Siemens SIMATIC ET 200S - Clocking on PROFIBUS DP

Configuration Options
3-28
ET 200S Distributed I/O System
EWA-4NEB 780602402-12
3.7 Clocking on PROFIBUS DP
Features
Reproducible response times (i.e. of equal length) are achieved in SIMATIC with
an equidistant DP bus cycle, synchronization of the user program on the DP bus
cycle, and the clocked transfer of I/O data to the I/O modules. The clocked
sections of the user program are processed synchronously to the DP bus cycle by
means of clocked interrupts (OB 61 to OB 64). The I/O data are transferred at
defined and constant (clocked) intervals via the backplane bus of the DP slave to
the I/O modules and switched through synchronously to the terminal.
In other words, clocking results in the synchronization of all the previously cyclic
single cycles from the user program in the CPU to the DP cycle on the PROFIBUS
subnetwork, to the cycle in the DP slave and, finally, to the cycle in the I/O
modules of the DP slaves. The maximum jitter is 10 µs.
Prerequisites
• Clocking is possible with the IM 151-1 HIGH FEATURE with the following
STEP 7 versions and modules:
STEP 7
version
Module Order number As of
product
version
As of V5.1 with
S
i
P
k
3
2DI 24 VDC High Feature 6ES7 131-4BB00-0AB0 1
ServicePack 3
a
n
d
H
o
t
f
i
x
1
4DI 24 VDC High Feature 6ES7 131-4BD00-0AB0 1
a
n
d
H
o
t
f
i
x
1
2DO 24 VDC/0.5 A High Feature 6ES7 132-4BB00-0AB0 1
2DO 24 VDC/2 A High Feature 6ES7 132-4BB30-0AB0 1
As of V5.1
with
1Count 24V/100kHz 6ES7 138-4DA03-0AB0 1
w
i
t
h
ServicePack 4
1Count 5V/500kHz 6ES7 138-4DE01-0AB0 1
1SSI 6ES7 138-4DB01-0AB0 1
As of V5.2 4DI 24-48 VUC High Feature 6ES7 131-4CD00-0AB0 1
2AI U High Speed 6ES7 134-4FB51-0AB0 2
2AI 2 WIRE HS 6ES7 134-4GB51-0AB0 2
2AI 4 WIRE HS 6ES7 134-4GB61-0AB0 2
2AO I High Feature 6ES7 135-4MB01-0AB0 1
2AO U High Feature 6ES7 135-4LB01-0AB0 1
Other modules are possible in the ET 200S configuration but these do not support
clocking.