Siemens SINUMERIK 840Di Manual page 213

06.03
Configuring the
DP master
Equidistant time
Dialog
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
After 840Di Rack has been inserted, the dialog box for configuring DP master
opens automatically.
Use the Properties dialog box of DP master to make the following settings:
S
PROFIBUS address of DP master
The default setting of the PROFIBUS address is 2. It is recommended to
keep this setting.
S
Subnetwork
S
Equidistant DP cycle
S
Equidistant time.
The SINUMERIK 840Di will accept the set equidistant DP cycle as the NC
system clock cycle and position controller cycle.
position controller cycle = NC system clock cycle = equidistant DP
cycle
The time that can be set for the equidistant DP cycle depends on:
1. The cyclic communication load by the drives and field devices on PROFI-
BUS DP.
2. The capacity utilization of the cyclic position controller level of the NC by the
number of position-controlled machine axes and the active functions.
Dialog: Properties – PROFIBUS Interface DP Master
Tab: Parameters
Address: 2
Subnetwork:
Button: "New..."
Dialog: Properties – New PROFIBUS Subnetwork
Tab: General
S7 subnetwork ID: <Subnetwork ID> (see below: Note)
Tab: Network settings
Data transfer rate: 12 Mbps
Profile: DP
Button: "Options..."
Dialog: Options
Tab "Isosynchronism"
Enabling the equidistant bus cycle:
Equidistant DP cycle: <Isosynchronous time>
OK
OK
OK
Note
It is recommended to put down the S7 subnetwork ID, since it will be needed
later to parameterize the routing settings of the axis start-up tool SimoCom U.
See Subsection 9.1.6, page 9-269.
7 PROFIBUS DP Communication
7.3 SIMATIC S7 project
7-213