Release: 02.0
2017-01-13
Page 75
6.6.1 Development of transfer values
Due to the various fieldbus interfaces, the command range of the individual commands
is variable. Depending on the interface, commands of 1-32 bits can be widely defined.
Depending on the defined command range, the transmission values must be calcu-
lated. For this reason, a command range of 8-16-32 bits is recommended when using
a Profibus interface. An example of the calculation of the transfer value, depending on
the defined command range using the intensity command:
The aflex intensity is controlled from 0-100%. Where 100% is the maximum possible
value. For a 16-bit command, therefore, 65535. The transfer value can be calculated
using the following formula:
𝑀𝑎𝑥 𝑉𝑎𝑙𝑢𝑒 8𝐵𝑖𝑡 = 255
𝑀𝑎𝑥 𝑉𝑎𝑙𝑢𝑒 16𝐵𝑖𝑡 = 65535
𝑀𝑎𝑥 𝑉𝑎𝑙𝑢𝑒 32𝐵𝑖𝑡 = 4294967295
𝑉𝑎𝑙𝑢𝑒 =
𝑀𝑎𝑥 𝑉𝑎𝑙𝑢𝑒
100%
∗ 𝑡𝑎𝑟𝑔𝑒𝑡 𝑝𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒[%]
If the intensity (defined as 16Bit wide) is set to 75%, the value "49151" must be trans-
mitted.
A special case is the vibration frequency, which is transmitted in heart [Hz] by a factor
of 10. Thus, a frequency of 56.4 Hz corresponds to a value of 564. For this reason, the
frequency must be addressed with at least 16 bits. However, the vibration frequency
of the aflex is generally not separately controlled, since this is already set when loading
a configuration.
The direction of conveyance is addressed via the "Direction" command. The aflex is
divided into a circular coordinate system. The resolution is also dependent on the bit
width.
𝐷𝑖𝑟𝑒𝑐𝑡𝑖𝑜𝑛 𝑉𝑎𝑙𝑢𝑒 =
𝑀𝑎𝑥 𝑉𝑎𝑙𝑢𝑒
360
∗ 𝑡𝑎𝑟𝑔𝑒𝑡 𝑑𝑖𝑟𝑒𝑐𝑡𝑖𝑜𝑛[°]
Figure 70 aflex Direction
0°
90°
180°
270°
