Data Exchange

Data Exchange with the STB NIP 2212

Introduction Data exchange between a Modbus over TCP/IP host or the HTTP embedded web server and the Advantys STB island bus is conducted over the Ethernet port on the STB NIP 2212.

Master Devices The input and output data image areas (See The Island’s Process Image Blocks, p. 168) can be accessed and monitored over the Ethernet LAN by a

Modbus over TCP/IP fieldbus master or the STB NIP 2212 HTTP embedded web server.

The Ethernet port on the STB NIP 2212 is configured as follows: Port 502 SAP—Modbus over TCP/IP

￿Port 80 SAP—HTTP Port 161 SAP—SNMP

Note: An HMI panel or a device running the Advantys configuration software can also exchange data with an island via the CFG port (See The CFG Interface, p. 33) on the STB NIP 2212.

Modbus over

Master devices use Modbus messaging (See List of Supported Commands, p. 135)

TCP/IP

to read and write data to specific registers in the process image. The Modbus

Communications

protocol is understood regardless of the network type.

 

The Modbus protocol uses a 16-bit word data format.

 

 

Data Exchange

Data stored in the process image is exchanged between the STB NIP 2212 and the

Process

Ethernet network via Modbus over TCP/IP. First, data from the Ethernet host is

 

written to the output data image area (See The Output Data Process Image, p. 119)

 

in the NIM’s process image. Then, status, echo output, and input data information

 

from the I/O modules on the island are placed in the input data image area (See The

 

Input Data and I/O Status Process Image, p. 120). In this location, the Modbus

 

master can access them over the TCP/IP network, or over the CFG port.

 

Data within the output and the input areas of the process image is organized in the

 

order that the I/O modules are assembled (See A Data Exchange Example, p. 118)

 

on the island bus.

 

 

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890USE17700 April 2004

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Schneider Electric 890USE17700 manual Data Exchange with the STB NIP, Process
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890USE17700 specifications

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