UM EN FLX ASI SYS PRO INST - Onlinecomponents.com
UM EN FLX ASI SYS PRO INST - Onlinecomponents.com
UM EN FLX ASI SYS PRO INST - Onlinecomponents.com
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1.6 Different data transmission types<br />
(Single/Combined Transaction)<br />
Fieldline Extension and the AS-Interface System<br />
Single Transaction<br />
AS-Interface Single Transaction permit a maximum information exchange of 4 bits.<br />
Combined Transaction<br />
Table 1-2<br />
AS-Interface Combined Transaction (CTT1..5) permit an information exchange of more<br />
than 4 bits. Further data exchange rules are needed to implement additional functions<br />
requiring a higher data width with AS-Interface such as analog transmission or I/O versions<br />
with inputs and outputs > 4. These rules are defined in Combined Transaction.<br />
The data transmission package remains unchanged to ensure backwards <strong>com</strong>patibility to<br />
older profiles. Profiles with Combined Transaction use the multiplex procedure to transmit<br />
more than 4 data bits. That means that more than one cycle is used to transfer the data.<br />
As data is transmitted in several cycles, this method could possibly cause higher transmission<br />
rates than a network without Combined Transaction.<br />
List of "Combined Transaction" (selection)<br />
Combined Transaction type Example of a Master profile required Function<br />
slave profile<br />
Type 1 S-7.3 M3 Analog transmission<br />
Type 1 S-7.4 M3 Extended analog transmission<br />
Type 3 S-7.A.7 M4 4IN/4OUT in extended addressing mode<br />
Type 3 S-7.A.A M4 8IN/8OUT in extended addressing mode<br />
Type 4 S-7.A.8 M4 16IN in extended addressing mode<br />
Type 5 S-6.0 M4 Fast analog transmission 16 bits<br />
online<strong>com</strong>ponents.<strong>com</strong><br />
7513_en_01 PHO<strong>EN</strong>IX CONTACT 1-7