Networking Rules - Siemens SINUMERIK 840DiE sl Manual
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- Diagnostic manual (1054 pages) ,
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8 PROFIBUS DP Communication
8.1 General
8.1.5
Networking rules
8-178
T
Input time: Time of the actual value acquisition. The actual values are
I
transferred to the DP master in the next DP cycle.
T
Output time: Time of the setpoint transfer. The setpoints were
O
generated by the DP master application in the previous DP cycle.
GC
Global control message frame (broadcast message frame) for
cyclic synchronization of the equidistance between the DP
master and DP slaves
R
Speed or position controller computing time
Dx
Exchange of user data between DP master and DP slaves
DPV1
After cyclic communication, an acyclic service is sent,
if the token holding time T
calculated by the configuring system.
G T R
G: GAP
An attempt is made during GAP to accept new active stations.
T: TOKEN
The token passing is either to itself or other masters.
D: RES
The reserve is used as an "active pause" for the station to send the token
to itself until the isochronous cycle is terminated.
1
The actual values for the current DP cycle/position control cycle
are transferred from the DP slave drives to the NC position controller
2
The setpoints computed by the NC position controller are transferred
to the DP slave drives
The following basic rules must be observed:
1. The bus line must be terminated at both ends. For this purpose, enable the
terminator in the PROFIBUS DP connector of the first and of the last nodes
and disable the remaining terminators.
Notice
Only two enabled terminating resistors are permitted per bus line.
2. At least 1 terminal must be supplied with 5 V.
This is done by connecting an PROFIBUS DP connector with the terminat-
ing resistor inserted to an energized device.
3. No tap lines may be routed on the PROFIBUS DP.
4. Every PROFIBUS DP node must first be connected and then activated.
When disconnecting a node, first deactivate the connection and then re-
move the connector.
5. The cable of a PROFIBUS DP bus segment may be max. 100 m.
is not yet exceeded. T
TH
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
01/2007
is
TH
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