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10 Analog Output Modules
Analog output modules (AO) receive output values from the gateway via the internal module bus.
The modules convert these values and transmit the corresponding signals for each channel to the
field level via the base modules.
The module bus electronics of the analog input modules are galvanically isolated from the field
level via an optocoupler, and provide reverse polarity protection.
The modules are short-circuit proof.
Supported signal ranges
0…20 mA
4…20 mA
0…10 VDC
-10…+10 VDC
HART
10.0.1 Resolution of analog value representations
In the bipolar mode the digitalized analog values are represented as a two’s complement. The 16 bit
or the 12-bit-representation (left justified) can be chosen by setting the respective module param-
eter.
10.0.2 LED displays
Error signals from the I/O level are indicated by each module via the ”DIA” LED. The corresponding
diagnostic information is transmitted to the gateway via diagnostic bits.
A continuously lit up red ”DIA” LED indicates the failure of the module bus communication at the
analog input module.
10.0.3 Shielding
When using shielded signal cables, the connection between the shield and the base module is
made via a two-pole shield connection, which is available as an accessory.
NOTE
A detailed description of the measurement value representation for the analog output
modules in 16 or 12 bit can be found in the Anhang, s. p. 16.
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