Cycle and response times of the S7-1500R/H redundant system
5.3 Influences on the cycle time of the S7-1500R/H redundant system
Cycle and response times
62 Function Manual, 10/2018, A5E03461504-AD
Differences between the synchronization times
The available bandwidth has a significant impact on the synchronization time.
With the R-CPUs both the synchronization of data and the synchronization of communication
tasks operate over the PROFINET ring. 25% of the bandwidth is reserved for the
synchronization.
With the H-CPU, synchronization works independently of the PROFINET ring over fiber optic
cables. The full bandwidth on the PROFINET cable is available for PROFINET IO
communication.
The table below provides an overview of performance features of R-CPUs and H-CPU.
Table 5- 1 Performance features of S7-1500R and S7-1500H
• Data transfer rate of 100 Mbps (for synchronization
and communication)
• Significantly greater performance than
S7-1500R due to
– Separate redundancy connections
over fiber-optic cables
– Greater computing power
• Transmission rate of 1 Gbps (for the
synchronization)
• Data work memory: max. 8 MB
• Code work memory: max. 2 MB
• Data work memory: max.
1.5 MB
• Code work memory:
max. 300 KB
• Data work memory:
max. 3 MB
• Code work memory:
max. 500 KB
• The CPUs are identical in design with the respective
S7-1500 standard versions.
• The synchronization of the CPUs takes place over the
PROFINET ring.
• The H-Sync-Forwarding function is recommended for
all devices in the PROFINET ring.
• Part of the bandwidth on the PROFINET cable is
used to synchronize the CPUs. Less bandwidth is
therefore available for PROFINET IO communication.
• The CPUs each have two optical inter-
faces.
• The synchronization of the CPUs
operates independently of the
PROFINET ring over fiber-optic ca-
bles.
• The full bandwidth on the PROFINET
cable is available for PROFINET IO
communication.
More information about the technical specifications is available in the manuals of the specific
CPUs.
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