ABB EK370-40-11 SK827040-AL 220-230V Contactor

MODBUS TCP

MODBUS TCP is a MODBUS RTU message transmitted with a TCP/IP wrapper and sent

over an Ethernet network instead of serial lines. The Server does not have a SlaveID as

in RTU since it uses an IP Address instead.

MPS III Fan System Monitoring and Cooling Manufacturers ABB,

Bailey Model(s) ABB Bailey Infi 90, ABB Bailey Infi 90 and Net 90

Estimated Shipping Size Dimensions: 19.0" x 2.0" x 13.0" (48.3 cm x 5.1 cm x 33.0 cm)

Weight: 11 lbs 7.7 oz (5.2kg )

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800xA for Symphony Plus Harmony communicates with the control systems  through a

Cnet-to-computer interface (IET800. PNI800).

800xA for Symphony Plus Harmony is a distributed process management and  control system.

Using a series of integrated Harmony control units, the system  allows monitoring and control

of process variables such as flow rate,

temperature,  and pressure according to a control configuration that the engineer or technician  defines.

A Harmony control unit is a controller and its I/O devices connected for  communication on control network (Cnet).

800xA for Symphony Plus Harmony operates in a Windows environment on  personal computer hardware.

Using interactive process graphics, the operator can  monitor and control all Analog loops and Digital devices

interfaced to the network  through Harmony control units.

800xA for Symphony Plus Harmony provides maintenance personnel with the  capability to globally monitor

the operating status of any system component on the  network, and to diagnose component failures from any workstation.

800xA for Symphony Plus Harmony also provides the Harmony Executive Service.

It is an 800xA service that controls underlying 800xA for Symphony Plus Harmony  services.

The AO820 Analog Output Module has 4 bipolar analog output

channels. The choice of current or voltage output is configurable for

each channel. There are separate sets of terminals for voltage and

current outputs, and it is up to the user to wire outputs properly. The

only differences between current or voltage channel configuration is

in software settings.

To supervise the communication to the A/D-converters the output    

data is read back and verified. The opencircuit diagnostics are read

continuously as wel. The process voltage supervision input give

channel error signals if the voltage disappears. The error signal can

be read via the ModuleBus.

MODBUS RTU

MODBUS RTU is a non-proprietary serial communications protocol that is widely used in

the process control industry. The protocol was developed by Modicon for PLC

communications and later released for public use.

This protocol is available in all major Human Machine Interface (HMI) software packages

and terminals. Many of the major controller and PLC manufacturers also offer MODBUS

protocol as a standard or optional protocol in their instrumentation.

The hardware over which MODBUS RTU communications are performed is not defined

by the protocol. MODBUS RTU is supported on RS-232, RS-422, RS-485, Ethernet and

other electrical standards. It should be noted that MODBUS RTU, MODBUS ASCII and

MODBUS Plus are unique communication formats, and are not compatible with each

other. This document will discuss MODBUS RTU only.