Siemens SINAMICS S120 Function Manual page 500

Communication PROFIBUS DP/PROFINET IO
10.2 Communication via PROFIBUS DP
Name Value
MSG
RES
R
T
M
GAP
T
J
1) The values correspond to the device master file si0280e5.gs_and a sample project
Setting criteria for times
● Cycle (T
● T
● A tool is available for setting and optimization purposes (e.g. HWConfig in SIMATIC S7).
Minimum times for reserves
Table 10- 45 Minimum times for reserves
Basic load
Per slave
Per byte of user data
One additional class 2 master
500
Limit value
1)
)
DP
– T must be set to the same value for all bus nodes.
DP
– T > T and T > T
DP DX DP
T is thus large enough to enable communication with all bus nodes.
DP
NOTICE
After T has been changed on the PROFIBUS master, the drive system must be
DP
switched on (POWER ON) or the parameter p0972=1 (Reset drive unit) must be set.
and T
I O
– Setting the times in T
position control loop.
– T > T + T
O DX Omin
The following must be noted:
– Configuring reserves allows the following:
Class 2 masters can be connected
Non-cyclic communication
Data
Acyclic service
After cyclic transmission, the master checks whether the token
hold time has already expired. If not, another acyclic DPV1
service is transmitted.
Reserve: "Active pause" until the isochronous cycle has expired
Processing time for speed or position controller
Master time
This is the time from the start of the position controller cycle to
the start of master closed-loop control.
Attempt to open connection with new node.
This attempt takes place every xth cycle.
T returns the duration of the cycle jitter.
J
The cycle jitter is the delay of the GC telegram.
O
and T to be as short as possible reduces the dead time in the
I O
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Description
Time required [µs]
300
20
1,5
500
Drive functions