Maximum System Configuration - Siemens SIRIUS 3SK1 Equipment Manual

System configuration
6.1 General information
Note
In the configuration with a 3SK1 Advanced basic unit on a 3ZY12 device connector, 3RM1
Failsafe motor starters can only be controlled by the instantaneous enable signal of the 3SK1
unit. If control of the 3RM1 Failsafe motor starter by means of the time-delayed output is desired,
this can only be done by wiring the time-delayed safety-related outputs of the 3SK1 basic unit.
Information about start response in the system configuration of 3SK1 Advanced units can be
found in the chapter "Explanations of device function (Page 176)".
6.1.3

Maximum system configuration

Changes to the system configuration
Changes to the system configuration in safety mode always result in a device error. Restarting,
by disconnecting and reconnecting the operating voltage (Power OFF/ON), is a mandatory
requirement.
Maximum system configuration when supplying with 24 V DC on the basic unit
Only one 3SK1 basic unit is permitted per system
The safety function is not guaranteed when more than one basic unit is used.
Connection of 24 V DC to the basic unit:
A maximum of 5 expansions are permitted on the left of the basic unit and 5 expansions on the
right.
112
WARNING
5 at the most
Input expansion
DC 24 V
L+ L-
5 at the most
Output expansion
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005