Siemens SINUMERIK 840D sl Function Manual page 250

Connecting sensors and actuators
8.4 Safety-related CPU-CPU communication (F_DP communication)
The wait state for the user acknowledgment is represented in the output data of the user
interface as follows:
● F_SENDDP (NCK)
- $A_FSDP_ERROR[1...n] = 1
- $A_FSDP_DIAG[1...n] = X (value corresponding to the detected communication error)
- $A_FSDP_SUBS_ON[1...n] = 1
● F_SENDDP (PLC)
- FSDP[1...3] or FSDP_HF[4..16]
- .ERROR = TRUE
- .SUBS_ON = TRUE
- .DIAG = X (value corresponds to the detected communication error)
- .RETVAL14 = 0
- .RETVAL15 = 0
● F_RECVDP (NCK)
- $A_FRDP_ERROR[1...n] = 1
- $A_FRDP_DIAG[1...n] = X (value corresponds to the identified communication error)
- $A_FRDP_SUBS_ON[1...n] = 1
- $A_FRDP_ACK_REQ[1...n] = 1
- $A_FRDP_SENDMODE[1...n] = X (value corresponding to the last valid F-telegram)
- $A_INSE = $A_FRDP_SUBS
● F_RECVDP (PLC)
- FRDP[1...3] or FRDP_HF[4..16]
- .ERROR = TRUE
- .SUBS_ON = TRUE
- .ACK_REQ = TRUE
- .SENDMODE = X (value corresponding to the received F-telegram)
- .DIAG = X (value corresponding to the detected communication error)
- .RETVAL14 = 0
- .RETVAL15 = 0
SPL_DATA.INSEP[x...y] = FRDP[1...3].SUBS or FRDP_HF[4..16].SUBS
Note
After an F_DP communication error, to enable F_DP communication, a user acknowledgment
using the interface signal DB18.FRDP_ACK_REI is sufficient.
If, in addition to the F_DP communication, active alarms with NCK responses - and possibly
Stop D/E - are to be reset, then the user acknowledgment must be realized using a channel_1
reset.
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Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated