Siemens SIMATIC TI500 Manual do Utilizador descarregar pdf (Página 16)

Product Overview

1-4

TIWAY I Gateway User Manual

Basic Operating Features (continued)

The

Gateway provides protocol and electrical interface conversion. A

command issued by the host system is transmitted to the Gateway

. Once it

receives the command, the Gateway converts the protocol and electrical

signals and then relays the command to the PLC which was addressed.

After the PLC responds, the Gateway re-translates the information and

sends it back to the host system through the interface device.

The primary function of the Gateway

, then, is to translate host commands

into TIW

Y I commands. These commands are described in Appendix C.

The TIW

Y I Gateway supports data transmission rates from 1

10 bits per

second (bps) to 19.2 kbps with the host, and from 1

10 bps to 1

15.2 kbps on

the network interface. T

able 1-1 summarizes the baud rates supported by

the Foxboro, Honeywell, and Fisher host systems.

able 1-1

Data T

ransmission Rates Supported

Host System Data Transmission Rates Supported

110 150 300 600 1200 2400 4800 9600 19.2k

Foxboro

      

Honeywell

 

Fisher

      

The

Gateway allows access to discrete I/O points and Control Relays

(X, Y

, and C), holding registers (V

-memory), word input and output registers

(WX and WY), as well as performance statistics for each PLC network

interface. Information can be stored in variable (V) memory locations,

retrieved, and changed from the operator

’

s console of the distributed control

system. Appendix A provides information on the maximum numbers of

discrete inputs and outputs, holding registers, and word input registers.

Examples of data retrieval include the following:

•

If you want to retrieve a process control loop integer value from a PLC,

move this value into a register

, or V

-memory location, corresponding to

the one configured in the distributed control system (refer to the

appropriate DCS manuals).

•

If you want to look at the current value of a counter

, move this value

into V

-memory (using the ladder logic program) to a location configured

as a register in the host system.

Discrete inputs and outputs (Xs, Ys, and Cs) generally do not require special

conditioning in order to be read from the operator

’

s console (as in the Fisher

PROVOX system). See Appendix D for examples.

Translating

Commands

between Host and

PLC Network

Data T

ransmission

Rates Supported

ypes of Data

Accessed

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 93 94

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