i2o, a new peer-to-peer technology from industrial I/O specialist Acromag
is helping companies minimise costs when transmitting data over
mobile networks. Acromag’s peer-to-peer technology, i2o allows two or more
modules to talk to each other without requiring any network master or special
The i2o technology operates over any standard Ethernet media, Cat 5 or 6
copper cables, fibre optics, radios or mobile networks. When using a mobile
modem, it is important to minimise connection times and the amount of data as
mobile service providers charge by the amount of data being transmitted over
In this application, an Acromag XT1211-000 module with 8 differential
current inputs sampling a 4-20mA signal from a field transmitter is sending
data using i2o to an Acromag XT1531-000 with 4 current outputs. The mobile
modems at each end are transparent to the Acromag I/O and transmit the data
over the network.
On the i2o mapping page, the XT1211 input module is configured for each input
channel. A target IP address and a Modbus register (output channel) are
There are three important features in the XTs that allow i2o to be utilised
over mobile networks to reduce costs:
This can be any setting from 5 to 65535 seconds. It is a periodic
transmission to update the output status based on the input to output scaling.
Keep Target Sockets Open
If this box is not checked during the i2o messaging, a socket will be
opened, data exchanged and the socket closed.
This is the difference in input span between the present input
measurement and its last measurement when an i2o message was sent. If the input
changes by the percentage change threshold or greater, an i2o message will be
XT1211-000: 8-channel differential analogue current input module
XT1531-000: 4-channel analogue current output, 4-channel digital I/O
module, Modbus/TCP and i2o protocol
Acromag is represented in Australia and New Zealand by Metromatics.
For further information, please visit the
Metromatics website www.metromatics.com.au or call (07) 3868-4255.