DESCRIPTION AND OPERATION
INNPM11 NETWORK PROCESSING MODULE
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WBPEEUI250016A1
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INNPM11 NETWORK PROCESSING MODULE
The NPM module holds the exception report routing database
and directs the operation of the process control unit interface.
It acts as the translator between the INFI-NET loop and the
Controlway. It communicates directly to the NIS module on the
I/O expander bus. Communication to all control modules
within a process control unit is over the Controlway.
Exception Reports
The NPM module polls the control modules within the process
control unit for exception reports. Process control unit control
modules generate an exception report when:
•
A designated point changes by a significant amount.
•
The maximum time expires.
•
An alarm condition changes.
The NPM module polls all modules for exception reports. The
poll rate is selected through a dipswitch setting on the NPM
circuit board. The NPM module has poll rates of one, two, four
or eight polls per second.
Data Transfer
Data transfer between the NPM module and the NIS module
occurs over the I/O expander bus. The NPM module is respon-
sible for:
•
Writing commands to the NIS module.
•
Requesting NIS module status.
•
Writing data to the NIS module.
•
Reading data from the NIS module.
The NPM module always initiates a data transfer.
