Siemens SINUMERIK 840Di - Page 224

06.03
7.3 SIMATIC S7 project
7-224
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
The default setting with regard to the consistency of the I/O data is whole
length.
This setting results in:
S Direct accesses from the PLC user program (e.g. byte, word or double word)
to this address range are not admitted by the PLC operating system.
S Accesses to this address range must be carried out using the system func-
tions SFC 14 and SFC 15.
S The system functions SFC 14 and SFC 15 guarantee consistent reading/
writing of the data of an axis.
Note
The terms isochronous, clock-synchronous, and equidistant (same length) are
used as synonyms in various documents.
Function parameters
In dialog box: DP slave properties –> Encoder tab, the function parameters are
entered (see Fig. 7-4 with sample values for the individual parameters).
1st Axis 2nd Axis
Shutdown ramp [ms]:
Shutdown delay [s]:
Unipolar spindle
Encoder 1 Encoder 2
Encoder type:Encoder type:
TTL
DP slave properties
ConfigurationGeneral
TTL
OK
3rd Axis 4th Axis
Tolerable sign-of-life errors:
Reserved bits for fine resolution:
611U conformant mode
HelpCancel
Encoder 4Encoder 3
Encoder type: Encoder type:
Resolution:
Parity
EncoderClock synchronization
SSI SSI
Encoding
MsgLength:
Encoding:
Binary Gray
Baudrate:
187.5 kbps
Parity
Resolution:Resolution:Resolution:
187.5 kbps
Baudrate:
MsgLength:
6000 6000 20482048
2121
11
5
0
1
Fig. 7-4 Dialog: DP slave properties, tab card: Encoder
Consistency
7 PROFIBUS DP Communication