Mode of operation of the system
Deutschmann Automation GmbH & Co. KG
19
UNIGATE
®
fieldbus gateway UNIGATE
®
EL - DeviceNet
™
V. 1.0
22.6.17
7
Mode of operation of the system
7.1 General explanation
Communication can be split into seven layers, Layer 1 to Layer 7, in accordance with the
ISO/OSI model.
The Deutschmann Automation Gateways convert Layers 1 and 2 of the customized bus system
(RS485 / RS232 / RS422) to the corresponding Fieldbus system. Layers 3 to 6 are blank, and
Layer 7 is converted in accordance with chapter 7.3.
7.2 Interfaces
The Gateway features the RS232-, RS422- and RS485-interfaces as well as 10/100 Base-T LAN
(RJ-45).
7.3 Data exchange DeviceNet
All data is transferred by the Gateway in dependence of the downloaded Script.
In the DeviceNet the gateway acts as a "Group 2 Only Slave". The access method "Polling", is
supported, which is described below.
7.3.1
Polling
In the event of Polling the DeviceNet-master sends a telegram according to the configured length
to the gateway. The gateway sends out these data via the RS-interface according to the selected
protocol. As an answer the DeviceNet-master receives the latest data received by the RS-inter-
face.
The maximum amount of input- out output data to be configured is 255 Byte.
7.4 Possible data lengths
The table below shows the maximum transferable data in DeviceNet:
.
DeviceNet
Input data (Consumed)
max. 255 bytes
Variable: maximum value in this case
Output data (Produced)
max. 255 bytes
Variable: maximum value in this case
EL
Input- and output data
max. 1536 bytes
dynamic
