Fieldbus & Industrial Networking


New remote I/O modules with built-in network ports

September 2005 Fieldbus & Industrial Networking

The new Acromag range of EtherNet/IP and Modbus TCP/IP I/O modules, have a built-in network port eliminating the space and expense of a bus-coupler unit. The Ethernet/IP modules interface up to 12 analog or discrete I/O signals directly to an EtherNet/IP network. Since each remote I/O module has its own Ethernet port, it can operate independently of a bus-coupler or controller that typically handles network communication for modular block I/O systems. Without those expensive communication devices, Acromag's I/O modules are able to deliver a more cost and space-efficient solution. No software is required as the set-up uses a standard Internet browser to configure an embedded web page. A complete 12-channel I/O solution would need only 25 mm of DIN rail space. The I/O modules provide an isolated EtherNet/IP 10/100 Mbps network interface. To ensure interoperability, the units have passed the internationally recognised EtherNet/IP conformance tests established by the ODVA (Open DeviceNet Vendors Association). They are among the first I/O modules to receive this certification. Modbus TCP/IP versions are also available.

Three I/O module types are available. The discrete I/O modules are suitable for ON/OFF monitoring and control of industrial devices. Analog input modules convert DC voltage, current or temperature signals from sensors to the network. Analog output modules provide DC current or voltage control signals for displays, drives, or other analog devices.

All Ethernet units have three-way 1,5 kV AC isolation separating the I/O, network and power circuits to prevent damage from surges and ground loops. An internal microcontroller processes the I/O signals and directs all operations. Built-in watchdog timers continuously monitor network communications while self-diagnostic routines simplify maintenance and troubleshooting. A failsafe mode can also be set to ensure outputs are sent to a safe state if a failure occurs. LEDs indicate power, network activity, and individual channel status. Discrete I/O is offered on three models with a choice of 12 input channels, 12 output channels, or 12 individually selectable bi-directional input/output channels. Analog output models provide 0/4 to 20 mA DC current output or 0 to 10 V d.c. voltage output signals. A range of Ethernet switches, Profibus and LONWorks I/O modules are also available.



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