ProSoft Technology inRAx MVI56-CAS, Руководство пользователя

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Reference MVI56-CAS ♦ ControlLogix Platform
Teledyne CA Slave Module
ProSoft Technology, Inc. Page 49 of 86
December 26, 2007
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34: Setpoint select
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35: Setpoint operate
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43: Freeze meters
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44: Freeze analogs
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45: Freeze meters/analogs
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46/6: Special freeze
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50: Exception data request
ƒ Supports broadcast commands from master
ƒ Register addressing
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Status: Up to 250 words
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Analog: Up to 250 words
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Meter: Up to 125 values (2 words per value)
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Tank: Up to 250 words
ƒ Supports write commands from host
ƒ Operates in both direct or indirect modes
ƒ Setpoint select and operate
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Control point continuous and momentary
5.2 Functional Overview
This section provides an overview of how the MVI56-CAS module transfers data
using the CAS protocol. You should understand the important concepts in this
chapter before you begin installing and configuring the module.
5.2.1 General Concepts
The following topics describe several concepts that are important for
understanding the operation of the MVI56-CAS module.
On power up the module begins performing the following logical functions:
1
Initialize hardware components
2
Initialize ControlLogix backplane driver
3
Test and Clear all RAM
4
Initialize the serial communication ports
5
Wait for Module Configuration from ControlLogix processor
6
Initialize Module Register space
7
Enable Slave Driver on selected ports
After the module has received the Module Configuration Block from the
processor, the module will begin communicating with other nodes on the
network, depending on the configuration.