Defining the Problem:
Many customers use Acromag’s peer-to-peer i2o network protocol to send analogue or discrete signals over long distances. For example, a 4-20mA signal can be sampled by an analogue input network module, and then using i2o technology, transmit that information to a companion analogue output network module at a remote location. The network (Ethernet) interface can be transmitted wirelessly by using radio or cellular modems. These modems are transparent to the Ethernet signal and merely forward the Ethernet packets to the far end. When using a mobile modem, it is important to minimise the connection time and amount of data being sent, since mobile service providers charge by the amount of data being sent.
Many customers use Acromag’s peer-to-peer i2o network protocol to send analogue or discrete signals over long distances. For example, a 4-20mA signal can be sampled by an analogue input network module, and then using i2o technology, transmit that information to a companion analogue output network module at a remote location. The network (Ethernet) interface can be transmitted wirelessly by using radio or cellular modems. These modems are transparent to the Ethernet signal and merely forward the Ethernet packets to the far end. When using a mobile modem, it is important to minimise the connection time and amount of data being sent, since mobile service providers charge by the amount of data being sent.
System Requirements:
The application below shows an XT1211-000 current input module sampling a 4-20mA signal from a field transmitter and sending the data out over the Ethernet interface. Using i2o protocol, the XT1211’s inputs are mapped to an XT1531-000 at the far end which has 4-20mA outputs that connect to the analogue inputs of a DCS. The network interfaces are connected to cellular modems at each end so that the data can be transported over a long distance using the cellular network.
The application below shows an XT1211-000 current input module sampling a 4-20mA signal from a field transmitter and sending the data out over the Ethernet interface. Using i2o protocol, the XT1211’s inputs are mapped to an XT1531-000 at the far end which has 4-20mA outputs that connect to the analogue inputs of a DCS. The network interfaces are connected to cellular modems at each end so that the data can be transported over a long distance using the cellular network.
Featured Products:
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.
XT1531-000: 4-channel analogue current output, 4-channel digital I/O module, Modbus/TCP and i2o protocol.
Why Acromag:
Acromag is known in the Process industry for the accuracy and reliability of its products. Acromag’s Busworks XT series products support a variety of network protocols such as Modbus TCP/IP, Ethernet IP, Profinet, and i2o.
Acromag is known in the Process industry for the accuracy and reliability of its products. Acromag’s Busworks XT series products support a variety of network protocols such as Modbus TCP/IP, Ethernet IP, Profinet, and i2o.
Implementing the Solution:
On the i2o mapping page, the XT1211-000 input module is configured to map up to four of its analogue input channels to the four analogue output channels of the XT1531-000 output module. This configuration is shown below (only Channel 0 is shown)
On the i2o mapping page, the XT1211-000 input module is configured to map up to four of its analogue input channels to the four analogue output channels of the XT1531-000 output module. This configuration is shown below (only Channel 0 is shown)
By setting the output update rate to a relatively high value (in this case 5 minutes), the amount of data being sent is minimised. Also, by unchecking the “Keep target sockets open”, you are telling the XT1211 to only open the network connection when it’s ready to send data and then to close the connection. These settings will minimise network traffic and keep cellular data charges down.
For further information on this application, please do not hesitate to contact Metromatics on +61 7 3868 4255 or sales@metromatics.com.au
No comments:
Post a Comment