Data Sheet for Product

14
Siemens CB1Q3903en
Smart Infrastructure 2020-04-08
Interfaces
Periphery bus
● For connecting I/O Modules
● Power supply:
– via controller
– separately AC/DC 24 V
● Connection via plug at bottom right of the controller
– local (board-to-board)
– remote (board-to-wire)
Power supply via controller See section "Power supply" of the controller
Separate power supply 96 VA limits also apply. Calculation per Q3900
Bus termination (fix) 680 Ω / 120 Ω +1 nF / 680 Ω
Board-to-board (not included)
Board-to-wire (not included)
ZEC1.0/4-LPV-3.5 GY35AUC2CI1
ZEC1.0/4-ST-3.5 GY35AUC1R1.4
Solid wire 0.2…1.0 mm²
Stranded wire (twisted and with ferrules) 0.2…1.0 mm²
Bus cable Shielded if length > 3m , twisted pair
Max number of extension modules 31 (1…31, 0 not usable).
Recommended: not more than 10.
Cable lengths Total max. 30 m
Local Local
Remote Remote
Process bus CE+, CE- (T7)
Based on KNX TP1
Bus connection (twisted pair) CE+, CE- (not interchangeable)
Bus electronics Galvanically separated
Bus load Max. 5 mA
Bus cable Must be shielded (see KNX Manual “System
Specifications”)
Bus cable length between 2 KNX nodes Max. 700 m
Total length of KNX bus cable Max. 1,000 m
Bus power supply via Internal DPSU with 50 mA rated current
External standard KNX power pack