Rockwell Automation 57C329 Remote I/O Communications, AutoMax - Manual (Page 63)

4Ć1
4.0 PROGRAMMING
This section describes how the data is organized in the Remote I/O
module, Remote I/O Head, Remote Drive Interface Head, and Shark
Interface module, and provides examples of how the module is
accessed by the application software. For more detailed information
on programming, refer to the AutoMax Programming Reference
Binder.
4.1 Master Remote I/O Module Dual Port
Memory
The dualĆport memory in the master module contains an image of the
status of all the inputs and outputs on the digital and analog I/O
modules in the slave drops. Application tasks running on AutoMax
Processors in the master rack reference the I/O on the network in the
dual port. The master Remote I/O module manages the data in the
image area and communicates this data to the slave drops on the
Remote I/O network.
4.2 Register Organization
The dual port memory of the master module is divided into 8 image
areas, one for each drop and the master. Refer to Appendix I for
more detailed information on memory mapping. Drop 0 registers are
used for status and control in the master.
In the master all drop 0 registers are READ ONLY. Refer to figure 4.1
for drop 0 (Status) register assignments.
The master drop maintains status for all slave drops on the network.
The drop status bits (register 4) are TRUE or ON when the
corresponding drop is active. A FALSE or OFF state indicates that the
drop is either not present or has failed to communicate.
You can view this status information for the master Remote I/O
module using the I/O Monitor or S" (Status) command (see section
5) from the serial port. You can view status information for slave
Remote I/O modules or Heads using the S" (Status) command. You
cannot view status information for Shark drops.