ETAS
Outputs to the Sensor Power Supply
ES930.1
-
User Guide
49
7
Outputs to the Sensor Power Supply
The ES930.1 is equipped with four outputs for the power supply of sensors that
are available at the connections "AI 1-4" and "AI 5-8".
7.1
Channel Groups
The two sensor supply voltage channels at the "AI 1-4" connection and the two
sensor supply voltage channels at the "AI 5-8" connection are combined into
channel groups.
• Channel group at "AI 1-4" connection:
Sensor power supplies, channel 1 and channel 2
• Channel group at "AI 5-8" connection:
Sensor power supplies, channel 3 and channel 4
7.2
Assemblies of the Sensor Supply Channels
7.2.1
Overview
Fig.
7
-
1
Sensor Supply Voltage Channel
The four sensor supply voltage channels of the ES930.1 feature an identical
design and provide four individual, separately configurable sensor supply volt
-
ages. Each channel consists of the following assemblies (see block diagram in
Fig.
49):
• D/A converter
• Overcurrent protection
• Overload detection
The functionality of all sensor supply voltage channels can be configured sep
-
arately. An additional external power supply device for the sensor supply volt
-
age is not required. In each channel, the sensor supply voltage is generated
from the module operating voltage.
7.2.2
D/A Converter
The 14-bit D/A converter of the channel transforms the digital input signal pro
-
vided by the output unit into a changeable sensor supply voltage. The user can
switch off the sensor supply voltage of each sensor channel in the application
program, select one of the predefined values b5
V and +15
V or enter
or specify any value within the range of values.
Overcurrent
Protection
Sensor Supply Channel n
14 Bit D/A
Converter
Output Unit
Diagnosis
Unit
Overload
Detection
Overcurrent
Protection