Rockwell Automation 57C329 Remote I/O Communications, AutoMax - Manual (Page 11)

1Ć3
Slave Drop Slave Drop Slave Drop
Master Drop
Remote I/O
Network B
R
I
O
R
I
O
P
Remote I/O
Network A
P Ć Processor Module
RIO Ć Remote I/O Communications Module
Figure 1.3 Ć Multiple Remote I/O Network Connections (Coax)
The master initiates and controls all data transmissions on the
network by polling every slave drop in a roundĆrobin sequence. A
slave drop's Remote I/O Communication module, Remote I/O Head,
or AutoMax Remote I/O Shark Interface module functions as an I/O
scanner: it reads data in from the input modules and writes data out
to the output modules. The data sent from the master drop to the
slave updates the status of the slave's outputs. The slave drop sends
the current status of its inputs back to the master.
Each Remote I/O Communications module contains a 4K word
dualĆport memory for storing the data that is transmitted over the
network. DualĆport memory is accessible to both the module and the
AutoMax Processor in the rack. In the master module, the dualĆport
memory contains an image of the status of all the inputs and outputs
of the I/O modules in the slave drops. The application task that
controls the I/O associated with these I/O modules actually examines
the inputs and controls the outputs in the image area.
The Remote I/O Communications module provides an RSĆ232
compatible serial port and the associated software needed to monitor
the status of the drops. An ASCII terminal or a personal computer
running terminalĆemulation software are also required. For more
information, refer to section 5.0.
The remainder of this manual describes the functions and
specifications of the Remote I/O Communications module, Remote
I/O Head, Remote Drive Interface Head, and the AutoMax Remote I/O
Shark Interface module. It also includes installation and
troubleshooting procedures, as well as configuration and
programming information.