Siemens SINAMICS SM120 Operating Instructions & Installation Instructions page 39

Technical data for 322 and 323:
2
● Terminals 1-10:
● Terminals 11-14:
Note
Maximum load current from the 24 VDC auxiliary voltage and the digital outputs
The total load current via terminals 2 and 9 at X321 and 2, 3, 6, and 7 at X322 and X323 of
the 24 VDC auxiliary voltage, together with the digital outputs, is protected by an internal 4 A
fuse. A continuous current of 3 A in total through this fuse must not be exceeded. In your
application, dimension the total load currents from the eight digital outputs and the terminals
of the 24 VDC auxiliary voltage accordingly.
Note
Open digital input
An open input is interpreted as "low".
Connect the MEXT1 or MEXT2 terminals to enable the digital inputs to work. The following
possibilities exist:
● The incorporated ground reference of the digital inputs
● A jumper to terminal M
Note
Diagnostics when the 24 VDC auxiliary voltage fuse ruptures
The 24 VDC auxiliary voltage is protected internally by a 4 A fuse. A ruptured fuse is indicated
by loss of the auxiliary power and/or by a diagnostic message. All digital outputs are also
affected by a ruptured fuse. The user cannot replace this fuse. Replace the component and
send it for repair.
SINAMICS SM120 6SL38855?B
Operating Instructions 12/2015
– Auxiliary voltage: 24 VDC
– Max. total load current of +24 V auxiliary voltage of terminals X321, X322, and X323
combined: See note
– Input voltage range: -3 to 30 V
– Typical current consumption: 10 mA at 24 VDC
– Input delay: For "0" to "1" max. 50 μs; for "1" to "0" max. 100 μs
– Electrical isolation: Reference potential is terminal MEXT1 or MEXT2
– Level (including ripple): High signal level: 15 to 30 V; low level: -3 to 5 V
The analog inputs can be toggled between current and voltage input using switches S5.0,
S5.1, S6.0, and S6.1.
– Voltage: 0 to 10 V; Ri > 100 kOhm; resolution 12-bit
– Current: 0 to 20 mA; Ri = 250 Ohm; resolution 11-bit
In this case, the isolation for these digital inputs is removed.
Description
3.4 Components
39