Siemens Desigo PXC4.M16 - Page 10

10
Siemens Schweiz AG A6V11937668_en--_l
Smart Infrastructure 2023-12-22
M-bus interface on COM interface (RS485)
Interface type EIA-485, electrically isolated
Baud rate 300, 600, 1200, 2400, 4800, 9600, 19200, 38400.
The maximum baud rate is depending on the
configuration of M-bus S-devices (subordinate devices)
and M-bus repeater.
Internal bus termination 120 Ohm, switchable with DIP switch
Internal bus polarization 270 Ohm pull-up/pull-down resistances, switchable with
DIP switch
Cabling (in-house cabling only)
Cable length
3-wire cable, shielded cable recommended (shield must
be connected to building earth in the mounting panel)
Max. 1000 m (3300 ft)
Protection Short-circuit proof
Protection against faulty wiring with AC 24 V and
DC24V
M-bus level converter including power supply (required) Configuration examples (simple M-bus loads à 1.5mA):
● Up to 2 M-bus devices: STV Electronic, MPW-2
1
● Up to 6 M-bus devices: STV Electronic, MPW-6
1
● Up to 60 M-bus devices: Relay GmbH, PW60
1
1
For STV Electronic level converters, refer to https://www.stv-electronic.de/. For Relay GmbH level converters,
refer to https://www.relay.de/.
The use of these products is a recommendation only. Siemens cannot guarantee functionality nor take over any
warranty for third-party products. This information is subject to change without notice.
KNX PL-Link interface
Type KNX TP1 PL-Link, galvanic isolation
Baud rate: 9.6 kbps
Cabling (in-house cabling only)
Cable length
2-wire cable, 0.75 mm
2
/ AWG20
or 1 mm
2
/ AWG18
With internal supply: Max. 80 m (262 ft)
With external supply: Max. 1000 m (3300 ft)
Internal bus power Max. 50 mA
When using external bus power for KNX PL-Link, switch
off the internal bus power via the ABT Site Tool.
I/O modules TXM bus interface
Nominal voltage DC 24 V
Supply current for I/O modules TXM Max. 300 mA
Connectable in parallel with DC 24 V power supply
module TXS1.12F4
For details, see: TX-I/O- engineering and installation,
CM110562
Protection Short-circuit proof
TXM I/O module plug: No protection against faulty
wiring with AC 24 V
No electric protection.
Use cover