Analog output modules
D300529 0115 - BL67 I/O modules8-2
8.1 Overview
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 sensor supply (V
O
) is tapped from the internal voltage supply bus.
The module bus electronics of the analog input module
s are galvanically isolated from the field level
via an opto-coupler, and provide reverse polarity protection.
The modules are short-circuit proof.
Supported signal ranges
BL67-2AO-I:
0 to 20 mA
4 to 20 mA
BL67-2AO-V/BL67-4AO-V:
0 to 10 VDC
-10 to 10 VDC
LED displays
Error signals from the I/O level are indicated by ea
ch module via the "D" LED. The corresponding
diagnostic information is transmitted to the g
ateway via diagnostic bits.
8.1.1 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 parameter.
NOTE
8.1.2 Module overview
A detailed description of the measurement value representation for the analog input mod-
ules in 16 or 12 bit can be found in the Appendix of this manual, page 15-8.
Table 8-1:
Module overview
Module No. of channels Short-circuit proof
BL67-2AO-I 2
BL67-2AO-V
2
BL67-4AO-V 4
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