Siemens SINUMERIK 840D sl Commissioning Manual page 82

PLC interface
11.1 Program selection
DB 19 (PLC → HMI sl)
Index 1 to 3 for program lists:
Storage on the CompactFlash card in the following folder:
For end user: User/sinumerik/hmi/plc/programlist
For machine manufacturer: Oem/sinumerik/hmi/plc/programlist
For system: Siemens/sinumerik/hmi/plc/programlist
An index in the specified program list refers to the NC program.
DB 19 (PLC → HMI sl)
DBB17
Acknowledgment byte of the HMI sl for the current data transfer status.
DB 19 (HMI sl → PLC)
DBB26
References:
Function Manual Basic Functions: Various NC/PLC interface signals and functions (A2)
Job processing
A PLC job is processed according to the following scheme:
● The PLC may only initiate a job in the job byte if the acknowledgment byte is 0.
● The HMI sl mirrors the job (excluding the parameter set) in the acknowledgment byte
● Once the operation is finished (without error or with error), the PLC must respond again
● The HMI sl then sets the acknowledgement byte to 0. This ensures a sequential
76
Bit 7 Bit 6
Part program handling: Index of the file to be transferred from the user list.
Bit 7 Bit 6
Selection
(signaling to the PLC that its job is being processed). The PLC receives a "job active"
signal for an unfinished job.
and delete the job byte.
procedure.
Bit 5 Bit 4 Bit 3
Bit 5 Bit 4 Bit 3
Active
Commissioning Manual, 01/2008, 6FC5397-1DP10-3BA0
Bit 2 Bit 1 Bit 0
Bit 2 Bit 1 Bit 0
Error OK Res. for
PLC
HMI sl (IM9)