12 RSTi-EP Functional Safety Manual GFK-2956A
Configuration
An EP-19xx module can be positioned anywhere in the RSTi-EP station. Each safety segment might
include at most 12 switchable modules. Multiple EP-19xx modules and thus safety segments can be
set up in a single station.
When planning a RSTi-EP station with EP-7641 modules, the following requirements must be met:
• The overall current consumption of all switchable modules within a safety segment must be
lower than 100 mA (refer to the table Switch-off Delay and current Consumption).
• Each safety segment might include at most 12 switchable modules.
• The switch-off delay time (discrepancy time) for the safe input channels within a safety circuit
is 500 ms ± 10 ms.
• The load output is not designed for either inductive or capacitive loads.
• The station must be safeguarded with a 8-A super fast fuse.
• A SELV/PELV power supply must be used.
• The safely shut-off systems/applications must get their power only from the safe feed-in
module EP-19xx. Likewise, it must not be possible to feed external energy into the safety
segment elsewhere.
• Relay modules can be located after the safe feed-in module; however their outputs cannot
be safely shut off in case of a malfunction.
• At the SS1 output of the EP-1922, only systems/equipment that do not feed any power back
into the system in the event of a malfunction can be connected.
• Any external short circuits in the wiring of the safe output must be avoided.
• Fault exclusion as per EN ISO 13849-2 must be provided.
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