Multiplexer (Transmission Of Analog Values) - CARLO GAVAZZI G3800 X015 - CONFIGURATION SOFTWARE User Manual

G 3800 X015 Configuration Software G 3800 X015 Configuration Software G 3800 X015 Configuration Software G 3800 X015 Configuration Software

2.6.2. Multiplexer (transmission of analog values)

Description
The (original) multiplexing of analog values makes it possible ot read and write Dupline multiplex analog val-
ues. As opposed to AnaLink transmission with analog sensors, two addresses are needed in stead of one,
which allows transmission of accurate analog values. The transmission speed is also higher. A full analog val-
ue needs one bus cycle, at best. AnaLink values need 256 cycles.
While for the transmission of counter values (see chapter 2.6.1.) only input modules are available, various
Dupline output modules are available for multiplex analog values. The output modules have the output ranges
0..20 mA, 4..20 mA and 0..10 V.
In connection with the configuration of the multiplexer in the Basic setup (Options Multiplexer Count and Mul-
tiplexer delay), the Configuration software automatically reserves four channels (A1..A4) for addressing the
modules. The addressing on these channels is performed automatically by the Master Generator. Data is
transferred on two consecutive address groups (C/D, E/F, G/H, I/J, D/L, M/N and O/P). The channels can be
set individially to the applied modules and can thus not be reserved by the Master Generator.
Also when the number is limited to 16 because only four channels have been reserved, 112 values can actual-
ly be processed. This is possible because up to 7 analog channels receive the same binary address, but sub-
sequently transmit the values to different channel groups. (see above).
Note: The reserved addresses must not be used for other purposes, eg to output switch commands.
Module configuration
Transmission of analog values requires correct setting of the analog modules. Apart from the setting of the
transmission channels, it is also necessary to assign a binary address to each module. Details can be found
in the datasheets.
Data format
Within the two channel groups (in this case C and D), the value "1957" is generated continuously.
Time
Channel
Factor
Example:
Channel
state:
Value
Signal available means that an input module continuously provides the value
Value valid indicates that the value is valid
An "0" stands for a positive value
An "1" stands for a negative value
66
• Function: Object for detection of max. 112 analog values
• Application: Fast transmission of multiplexed analog values through Dupline analog modules
• Configuration under the option "Multiplexer channels" in the Basic setup
Value in hundreds
C1 C2 C3 C4 C5
1 8
1 1 0 1 1
1
Value in tens
C6 C7 C8 D1 D2
4 2 1 8 4
0 0 1 0 1
9
© 2002 Carlo Gavazzi Industri A/S. All rights reserved
October 2002 October 2002 October 2002 October 2002
Single-digit value
D3 D4 D5 D6 D7 D8
2 1 8 4
0 1 0 1
5 7
2 1
1 1