Increased availability as part of Lifecycle agreements:
The work memory code may not be set to more than 80%.
Communication utilization
The following recommendations for communication between two PCS 7-AS can be deduced
from the rules on configuring AS-wide interconnections in the CFC online help:
● AS-wide interconnections can be used for configuration in PCS 7 V7.1 and above. The
advantage with this is that the quantity structures are checked automatically upon
compilation and are captured in the CFC reference data.
● Configurations with the communication blocks based on BSEND/BRCV (e.g. SEND_R from
PCS 7 Library) are preferred in earlier versions:
– Maximum of 50 or 100 frames/second
– Maximum number of nodes: 30 (CPU412/414) or 62(CPU 410-5H/416/417)
● The fastest cycle possible for the blocks is 200 ms for sending and receiving.
● The maximum transmission volume between two partner CPUs in an OB is 4,800 bytes.
● The volume to be transferred is calculated by adding all AS-wide interconnections of a CPU
in bytes per second. The maximum possible volume that can be transferred varies
depending on the CPU and its performance. This figure should not be exceeded.
The following table shows the recommended maximum values for the transmission volume of
a CPU:
CPU 412H V4.5
H system V4
H system V4.5 CPU 410-5H, 414,
416, 417, V5 and
CPU 414H, 417H
V4.5
Recommendation for the overall transmission volume 21 KB/s 30 KB/s 60 KB/s
Portion for the AS-wide communication (default setting
30%)
7 KB/s 10 KB/s 20 KB/s
Recommendation for the number of communication
block instances per second
30 60 120
Increased availability as part of Lifecycle agreements:
The recommended maximum values for the transmission volume may not be exceeded.
Configuring AS functions
8.1 Principles
Compendium Part A - Configuration Guidelines (V8.2)
164 Configuration Manual, 08/2016, A5E38166869-AA
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