S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
258
Wiring
8.1 Rules and regulations for operation
Introduction
The S7-1500R/H redundant system is a plant and system component. Special rules and
regulations must be adhered to in line with the area of application.
This section gives an overview of the key rules for integration of the redundant system into a
plant or system. Please follow these rules when connecting the S7-1500R/H redundant
system.
Specific application
Observe the safety and accident prevention regulations that are applicable to specific
applications (for example Machinery Directive).
EMERGENCY-STOP devices
EMERGENCY OFF equipment to IEC 60204 (corresponds to DIN VDE 0113) must remain
effective in all operating modes of the plant or system.
Excluding hazardous plant states
Hazardous operating states must not occur when
• The plant restarts after a voltage dip or power failure.
• Bus communication is reestablished following a fault.
• An undefined system state occurs in the S7-1500R/H. Example: Failure of both redundancy
connections ≤ 1500 ms apart (R-system) or ≤ 55 ms apart (H-system).
If a hazardous operating state occurs, force an EMERGENCY STOP.
An uncontrolled or undefined redundant system startup must not occur after the
EMERGENCY STOP device is unlocked.
External fuses/switches
Install the external fuses/switches in the proximity of the R/H-CPUs.
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