Cycle And Response Times Of The S7-1500R/H Redundant System; Introduction - Siemens Simatic S7-1500 Function Manual

Cycle and response times of the S7-1500R/H
redundant system
5.1

Introduction

CPUs of the S7-1500R/H redundant system are designed as being redundant. The goal of
the redundant configuration is to avoid production downtimes. When a CPU fails, the other
CPU maintains control over the process.
Compared to non-redundant CPUs, the CPUs of the S7-1500R/H redundant system have
the following special features:
● Longer cycle and response times
● Specific operating and system states
● Additional load and delays through synchronization
Contents of this section
This section describes the effects of the mode of operation of the S7-1500R/H redundant
system on the cycle and response times.
It also describes how to estimate and control the cycle response times of the CPUs. This
prevents excessive cycle times.
Note
Classification of this chapter
The statements in the previous chapters describe the response of an individual CPU.
The section "Cycle and response times of the S7-1500R/H redundant system" supplements
the information of the previous sections with information on the S7-1500R/H redundant
system.
Cycle and response times
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