Rockwell Automation 1791D-XXXX CompactBlock I/O for DeviceNet Modules Series D I.I. - Manual (Page 15)

CompactBlock I/O for DeviceNet Modules Series D 15
Publication 1791D-IN003A-EN-P - June 2003
Insert the Terminal Block
To insert the CompactBlock terminal block.
1. Insert the terminal block by aligning it and pushing it back
until it rests against the back of the module.
2. Tighten the screws on each side of the terminal block until the
terminal block is firmly in place.
Communicate With the 1791D Module
Determine the Baud Rate for Your DeviceNet Connection
All 1791D CompactBlock I/O for DeviceNet modules contain the
autobaud feature. Autobaud lets the modules automatically detect the
baud rate for the network upon connection to the live network.
The 1791D base modules’ I/O is exchanged with the master through
a polled, cyclic or change of state connection.
Polled - master initiates communication by sending its polled I/O
message to the 1791D module. The module consumes the message,
updates any outputs, and produces a response. If inputs are present,
the response contains the input data.
Cyclic - allows configuration of the block as an I/O client. The block
will produce and consume its I/O cyclically at the rate configured.
Change of state - production occurs when an input changes. If no
input change occurs within the expected packet time, a heartbeat
production occurs. This heartbeat production tells the scanner
module that the 1791D I/O module is alive and ready to
communicate. Consumption occurs when data changes and the
master produces new output data to the I/O block.