This material describes the Momentum170ENT11002, an adapter that can be connected to any Momentum I/O base to create a functional I/O module. The Momentum 170ENT11002 is a direct replacement for the Momentum 170ENT11000.

This adapter is installed on any Momentum I/O base to form a complete I/O module that communicates on an Ethernet network. The module provides direct connection to the Ethernet network, enabling an Ethernet host to communicate with field devices wired to the I/O base terminals. A programmable controller or other host device on the network can then read from the input terminals and write to the output terminals of the I/O base.

The adapter communicates with host devices using Modbus Application Protocol with TCP/IP packets. It supports both Ethernet II and IEEE802.3SNAP framing.

For information about using Modbus Application Protocol with TCP/IP, refer to the Ethernet TCP/IP Module User Guide (840USE107). Details of the Modbus protocol are provided in the Modbus Protocol Reference Guide (PI MBUS 300).

For information about the application and field wiring of I/O bases, refer to the Momentum I/O Bases User Manual (870USE002).

Each adapter connects to the internal communication connector of its I/O base. Clips lock the adapter in place and can be released with a common screwdriver to remove the adapter. Ground screw can be used to provide an enhanced grounding system. The user can fill out the front panel wiring label (supplied with the I/O base) to identify the wiring connections at the I/O base terminals.

The adapter is considered open equipment and must be mounted in an enclosure that is approved for the site at which it is installed.

Power for the adapter and I/O base is provided by the user at the field location. The adapter receives its operating voltage through its I/O base internal connection. The adapter monitors its voltage and goes off line to the network if the voltage is not with in tolerance.

Data is mapped between the application and I/O base field terminals in the IEC format. Refer to the Momentum I/O Bases User Manual (870USE002) for the mapping diagrams for the I/O bases.

To ensure deterministic timing of I/O messages, you should design your network to include only your application host and your I/O base communication adapters. Adding other kinds of devices, such as user interfaces or programmers, can cause variables in I/O message timing when those devices access the network.