IBA ibaPADU-8AI-U Compact Measurement Modules
IBA ibaPADU-8AI-U Compact Measurement Modules
System integration
Data acquisition with TAP interface / Sniffer
In the above example, the TAP interface is used for acquiring and analyzing the trans
ferred data without interferences. It does not have to be integrated into the configuration
of the EtherNet/IP scanner (master).
The point of installation within the EtherNet/IP network is relevant. The TAP interface
always has to be integrated linearly. You can only acquire data which are transmitted at
this position in the network.
It is therefore recommended to position the ibaBM-ENetIP directly next to the scanner
(master).
32Mbit Flex protocol and ibaFOB-D network
The ibaNet 32Mbit Flex protocol (referred to as “Flex protocol”) is a manufacturer-specific
data transfer protocol by iba AG. This protocol serves to transfer measurement and con
figuration data via FO connections between different iba devices. The PC cards of the
ibaFOB-D/ibaFOB-Dexp series and the ibaFOB-io-USB adapter as well as some devices
for data acquisition support this protocol.
Data amount and sampling rate
The Flex protocol works with a data transfer rate of 32 Mbit/s and supports up to 15
“Flex-capable” devices connected in a ring topology.
With 32Mbit Flex, the data amount and the sampling rate can be flexibly customized. The
data amount transferred per cycle depends on the sampling rate. Generally, the following
applies: The less data are transferred, the higher is the possible sampling rate.
For the signals to be measured, sampling rates of 500 Hz to 100 kHz can be realized,
which correspond to a timebase from 10 µs up to 2 ms. The maximum sampling rate also
depends on the acquisition device and can be found in the device manual. In ibaPDA
you can select even smaller sampling rates down to 1 Hz. This corresponds to a time
base of 1000 ms. In this case, the timebase in the Flex ring is set to 2 ms and in ibaPDA
a subsampling is carried out. Redundant data is discarded by ibaPDA.
With 32Mbit Flex, up to 4060 Bytes per cycle can be acquired and recorded depending
on the sampling rate.
For the max. possible data amount of 4060 Bytes, the cycle time (timebase) is up to
1.4 ms. In the following table, you find reference values for the relation between cycle
time and the max. transferable data amount per cycle.
Timebase
Max data amount
1.4 ms 4060 Bytes
1.0 ms
3100 Bytes
0.5 ms
1540 Bytes
0.025 ms
64 Bytes
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To acquire further samples, especially if several devices are connected in a Flex ring
topology, iba recommends using the simulator integrated in ibaPDA, see chapter 9.3.
The following data types are supported: BYTE, WORD, DWORD, INT, DINT, FLOAT and
DOUBLE in Big/Little Endian format. These data amounts represent the limit values for
the overall data amount on a Flex ring that can be transferred via an FO link.
In a ring with 32Mbit Flex protocol, up to 15 devices can be connected. In the ring, all
configuration and process data are transmitted.
ibaPDA automatically detects the devices in the ring and automatically determines the
maximum possible sampling rate, depending on the type and number of the devices.
In the ring, also other 32Mbit Flex capable iba devices can be integrated, e. g. ibaPADU
S-CM like in the example above. The devices in the ring are addressed using the rotary
switch for the device address (rotary switch S2 for ibaBM-ENetIP).
The individual device in the cascade can work with different access cycles. However,
these cycles have to be an integer multiple of the smallest cycle; e.g: device #1 works
with 0.5 ms, device #2 with 1 ms, device #3 with 4 ms, etc. If the max. data rate is ex
ceeded, ibaPDA issues an error message that advices you to enhance the timebase and
decrease the data amount.
The calculation of the maximum data amount is based on the fastest device in the ring.
i.e. an increase of the cycle time of slow devices in the ring does not lead to an increased
data transfer. Only when the cycle time of the fastest device in the ring is increased, the
data amount can be increased.
For further information about the distribution of the data amount in the Flex ring,
please see chapter 9.3.