13
Siemens Schweiz AG
A6V11646018_en--_e
Smart Infrastructure
2021-06-11
Connection terminals
68 69 70
3
4
5
6
7
8
9
Terminal
Symbol
Description
Module
Channel
1, 2
2 x RJ45 interface for Ethernet with switch
3, 4
KNX
PXC4.E16: KNX PL-Link (for future use)
5, 6
24 V ~,
⏊
Operating voltage AC 24 V
7
Functional ground (must be connected on the installation side with
the building grounding system (PE).
8 to 29
Ux
Universal inputs/outputs
61
1…12
⏊
Measuring ground for Ux
8, 19
V+
DC 24 V power for field devices 2.4 W / <100 mA
18, 29
V~
AC 24 V power for field devices 48 VA / 2 A
68, 69, 70 COM
PXC4.E16: Interface EIA-485 (Modbus RTU)
Term
on, off
PXC4.E16: Switch for bus termination
Polar
on, off
Switch for polarization
75 to 86
DOx
Relay outputs
11
1…4
Wiring lines for field devices
Wiring length max. 300 m (1,000 ft), CU wire or CU strand.
Cross-section depending on the signal
30 m (100 ft) applies for signal types AI NTC10K and AI NTC100K
or 80 m (260 ft) with shielding
Examples of connection diagrams for universal inputs/outputs
Digital inputs
Ux
Ux
S1
S2
Feedback contact (NO)
Feedback contact (NC)
Count inputs:
Counter inputs, that count faster than 1 Hz and are laid with more than 10 meters using analog inputs in
the same cable duct, must be shielded.
