Basic Structure - Siemens SINAMICS S120 Function Manual

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Function modules

9.9 Master/slave function for Active Infeed

Basic structure

DRIVE-CLiQ can be used to connect an Active Line Module (ALM) to a Control Unit (CU) and

Voltage Sensing Module (VSM) to create an infeed train. A Motor Module together with a

Sensor Module Cabinet (SMC) or Sensor Module External (SME) forms a drive train. A Control

Unit controls the complete drive system.

If one of the components develops a fault, only the affected train will fail. This failure can be

signaled, e.g. via read parameter r0863.0, as a message to the higher-level controller. The fault

is evaluated in the user program of the higher-level controller, which sends corresponding

signals to the other infeed units. If a higher-level controller is not used, the fault can be

evaluated by means of DCCs in the Active Line Modules.

All the other trains remain fully functional, which means that they can continue operating

● The "Master/Slave" function only works in conjunction with Active Line Modules.

● One Active Line Module is the master and up to three others are slaves.

● If the master fails, a slave ALM takes on the role of the master.

● The redundant infeed units can continue functioning normally even if one infeed train has

● Electrical isolation between the infeed trains is needed on the line side to prevent circulating

currents caused by non-synchronous pulsing patterns.

● The entire infeed system supplies a joint DC busbar (DC link).

● Since the Active Line Module cannot detect whether the DC link is disconnected or a DC-link

fuse has blown, an additional circuit to monitor these states must be installed (DC breaker

checkback function and fuse signaling contacts).

● The higher-level controller communicates with the CUs and Active Line Modules via

PROFIBUS/PROFINET or analog data. If a higher-level controller is not to be used, the

control signals must be hard-wired (e.g. via TM31).

● Infeed trains with different outputs can be combined.

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Drive functions