System Configuration Rules - Siemens SIRIUS 3SK1 Manual

6.3

System configuration rules

General information
● If a basic unit is operated as a stand-alone device, no device connector or device
termination connector is necessary.
● 3SK1220 input expansions and the 3SK1230 power supply must always be connected on
the left of the basic unit and output expansions (3SK121 and 3RM1 Failsafe motor
starters) on the right.
Expansion on the input side
● The 3SK1230 power supply must always be plugged into the system on the extreme left.
● No more than one 3SK1230 power supply is admissible for each system.
● If a 3SK1230 power supply is used, no additional, external 24 V DC voltage is permitted
to be connected to a basic unit.
● If an (additional) input expansion is detected on the left when the basic device or an input
expansion powers up, it will be loaded into the device configuration.
● An input expansion evaluates the sensor states and generates an enable signal for the
basic unit depending on the start condition. The enable signal is then acquired by an
input expansion on the right-hand side, or acquired by the basic unit and ANDed with its
sensor statuses.
You can find information on the start characteristics in the system configuration of the
3SK1 Advanced in the chapter "Explanation of the device's function (Page 190)".
● The 3ZY12 device connector used below the final device must be fitted with a cover on
the left side (included with the device termination connectors).
Output expansion
● If an output expansion is detected on the right when the device powers up, this will be
loaded into the device configuration. The internal feedback circuit of the contact extension
is evaluated and checked.
● If both 3SK1211 and 3RM1 Failsafe motor starters are used in one system, the 3RM1
Failsafe motor starters must be placed on the right of the 3SK1211 devices.
● If a 3SK1213 output expansion is used in the system, this must always be the final station
in the system (on the right) and must be fitted with a 3ZY1212-0FA01 device termination
connector. Only one 3SK1213 output expansion can be used in the system with a device
connector; further 3SK1213 output expansions can be optionally interfaced by wiring.
● On the 3SK121 output expansions, a slide switch on the device front must be used to set
whether the UNDELAYED, or DELAYED output signal of the basic unit is to trigger a
response. If a purely instantaneous 3SK112 basic unit is used, the slide switch MUST be
set to the "UNDELAYED" position.
● In the case of a change to the device configuration during operation, error mode is
activated immediately. Restarting must be triggered via Power OFF/ON.
SIRIUS 3SK1 safety relays
Manual, 06/2018, A5E02526190021A/RS-AD/004
System configuration
6.3 System configuration rules
109