SIPLUS PSU (6DL3500-8BA)
SIPLUS PSU Power Supply Unit
A5E00854207E
18 of 30
Copyright (C) Siemens AG 2018
V 8.00 released
2018-05-03
5.5 Signaling Outputs
MELD (X21, Pin right)
HIGH-level
LOW-level
Load current (HIGH level)
Short
circuit
current
Digital output DC 24 V, active HIGH (at fault)
min. L1 – 3.0 V resp. L2 – 3.0 V
max. 3.0 V
max. 0.5 A (current sourcing, short circuit proof
towards M)
max. 2.1 A
MELD_N (X21, Pin left)
LOW-level
HIGH-level
Load current (LOW level)
Short
circuit
current
leakage
current
Digital output DC 24 V, active LOW (at fault)
max. 3.0 V
min. L1 – 3.0 V resp. L2 – 3.0 V
max. 0.5 A (current drawing, short circuit proof
towards L)
max. 15 µA (high impedant state)
Line terminal connection
plug connectors, 2-pole
COMBICON MSTB 2,5 HC/ 2-ST-5.08 RDB
min. wire cross-section 0.25 mm
2
or AWG 24
max. wire cross-section 2.5 mm
2
or AWG 12
(see chapter 9 “Order Designations”)
NOTICE
Possible damages of the facility!
At insufficient dimensioning of the wire cross-section the respective line may
be excessive charged. This leads to strong heating of the conductor up to
damage.
The wire cross-section has to be dimensioned according to the short circuit
current of the respective signaling output.
Figure 9: Pin assignment signaling outputs
X21
MELD_N
MELD
L1/L2
M
L Pullup
SIPLUS PSU
(optional)
Figure 10: Schematic diagram signaling outputs
As an option an external pullup can be connected to the MELD_N output in order to generate H-
levels when feeding voltage driven inputs (see fig. 10). The application impedance and the MELD_N
leakage current have to be considered here among other constraints.
