Siemens Sinumerik 840D sl Function Manual page 267

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A user acknowledgment can be realized as follows:
S PLC: Interface signal DB18.FRDP_ACK_REI
S NCK: Channel_1 reset
Driver- -specific interface signal: DB18.FRDP_ACK_REI
The user acknowledgment is realized with a 0/1 change of the interface signal
level. The interface signal must either be set or reset by the PLC user program.
The applies to all F_RECVDP drivers.
The driver--specific interface signals are single--channel signals and are therefore
not part of the crosswise data comparison SPL--CDC.
Note
The user acknowledgment via the interface signal only refers to acknowledging a
communication error. If an alarm is initiated when a communication error is
detected, this is not acknowledged, and neither the alarm nor the stop responses
are reset.
Channel_1 reset
The user acknowledgment is internally realized in the system by initiating the
channel_1 reset by pressing the reset key on the machine control panel
The interface signal is a single--channel signal and is therefore not part of the
crosswise data comparison SPL--CDC.
Note
If an alarm is initiated when a communication error is detected, the alarm is
acknowledged, and the alarm and stop responses are reset.
Output data F_RECVDP
System variable: Error signal, $A_FRDP_ERROR
System variable $A_FRDP_ERROR[1...n] is used to indicate that there is a com-
munication error. The specific cause, determined by F_RECVDP, is communicated
using the diagnostics data (system variable $A_FRDP_DIAG[1...n]).
System variable $A_FRDP_ERROR[1...n] is cyclically compared with the corre-
sponding PLC variables FRDP[1...n].ERROR. If unequal, there is a system error
and Alarm 27355 "F_DP: %1 communication, connection %2 reports a system
error %3 (%4)" is output.
© 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
7-267