Communications
configuring
System- and communication configuring D7-SYS - SIMADYN D
3-133
Edition 12.2003
3.10 DUST3
coupling
The DUST3 data transfer protocol is mainly used to exchange data with
SIMATIC S5 or TELEPERM M.
From the SIMATIC S5/TELEPERM M perspective, SIMADYN D behaves
just like a SIMATIC S5/TELEPERM M device, with the restriction, that
telegram fetch is not possible (however test telegrams from
TELEPERM M are responded to).
The data transfer protocol is a 3964(R) protocol with an RK512 computer
coupling protocol overlay (a precise description, e. g. for: SIMATIC S5
COM525).
The data transfer time is 1.15 ms/byte at 9600 baud. The telegram frame
including response telegram is 25 bytes long
(net data length =< 128 bytes).
•
Example: At 9600 baud, it takes: 1.15
∗
(25 + 50) = 86 ms, to transfer
50 bytes of net data
The maximum telegram length is 750 bytes. However, there are coupling
partners (e. g. TELEPERM), which permit a maximum telegram length of
only 128 bytes.
3.10.1 Hardware
structure
The following hardware is required for the DUST3 coupling:
•
CS7 communications module with an SS4 communications module
3.10.2 Configuring
3.10.2.1
Data entries at inputs AT, AR
A channel name and address stage 1 must be specified at input AT/AR.
Data entries for address stage 2 are optional. For address stage 1 and
address stage 2 there is a defined syntax, which is now described:
Address stage 1 consists of:
•
SIMATIC processor number: Precisely one character, value range
"1".."4". This entry is optional and is only practical for transmitters. The
data entry is used to address a SIMATIC processor, as long as the
receiving SIMATIC can handle the multi-processor technology used.
•
Output command with data block and data word:
"ADxxx-yyy"
−
AD:
"Output" "data block"
−
xxx:
Data block, value range 1..255
Application
Data transfer
protocol
Data transfer time
Telegram length
Hardware required
Rules
