Configuration Options
3-25
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
3.6 Clocking
Features
Reproducible response times (i.e. of the same length) are achieved for the
SIMATIC with an equidistant DP bus cycle and the synchronization of the following
free-running individual cycles:
Free-running cycle of the user program. On account of acyclic program
branching the length of the cycle time can vary.
Free-running, variable DP cycle on the PROFIBUS subnet
Free-running cycle on the DP slave backplane bus
Free-running cycle for signal conditioning and conversion in the electronic
modules of the DP slaves
With equidistance, the DP cycle is synchronized and has the same length. The
sequence layers of a CPU (OB 61 to OB 64) and the clocked I/O are synchronized
in this cycle. The I/O data are transferred at defined and constant intervals
(clocking). The maximum jitter is 10s.
Requirements
Clocking is possible with the IM 151-1 HIGH FEATURE with the following
STEP7 versions and modules:
STEP 7
Version
Module Order Number As of
Product
Version
As of V5.1 with 2DI 24 VDC High Feature 6ES7 131-4BB00-0AB0 1
ServicePack 3
and Hotfix 1
4DI 24 VDC High Feature 6ES7 131-4BD00-0AB0 1
and Hotfix 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
with
ServicePack 4
1Count 5V/500kHz 6ES7 138-4DE01-0AB0 1
1SSI 6ES7 138-4DB01-0AB0 1
Other modules are possible in the ET 200S configuration but these do not support
clocking.
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