecting sensors and actuators
8.4 Safety-related CPU-CPU communication (F_DP communication)
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 parameterizing data set x set should be assigned to the 2nd SPL connection.
$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]. The alarm response can be
dynamically changed by programming the system variable in the user programming.
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machine data is no longer active until the control re-boots.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_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 one of the plant/system components, can be specified. The following error responses
can be set:
● Alarm 27350 and also STOP D/E
● Alarm 27350
● Alarm 27351 (display only, self-clearing)
● No alarm is displayed:
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Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated