Conversion Of The Valve Zone - Aventics DeviceNet Description Du Système Et Notice D'emploi

116 AVENTICS | Bus Coupler AES/Valve Driver AV, DeviceNet | R412018138–BAL–001–AC
Conversion of the Valve System
Example:
The I/O zone consists of three different modules with the following PLC configuration keys:
Table 28: Example of a PLC configuration key for the I/O zone
PLC configuration key
for the I/O module
8DI8M8
24DODSUB25
2AO2AI2M12A
The left end plate is not reflected in the PLC configuration key.
The length of the input or output bytes can be found in the system description of the individual
I/O module.
If you do not have the system description of the module at hand, you can calculate the input and
output data lengths by observing the following guidelines:
For digital modules:
Divide the number of bits by 8, to find the length in bytes.
– For input modules, the value is the input data length. There is no output data.
– For output modules, the value is the output data length. There is no input data.
– For I/O modules, the total output and input bytes are the lengths of the output and input data,
respectively.
Example:
The digital module 24DODSUB25 has 24 outputs.
24/8 = 3 bytes output data
For analog modules:
1. Divide the resolution of an input or output by 8.
2. Round the result up to a whole number.
3. Multiply this value by the number of inputs or outputs. This number is the length in bytes.
Example:
The analog input module 2AI2M12 has 2 inputs with a resolution of 16 bits each.
16 bits/8 = 2 bytes
2 bytes x 2 inputs = 4 bytes input data

12.5 Conversion of the valve zone

The symbols for the valve zone components are explained in section 12.2 "Valve zone"
on page 107.
Characteristics of the I/O module
8x digital input channels
8x M8 connections
24x digital output channels
1x DSUB plug, 25-pin
2x analog output channels
2x analog input channels
2x M12 connections
Additional actuator voltage
connection
Data length
1 byte input
0 bytes output
0 bytes input
3 bytes output
4 byte input
4 bytes output
(Bits are calculated from
the resolution of the analog
channels, rounded up to whole
bytes, times the number
of channels)