ProSoft Technology inRAx MVI46-N2, Руководство пользователя

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Reference MVI46-N2 ♦ SLC Platform
Johnson Controls N2 Communication Module
ProSoft Technology, Inc. Page 45 of 68
October 27, 2008
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The following commands are recognized, and acknowledged, but are not
communicated in any way to the PLC/SLC, and do not return any data:
o
0/0: Time Update
o
0/8: Warm Start
o
All other commands return a Bad Command Error Code
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Configurable through the configuration file for the following:
o
Slave Address (assignable individually for Port 1 and 2)
o
Analog Input Object Count
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Binary Input Object Count
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Analog Output Object Count
o
Binary Output Object Count
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Warning and Alarming functions performed on Analog Input and Binary Input
data types
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Change of State Response buffering
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Communication status error codes and statistics returned per port
Memory mapping is pre-assigned to optimize data access and to ease
implementation
A port configured as a Johnson Controls N2 slave permits a remote master to
interact with data contained in the module. This data is derived from the SLC
processor.
5.2 Functional Overview
This section provides an overview of how the MVI46-N2 module transfers data
using the N2 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 discussion explains several concepts that are important for
understanding the operation of the MVI46-N2 module.
Module Power Up
On power up the module begins performing the following logical functions:
1 Initialize hardware components:
a Initialize SLC backplane driver.
b Test and clear all RAM.
c Initialize the serial communication ports.
2 Initialize module register space.
3 Enable slave driver on selected ports.
After the module is configured, the module begins receiving and transmitting
messages with Johnson Controls N2 devices on the network.