Mode Of Operation Of The System; General Explanation; Interfaces; Data Exchange Devicenet - DEUTSCHMANN AUTOMATION UNIGATE CL - DeviceNet Instruction Manual

Mode of operation of the system

8 Mode of operation of the system
8.1

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 8.3.
8.2

Interfaces

The Gateway features the RS232-, RS422- and RS485-interfaces.
8.3

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.
8.3.1

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.
8.4

Possible data lengths

The table below shows the maximum transferable data in DeviceNet:.
Input data (Consumed)
Output data (Produced)
18 UNIGATE
max. 255 bytes
max. 255 bytes
®
fieldbus gateway UNIGATE
Deutschmann Automation GmbH & Co. KG
Variable: maximum value in this case
Variable: maximum value in this case
®
CL - DeviceNet V. 2.8
™
29.6.20