User Manual

4.7.1 5V Logic Supply
This is produced from the supply voltage after rectification and smoothing via a DC/DC
converter. A reset generator monitors the voltage; it is triggered at a voltage of approx.
4.55 V at which it generates a reset.
4.7.2 30 VDC supply
This is produced directly from the supply voltage after rectification and smoothing.
Since the voltage is not controlled, it can vary in a range of approx. 26...35 V.
The voltage is used to supply the binary inputs/outputs and the complete analog
section. It is also brought out to module connectors X15 and X16.
The analog voltage value can be acquired via controller input AN14 (port pin P5.14).
4.7.3 12 V Output
In order to supply the external HMI, a 12 VDC supply voltage is generated from the
rectified 24 VAC via an in-phase regulator.
The 12 V output is monitored to approx. 10 V via a comparator.
The comparator output can be interrogated via the software through controller input
AN15 (port pin P5.15).
Additionally, the analog value of the 12 V supply can be acquired via controller input
AN13 (port pin P5.13).
The 12 VDC supply voltage output has the following features:
• Maximum load current 50 mA
• The 12 V output is short-circuit proof.
The 12 V supply voltage is brought out to connector X13.
Connector X13
12 V output
X13.6; X13.7 +12 V
X13.1; X13.8 GND
27/42
Siemens Building Technologies Hardware Description CE2P3689en
HVAC Products Hardware 25.11.2004